TY  - JOUR
AU  - Tanasković, Jovan
AU  - Franklin, F.
AU  - Mitrović, A.
AU  - Disić, A.
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3583
AB  - The aim of this research work is investigations of absorption characteristics of a circular seamless tube collision absorber filled by rigid polyurethane (PU) foam under axial load. Shrinking of circular tube passing through cone bushing starts after absorber is activated at the moment of collision. The energy absorption realises in three ways: elastic-plastic deformation of the tube wall, friction between absorption elements and compression the rigid PU foam inside the tube. Using rigid PU foam, as the seamless tube filler, in the process of collision energy absorption increases absorption power in comparing to with only empty tube, as well as gives gradual increases of deformation resistance during deformation process. Experimental research was prepared and realized in the laboratory using the scaled samples. The effect of rigid PU foam, configuration of absorber filled by PU foam on the absorption power and manufacturing technology of the samples, are considered and discussed in this paper. The results indicate that the shrinking foam filled tube absorber has for about 18% bigger absorption power than the empty one. Formation of numerical model and numerical analyses of shrinking foam filled tube absorber were realized using ANSYS software package. Force vs. stroke (F(s)) diagrams obtained by tests and numerical analyses are in a good correlation which confirms formed numerical model as a suitable for further quasi-static analyses and for dimensioning the similar types of absorber.
PB  - Sage Publications Ltd, London
T2  - Proceedings of The Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit
T1  - Experimental research of absorption properties of rigid foam filled circular seamless tube energy absorber under quasi-static axial load
EP  - 992
IS  - 8
SP  - 982
VL  - 235
DO  - 10.1177/0954409720976034
ER  - 

@article{
author = "Tanasković, Jovan and Franklin, F. and Mitrović, A. and Disić, A.",
year = "2021",
abstract = "The aim of this research work is investigations of absorption characteristics of a circular seamless tube collision absorber filled by rigid polyurethane (PU) foam under axial load. Shrinking of circular tube passing through cone bushing starts after absorber is activated at the moment of collision. The energy absorption realises in three ways: elastic-plastic deformation of the tube wall, friction between absorption elements and compression the rigid PU foam inside the tube. Using rigid PU foam, as the seamless tube filler, in the process of collision energy absorption increases absorption power in comparing to with only empty tube, as well as gives gradual increases of deformation resistance during deformation process. Experimental research was prepared and realized in the laboratory using the scaled samples. The effect of rigid PU foam, configuration of absorber filled by PU foam on the absorption power and manufacturing technology of the samples, are considered and discussed in this paper. The results indicate that the shrinking foam filled tube absorber has for about 18% bigger absorption power than the empty one. Formation of numerical model and numerical analyses of shrinking foam filled tube absorber were realized using ANSYS software package. Force vs. stroke (F(s)) diagrams obtained by tests and numerical analyses are in a good correlation which confirms formed numerical model as a suitable for further quasi-static analyses and for dimensioning the similar types of absorber.",
publisher = "Sage Publications Ltd, London",
journal = "Proceedings of The Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit",
title = "Experimental research of absorption properties of rigid foam filled circular seamless tube energy absorber under quasi-static axial load",
pages = "992-982",
number = "8",
volume = "235",
doi = "10.1177/0954409720976034"
}

Tanasković, J., Franklin, F., Mitrović, A.,& Disić, A.. (2021). Experimental research of absorption properties of rigid foam filled circular seamless tube energy absorber under quasi-static axial load. in Proceedings of The Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit
Sage Publications Ltd, London., 235(8), 982-992.
https://doi.org/10.1177/0954409720976034

Tanasković J, Franklin F, Mitrović A, Disić A. Experimental research of absorption properties of rigid foam filled circular seamless tube energy absorber under quasi-static axial load. in Proceedings of The Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit. 2021;235(8):982-992.
doi:10.1177/0954409720976034 .

Tanasković, Jovan, Franklin, F., Mitrović, A., Disić, A., "Experimental research of absorption properties of rigid foam filled circular seamless tube energy absorber under quasi-static axial load" in Proceedings of The Institution of Mechanical Engineers Part F-Journal of Rail and Rapid Transit, 235, no. 8 (2021):982-992,
https://doi.org/10.1177/0954409720976034 . .

TY  - CHAP
AU  - Mitrović, Nenad
AU  - Mitrović, A.
AU  - Reljić, M.
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3676
AB  - Medical textile plays an important role in the technical textiles sector as one of the most rapidly growing sectors in the technical textile market. The textile materials should have some adequate mechanical properties to be useful as medical textile. Tensile strength presents one of the basic mechanical properties used to describe textile specimens. Standardized tensile testing procedures on textile specimens were commonly used in the past. The aim of this paper was to measure in-plane strain field on the tensile medical textile specimen using 2D Digital Image Correlation method (2D-DIC). 2D-DIC is a non-contact optical method for accurate displacement and strain full-field measurement. In this study, two medical cotton textiles, with density 120 and 130 g/m2, were used to create three specimens for each material. Each specimen was placed in the tensile testing machine and measured until the break. During the tensile testing, camera was automatically recording full-field displacement in X and Y directions. Textile 1 and Textile 2 showed significant differences in point distance values, despite the small deviation in densities (less than 10%). Mean value of the elongation for Textile 1 is more than a double than the elongation for Textile 2, although the difference for mean value of Maximum force if negligible. Also, it has been showed that 2D-DIC can play significant role for measurement in textile mechanical properties measurement.
PB  - Springer
T2  - Lecture Notes in Networks and Systems
T1  - Strain measurement of medical textile using 2d digital image correlation method
EP  - 464
SP  - 447
VL  - 153
DO  - 10.1007/978-3-030-58362-0_26
ER  - 

@inbook{
author = "Mitrović, Nenad and Mitrović, A. and Reljić, M.",
year = "2021",
abstract = "Medical textile plays an important role in the technical textiles sector as one of the most rapidly growing sectors in the technical textile market. The textile materials should have some adequate mechanical properties to be useful as medical textile. Tensile strength presents one of the basic mechanical properties used to describe textile specimens. Standardized tensile testing procedures on textile specimens were commonly used in the past. The aim of this paper was to measure in-plane strain field on the tensile medical textile specimen using 2D Digital Image Correlation method (2D-DIC). 2D-DIC is a non-contact optical method for accurate displacement and strain full-field measurement. In this study, two medical cotton textiles, with density 120 and 130 g/m2, were used to create three specimens for each material. Each specimen was placed in the tensile testing machine and measured until the break. During the tensile testing, camera was automatically recording full-field displacement in X and Y directions. Textile 1 and Textile 2 showed significant differences in point distance values, despite the small deviation in densities (less than 10%). Mean value of the elongation for Textile 1 is more than a double than the elongation for Textile 2, although the difference for mean value of Maximum force if negligible. Also, it has been showed that 2D-DIC can play significant role for measurement in textile mechanical properties measurement.",
publisher = "Springer",
journal = "Lecture Notes in Networks and Systems",
booktitle = "Strain measurement of medical textile using 2d digital image correlation method",
pages = "464-447",
volume = "153",
doi = "10.1007/978-3-030-58362-0_26"
}

Mitrović, N., Mitrović, A.,& Reljić, M.. (2021). Strain measurement of medical textile using 2d digital image correlation method. in Lecture Notes in Networks and Systems
Springer., 153, 447-464.
https://doi.org/10.1007/978-3-030-58362-0_26

Mitrović N, Mitrović A, Reljić M. Strain measurement of medical textile using 2d digital image correlation method. in Lecture Notes in Networks and Systems. 2021;153:447-464.
doi:10.1007/978-3-030-58362-0_26 .

Mitrović, Nenad, Mitrović, A., Reljić, M., "Strain measurement of medical textile using 2d digital image correlation method" in Lecture Notes in Networks and Systems, 153 (2021):447-464,
https://doi.org/10.1007/978-3-030-58362-0_26 . .

TY  - CONF
AU  - Mitrović, Aleksandra
AU  - Mitrović, Nenad
AU  - Maslarević, Aleksandar
AU  - Adžić, Vuk M.
AU  - Popović, Dejana
AU  - Milošević, Miloš
AU  - Antonović, Dušan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3227
AB  - One of the main objectives in research and development of resin based cements (RBCs) is to enhance their clinical longevity and ease of use. In spite of the undeniable technological advances introduced in the last few decades, the polymerization shrinkage i.e. strain that accompanies the chain-growth polymerization of dimethacrylate monomers remains one of the major concerns for the clinical performance of composite restorations. Also, RBCs can produce a considerable amount of heat, due to the light energy from the curing lights and exothermic reaction of polymerization. The purpose of this study was to determine the temperature changes during the photo-polymerization using thermocouples and to measure strain field of the self-etching, self-adhesive RBC, Maxcem Elite (Kerr, Orange, CA, USA) (empty set5 x 1 mm - Group I and empty set5 x 2 mm - Group II) using experimental technique, 3D Digital Image Correlation (DIC) method. Digital images were recorded immediately after photo-polymerization of the samples with a LED-curing unit for 20 s, according to manufacturer's recommendation. Vickers microhardness was determined after photo-polymerization and after 24 h. Temperature curves for both groups indicated similar patterns but the peak temperature of Group II was significantly higher compared to peak temperature of Group I. DIC showed that peripheral zone of the samples had the highest strain values in both groups. Group I indicated significantly higher values of hardness. All the results were material-dependent and probably correlated to the composition of each material, which is not fully disclosed by the manufacturers.
PB  - Springer International Publishing Ag, Cham
C3  - Experimental and Numerical Investigations in Materials Science and Engineering
T1  - Thermal and Mechanical Characteristics of Dual Cure Self-etching, Self-adhesive Resin Based Cement
EP  - 15
SP  - 3
VL  - 54
DO  - 10.1007/978-3-319-99620-2_1
ER  - 

@conference{
author = "Mitrović, Aleksandra and Mitrović, Nenad and Maslarević, Aleksandar and Adžić, Vuk M. and Popović, Dejana and Milošević, Miloš and Antonović, Dušan",
year = "2019",
abstract = "One of the main objectives in research and development of resin based cements (RBCs) is to enhance their clinical longevity and ease of use. In spite of the undeniable technological advances introduced in the last few decades, the polymerization shrinkage i.e. strain that accompanies the chain-growth polymerization of dimethacrylate monomers remains one of the major concerns for the clinical performance of composite restorations. Also, RBCs can produce a considerable amount of heat, due to the light energy from the curing lights and exothermic reaction of polymerization. The purpose of this study was to determine the temperature changes during the photo-polymerization using thermocouples and to measure strain field of the self-etching, self-adhesive RBC, Maxcem Elite (Kerr, Orange, CA, USA) (empty set5 x 1 mm - Group I and empty set5 x 2 mm - Group II) using experimental technique, 3D Digital Image Correlation (DIC) method. Digital images were recorded immediately after photo-polymerization of the samples with a LED-curing unit for 20 s, according to manufacturer's recommendation. Vickers microhardness was determined after photo-polymerization and after 24 h. Temperature curves for both groups indicated similar patterns but the peak temperature of Group II was significantly higher compared to peak temperature of Group I. DIC showed that peripheral zone of the samples had the highest strain values in both groups. Group I indicated significantly higher values of hardness. All the results were material-dependent and probably correlated to the composition of each material, which is not fully disclosed by the manufacturers.",
publisher = "Springer International Publishing Ag, Cham",
journal = "Experimental and Numerical Investigations in Materials Science and Engineering",
title = "Thermal and Mechanical Characteristics of Dual Cure Self-etching, Self-adhesive Resin Based Cement",
pages = "15-3",
volume = "54",
doi = "10.1007/978-3-319-99620-2_1"
}

Mitrović, A., Mitrović, N., Maslarević, A., Adžić, V. M., Popović, D., Milošević, M.,& Antonović, D.. (2019). Thermal and Mechanical Characteristics of Dual Cure Self-etching, Self-adhesive Resin Based Cement. in Experimental and Numerical Investigations in Materials Science and Engineering
Springer International Publishing Ag, Cham., 54, 3-15.
https://doi.org/10.1007/978-3-319-99620-2_1

Mitrović A, Mitrović N, Maslarević A, Adžić VM, Popović D, Milošević M, Antonović D. Thermal and Mechanical Characteristics of Dual Cure Self-etching, Self-adhesive Resin Based Cement. in Experimental and Numerical Investigations in Materials Science and Engineering. 2019;54:3-15.
doi:10.1007/978-3-319-99620-2_1 .

Mitrović, Aleksandra, Mitrović, Nenad, Maslarević, Aleksandar, Adžić, Vuk M., Popović, Dejana, Milošević, Miloš, Antonović, Dušan, "Thermal and Mechanical Characteristics of Dual Cure Self-etching, Self-adhesive Resin Based Cement" in Experimental and Numerical Investigations in Materials Science and Engineering, 54 (2019):3-15,
https://doi.org/10.1007/978-3-319-99620-2_1 . .

TY  - CHAP
AU  - Mitrović, Aleksandra
AU  - Stamenković, Dragomir
AU  - Popović, Dejana
AU  - Dragičević, Aleksandra
PY  - 2019
UR  - https://link.springer.com/chapter/10.1007/978-3-030-30853-7_11
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5843
AB  - Hydrogels have peculiar physical and chemical properties and therefore, are used in a variety of biomedical applications including drug delivery agents, prosthetic devices, the repair and replacement of soft tissues, contact lenses, etc. Consequently, investigation of mechanical, physical and chemical properties is crucial in biomedical application of hydrogels. Poly (2-hydroxyethyl methacrylate) (pHEMA), as a biocompatible hydrogel, was first hydrogel used for making soft contact lenses. Many researches have been modified pHEMA with the aim of improving its properties. Application of nanotechnology is one of the possible solutions for improving the characteristics of this biocompatible hydrogel. In this paper, polyhydroxyethyl methacrylate was used as standard material for soft contact lenses (SL 38). This material was incorporated with fullerene C60 (SL38-A), fullerol C60(OH)24 (SL 38-B) and fullerene metformin hydroxylate C60(OH)12(OC4N5H10)12 (SL 38-C), respectively. Three new nanophotonic soft contact lenses were made. The main goal of this research was to develop appropriate process parameters for soft contact lens micro-turning. Also, studying the thermal decomposition of standard soft contact lens, pHEMA, as well as three new nanophotonic soft contact lenses was one of the main objectives. Results have shown that manufacturing process of nanofotonic soft contact lens is considered to be a micro-turning process regarding the cutting depth and tool nose ratio. Thermal stability of all three nanofotonic soft contact lenses was significantly improved comparing to the standard soft contact lens. Still, further research needs to be done so these nonophotonic soft contact lenses could find practical application in the field of biomedical engineering.
PB  - © Springer Nature Switzerland AG 2020
T2  - Computational and Experimental Approaches in Materials Science and Engineering. CNNTech 2018. Lecture Notes in Networks and Systems
T1  - Manufacturing Process and Thermal Stability of Nanophotonic Soft Contact Lenses
EP  - 199
SP  - 184
VL  - 90
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5843
ER  - 

@inbook{
author = "Mitrović, Aleksandra and Stamenković, Dragomir and Popović, Dejana and Dragičević, Aleksandra",
year = "2019",
abstract = "Hydrogels have peculiar physical and chemical properties and therefore, are used in a variety of biomedical applications including drug delivery agents, prosthetic devices, the repair and replacement of soft tissues, contact lenses, etc. Consequently, investigation of mechanical, physical and chemical properties is crucial in biomedical application of hydrogels. Poly (2-hydroxyethyl methacrylate) (pHEMA), as a biocompatible hydrogel, was first hydrogel used for making soft contact lenses. Many researches have been modified pHEMA with the aim of improving its properties. Application of nanotechnology is one of the possible solutions for improving the characteristics of this biocompatible hydrogel. In this paper, polyhydroxyethyl methacrylate was used as standard material for soft contact lenses (SL 38). This material was incorporated with fullerene C60 (SL38-A), fullerol C60(OH)24 (SL 38-B) and fullerene metformin hydroxylate C60(OH)12(OC4N5H10)12 (SL 38-C), respectively. Three new nanophotonic soft contact lenses were made. The main goal of this research was to develop appropriate process parameters for soft contact lens micro-turning. Also, studying the thermal decomposition of standard soft contact lens, pHEMA, as well as three new nanophotonic soft contact lenses was one of the main objectives. Results have shown that manufacturing process of nanofotonic soft contact lens is considered to be a micro-turning process regarding the cutting depth and tool nose ratio. Thermal stability of all three nanofotonic soft contact lenses was significantly improved comparing to the standard soft contact lens. Still, further research needs to be done so these nonophotonic soft contact lenses could find practical application in the field of biomedical engineering.",
publisher = "© Springer Nature Switzerland AG 2020",
journal = "Computational and Experimental Approaches in Materials Science and Engineering. CNNTech 2018. Lecture Notes in Networks and Systems",
booktitle = "Manufacturing Process and Thermal Stability of Nanophotonic Soft Contact Lenses",
pages = "199-184",
volume = "90",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5843"
}

Mitrović, A., Stamenković, D., Popović, D.,& Dragičević, A.. (2019). Manufacturing Process and Thermal Stability of Nanophotonic Soft Contact Lenses. in Computational and Experimental Approaches in Materials Science and Engineering. CNNTech 2018. Lecture Notes in Networks and Systems
© Springer Nature Switzerland AG 2020., 90, 184-199.
https://hdl.handle.net/21.15107/rcub_machinery_5843

Mitrović A, Stamenković D, Popović D, Dragičević A. Manufacturing Process and Thermal Stability of Nanophotonic Soft Contact Lenses. in Computational and Experimental Approaches in Materials Science and Engineering. CNNTech 2018. Lecture Notes in Networks and Systems. 2019;90:184-199.
https://hdl.handle.net/21.15107/rcub_machinery_5843 .

Mitrović, Aleksandra, Stamenković, Dragomir, Popović, Dejana, Dragičević, Aleksandra, "Manufacturing Process and Thermal Stability of Nanophotonic Soft Contact Lenses" in Computational and Experimental Approaches in Materials Science and Engineering. CNNTech 2018. Lecture Notes in Networks and Systems, 90 (2019):184-199,
https://hdl.handle.net/21.15107/rcub_machinery_5843 .

TY  - JOUR
AU  - Mitrović, Aleksandra
AU  - Mitrović, Nenad
AU  - Tanasić, Ivan
AU  - Milošević, Miloš
AU  - Antonović, Dušan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3210
AB  - Extensive evolution of glass ionomer cements (GIC) has marked a significant shift in the practice of luting indirect dental restorations limiting the use of zinc-phosphate and zinc-polycarboxylate cements to a few indications. GIC are now one of the materials of choice for cementation of all ceramics, fiber reinforced composite posts and veneers. GICs are determined by unique properties like chemical adhesion to tooth and base metals, low thermal expansion coefficients similar to dentin and minimal microleakage at the tooth-enamel interface due to low shrinkage. Shrinkage strain is identified as the cause, and the associated stress as the mechanism for the loss of marginal adaption and cohesive fracture within the material. The aim of this study is to measure the strain and displacement field in a conventional GIC (Riva Luting, SDI, Australia) related to different cement diameter, using 3D Digital Image Correlation (DIC) method. The experiment is done for samples with thickness of 1 mm combined with diameters of 4 mm (Group I) and 3 mm (Group II). The strain field is measured using 3D 11optical system Aramis 2M (GOM, Braunschweig, Germany). This study provides valuable data about strain behaviour and displacement as a possible failure factor in GIC, Riva Luting. Visible differences between Group I and Group II were observed.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Strain field measurements of glass ionomer cement
EP  - 147
IS  - 2
SP  - 143
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3210
ER  - 

@article{
author = "Mitrović, Aleksandra and Mitrović, Nenad and Tanasić, Ivan and Milošević, Miloš and Antonović, Dušan",
year = "2019",
abstract = "Extensive evolution of glass ionomer cements (GIC) has marked a significant shift in the practice of luting indirect dental restorations limiting the use of zinc-phosphate and zinc-polycarboxylate cements to a few indications. GIC are now one of the materials of choice for cementation of all ceramics, fiber reinforced composite posts and veneers. GICs are determined by unique properties like chemical adhesion to tooth and base metals, low thermal expansion coefficients similar to dentin and minimal microleakage at the tooth-enamel interface due to low shrinkage. Shrinkage strain is identified as the cause, and the associated stress as the mechanism for the loss of marginal adaption and cohesive fracture within the material. The aim of this study is to measure the strain and displacement field in a conventional GIC (Riva Luting, SDI, Australia) related to different cement diameter, using 3D Digital Image Correlation (DIC) method. The experiment is done for samples with thickness of 1 mm combined with diameters of 4 mm (Group I) and 3 mm (Group II). The strain field is measured using 3D 11optical system Aramis 2M (GOM, Braunschweig, Germany). This study provides valuable data about strain behaviour and displacement as a possible failure factor in GIC, Riva Luting. Visible differences between Group I and Group II were observed.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Strain field measurements of glass ionomer cement",
pages = "147-143",
number = "2",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3210"
}

Mitrović, A., Mitrović, N., Tanasić, I., Milošević, M.,& Antonović, D.. (2019). Strain field measurements of glass ionomer cement. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 19(2), 143-147.
https://hdl.handle.net/21.15107/rcub_machinery_3210

Mitrović A, Mitrović N, Tanasić I, Milošević M, Antonović D. Strain field measurements of glass ionomer cement. in Structural Integrity and Life. 2019;19(2):143-147.
https://hdl.handle.net/21.15107/rcub_machinery_3210 .

Mitrović, Aleksandra, Mitrović, Nenad, Tanasić, Ivan, Milošević, Miloš, Antonović, Dušan, "Strain field measurements of glass ionomer cement" in Structural Integrity and Life, 19, no. 2 (2019):143-147,
https://hdl.handle.net/21.15107/rcub_machinery_3210 .

TY  - JOUR
AU  - Mitrović, Aleksandra
AU  - Antonović, Dušan
AU  - Tanasić, Ivan
AU  - Mitrović, Nenad
AU  - Bakić, Gordana
AU  - Popović, Dejana
AU  - Milošević, Miloš
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3069
AB  - The introduction of resin-based cements and an adhesive-bonding system in daily dental practice has given the opportunity to increase the retention of previously conventional cemented restorations and the optimal results in esthetic. This experimental study employed the 3D Digital Image Correlation Method (3D-DIC) for detecting shrinkage strain in four dual cured composite cements. The aim was to visualize measure, analyze, and compare strain fields in four resin-based cements using the 3D-DIC method. A total of 72 samples were divided into 4 groups considering variations in sample types, diameter, and thickness. Four types of composite cements: RelyX U200 (3 M ESPE, St. Paul, MN, USA), MaxCem Elite (Kerr, Orange, CA, USA), Multilink Automix (Ivoclar Vivadent, Schaan, Liechtenstein), and SeT PP (SDI, Australia) were used. Each type had diameters of 3 mm, 4 mm, and 5 mm, respectively, combined with two different values of thickness: 1 mm and 2 mm. Thickness had an important role on strain detected in all tested materials showing higher strain in samples with 2 mm thickness compared to 1 mm samples. Shrinkage strain values were the highest in Set PP samples indicated the possibility of undesirable de-bonding.
PB  - Hindawi Ltd, London
T2  - Biomed Research International
T1  - 3D Digital Image Correlation Analysis of the Shrinkage Strain in Four Dual Cure Composite Cements
VL  - 2019
DO  - 10.1155/2019/2041348
ER  - 

@article{
author = "Mitrović, Aleksandra and Antonović, Dušan and Tanasić, Ivan and Mitrović, Nenad and Bakić, Gordana and Popović, Dejana and Milošević, Miloš",
year = "2019",
abstract = "The introduction of resin-based cements and an adhesive-bonding system in daily dental practice has given the opportunity to increase the retention of previously conventional cemented restorations and the optimal results in esthetic. This experimental study employed the 3D Digital Image Correlation Method (3D-DIC) for detecting shrinkage strain in four dual cured composite cements. The aim was to visualize measure, analyze, and compare strain fields in four resin-based cements using the 3D-DIC method. A total of 72 samples were divided into 4 groups considering variations in sample types, diameter, and thickness. Four types of composite cements: RelyX U200 (3 M ESPE, St. Paul, MN, USA), MaxCem Elite (Kerr, Orange, CA, USA), Multilink Automix (Ivoclar Vivadent, Schaan, Liechtenstein), and SeT PP (SDI, Australia) were used. Each type had diameters of 3 mm, 4 mm, and 5 mm, respectively, combined with two different values of thickness: 1 mm and 2 mm. Thickness had an important role on strain detected in all tested materials showing higher strain in samples with 2 mm thickness compared to 1 mm samples. Shrinkage strain values were the highest in Set PP samples indicated the possibility of undesirable de-bonding.",
publisher = "Hindawi Ltd, London",
journal = "Biomed Research International",
title = "3D Digital Image Correlation Analysis of the Shrinkage Strain in Four Dual Cure Composite Cements",
volume = "2019",
doi = "10.1155/2019/2041348"
}

Mitrović, A., Antonović, D., Tanasić, I., Mitrović, N., Bakić, G., Popović, D.,& Milošević, M.. (2019). 3D Digital Image Correlation Analysis of the Shrinkage Strain in Four Dual Cure Composite Cements. in Biomed Research International
Hindawi Ltd, London., 2019.
https://doi.org/10.1155/2019/2041348

Mitrović A, Antonović D, Tanasić I, Mitrović N, Bakić G, Popović D, Milošević M. 3D Digital Image Correlation Analysis of the Shrinkage Strain in Four Dual Cure Composite Cements. in Biomed Research International. 2019;2019.
doi:10.1155/2019/2041348 .

Mitrović, Aleksandra, Antonović, Dušan, Tanasić, Ivan, Mitrović, Nenad, Bakić, Gordana, Popović, Dejana, Milošević, Miloš, "3D Digital Image Correlation Analysis of the Shrinkage Strain in Four Dual Cure Composite Cements" in Biomed Research International, 2019 (2019),
https://doi.org/10.1155/2019/2041348 . .

TY  - JOUR
AU  - Mitrović, Aleksandra
AU  - Tanasić, Ivan
AU  - Mitrović, Nenad
AU  - Miletić, Vesna
AU  - Bakić, Gordana
AU  - Milošević, Miloš
AU  - Antonović, Dušan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3063
AB  - The study showed an application of the 3 D Digital Image Correlation Method (3 D-DIC) for detection of von Mises strain in samples of the self-etch, self-adhesive resin based cement (RBC). The aim was to determine and compare strain in the self-cured and light-cured Maxcem Elite, furthermore to investigate the hardness of these two cement-types. The experiment was carried out using two groups of Maxcem Elite (Kerr, Orange, CA, USA) samples; each tested group includes five (o5 x 2 mm sized) samples, for both self-curing and light-curing mode. All samples were prepared by filling teflon ring-type molds. In addition, Vickers micro-hardness was measured for all samples. Maxcem Elite showed similar maximum strain values from 10% to 12% for both groups. Besides the maximum strain value, the 3 D-DIC method also enabled monitoring the change of strain field even after the recommended polymerization time. This method has shown that the polymerization shrinkage continues even after 10 min which disagreed with manufacturer's suggestion. Group II showed maximum strain values of 12% in the peripheral zone after 10 min, in the last Stage (Stage 60). Statistically significant difference was not found in the overall strain between self- and light-cured Maxcem Elite neither peripherally (p = 0.118) nor centrally (p = 0.879). However, statistical significance was found in strain regarding central and peripheral zone in both, self-cured (p = 0.020) and light-cured (p = 0.002) Maxcem Elite. The mean von Mises strain values in the periphery of the samples (Section 0) were significantly higher compared to strain values in the center of the samples (for Section 1 and 2). The last stage (Stage 60) of the light-cured Maxcem Elite polymerization showed significantly higher values of von Mises strain compared to initial stage (Stage 0). Higher values of micro-hardness were noticed on the surfaces directly exposed to LED lamp after performing measurements of micro-hardness on light-cured samples.
PB  - Taylor & Francis Ltd, Abingdon
T2  - Journal of Adhesion Science and Technology
T1  - Analysis of the strain and hardness in self-cured and light-cured self-adhesive resin based cement
EP  - 2695
IS  - 24
SP  - 2684
VL  - 33
DO  - 10.1080/01694243.2019.1654221
ER  - 

@article{
author = "Mitrović, Aleksandra and Tanasić, Ivan and Mitrović, Nenad and Miletić, Vesna and Bakić, Gordana and Milošević, Miloš and Antonović, Dušan",
year = "2019",
abstract = "The study showed an application of the 3 D Digital Image Correlation Method (3 D-DIC) for detection of von Mises strain in samples of the self-etch, self-adhesive resin based cement (RBC). The aim was to determine and compare strain in the self-cured and light-cured Maxcem Elite, furthermore to investigate the hardness of these two cement-types. The experiment was carried out using two groups of Maxcem Elite (Kerr, Orange, CA, USA) samples; each tested group includes five (o5 x 2 mm sized) samples, for both self-curing and light-curing mode. All samples were prepared by filling teflon ring-type molds. In addition, Vickers micro-hardness was measured for all samples. Maxcem Elite showed similar maximum strain values from 10% to 12% for both groups. Besides the maximum strain value, the 3 D-DIC method also enabled monitoring the change of strain field even after the recommended polymerization time. This method has shown that the polymerization shrinkage continues even after 10 min which disagreed with manufacturer's suggestion. Group II showed maximum strain values of 12% in the peripheral zone after 10 min, in the last Stage (Stage 60). Statistically significant difference was not found in the overall strain between self- and light-cured Maxcem Elite neither peripherally (p = 0.118) nor centrally (p = 0.879). However, statistical significance was found in strain regarding central and peripheral zone in both, self-cured (p = 0.020) and light-cured (p = 0.002) Maxcem Elite. The mean von Mises strain values in the periphery of the samples (Section 0) were significantly higher compared to strain values in the center of the samples (for Section 1 and 2). The last stage (Stage 60) of the light-cured Maxcem Elite polymerization showed significantly higher values of von Mises strain compared to initial stage (Stage 0). Higher values of micro-hardness were noticed on the surfaces directly exposed to LED lamp after performing measurements of micro-hardness on light-cured samples.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "Journal of Adhesion Science and Technology",
title = "Analysis of the strain and hardness in self-cured and light-cured self-adhesive resin based cement",
pages = "2695-2684",
number = "24",
volume = "33",
doi = "10.1080/01694243.2019.1654221"
}

Mitrović, A., Tanasić, I., Mitrović, N., Miletić, V., Bakić, G., Milošević, M.,& Antonović, D.. (2019). Analysis of the strain and hardness in self-cured and light-cured self-adhesive resin based cement. in Journal of Adhesion Science and Technology
Taylor & Francis Ltd, Abingdon., 33(24), 2684-2695.
https://doi.org/10.1080/01694243.2019.1654221

Mitrović A, Tanasić I, Mitrović N, Miletić V, Bakić G, Milošević M, Antonović D. Analysis of the strain and hardness in self-cured and light-cured self-adhesive resin based cement. in Journal of Adhesion Science and Technology. 2019;33(24):2684-2695.
doi:10.1080/01694243.2019.1654221 .

Mitrović, Aleksandra, Tanasić, Ivan, Mitrović, Nenad, Miletić, Vesna, Bakić, Gordana, Milošević, Miloš, Antonović, Dušan, "Analysis of the strain and hardness in self-cured and light-cured self-adhesive resin based cement" in Journal of Adhesion Science and Technology, 33, no. 24 (2019):2684-2695,
https://doi.org/10.1080/01694243.2019.1654221 . .

TY  - CONF
AU  - Balać, Martina
AU  - Grbović, Aleksandar
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3144
AB  - Structural analysis of pressure equipment (vessels) has always been a huge challenge for researchers. Pressure vessels are usually subjected to different loads in exploitation and small defects can lead to failure of the equipment, which may result in loss of life, health hazards and damage of property. Modern approach of stress and strain analysis of the influence of welded nozzles on pressure vessels involves numerical and experimental testing. In this research, 3D Digital Image Correlation (DIC) method for analyzing full field surface strain and stress, including camera system in combination with Aramis software, was used. After determination of critical areas with highest von Mises stresses and strain concentrations, numerical analysis of equivalent 3D model was performed in Ansys Workbench software. The aim of this paper is to present detailed parameter optimization of pressure vessel with two nozzles based on finite element analysis (FEA) of the structure. Several geometrical parameters were varied to obtain the optimum geometry of the pressure vessel, capable of withstanding the service load without plastic deformation. It is shown that carried out optimization gives the minimum weight of pressure vessel with optimized wall and nozzle thicknesses for the given load.
PB  - Springer International Publishing Ag, Cham
C3  - Experimental and Numerical Investigations in Materials Science and Engineering
T1  - Multiparameter Structural Optimization of Pressure Vessel with Two Nozzles
EP  - 158
SP  - 148
VL  - 54
DO  - 10.1007/978-3-319-99620-2_12
ER  - 

@conference{
author = "Balać, Martina and Grbović, Aleksandar",
year = "2019",
abstract = "Structural analysis of pressure equipment (vessels) has always been a huge challenge for researchers. Pressure vessels are usually subjected to different loads in exploitation and small defects can lead to failure of the equipment, which may result in loss of life, health hazards and damage of property. Modern approach of stress and strain analysis of the influence of welded nozzles on pressure vessels involves numerical and experimental testing. In this research, 3D Digital Image Correlation (DIC) method for analyzing full field surface strain and stress, including camera system in combination with Aramis software, was used. After determination of critical areas with highest von Mises stresses and strain concentrations, numerical analysis of equivalent 3D model was performed in Ansys Workbench software. The aim of this paper is to present detailed parameter optimization of pressure vessel with two nozzles based on finite element analysis (FEA) of the structure. Several geometrical parameters were varied to obtain the optimum geometry of the pressure vessel, capable of withstanding the service load without plastic deformation. It is shown that carried out optimization gives the minimum weight of pressure vessel with optimized wall and nozzle thicknesses for the given load.",
publisher = "Springer International Publishing Ag, Cham",
journal = "Experimental and Numerical Investigations in Materials Science and Engineering",
title = "Multiparameter Structural Optimization of Pressure Vessel with Two Nozzles",
pages = "158-148",
volume = "54",
doi = "10.1007/978-3-319-99620-2_12"
}

Balać, M.,& Grbović, A.. (2019). Multiparameter Structural Optimization of Pressure Vessel with Two Nozzles. in Experimental and Numerical Investigations in Materials Science and Engineering
Springer International Publishing Ag, Cham., 54, 148-158.
https://doi.org/10.1007/978-3-319-99620-2_12

Balać M, Grbović A. Multiparameter Structural Optimization of Pressure Vessel with Two Nozzles. in Experimental and Numerical Investigations in Materials Science and Engineering. 2019;54:148-158.
doi:10.1007/978-3-319-99620-2_12 .

Balać, Martina, Grbović, Aleksandar, "Multiparameter Structural Optimization of Pressure Vessel with Two Nozzles" in Experimental and Numerical Investigations in Materials Science and Engineering, 54 (2019):148-158,
https://doi.org/10.1007/978-3-319-99620-2_12 . .

TY  - JOUR
AU  - Šarac, Dušan
AU  - Mitrović, Nenad
AU  - Tanasić, Ivan
AU  - Mišković, Žarko
AU  - Tihaček-Šojić, Ljiljana
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3242
AB  - Dental-implant overload can cause bone resorption. Load-transfer characteristics of dental implants are affected by their macro-design parameters. The goal of this study was to experimentally analyse the load-transfer characteristics of different dental implants, using polymethyl-methacrylate blocks. Three polymethyl-methacrylate blocks were created, with dimensions of (68 x 25 x 9) mm. Three dental implants, Nobel empty set3.5 mm x 15 mm, Strauman empty set4.1 mm x 10 mm and Strauman empty set4.8 mm x 12 mm. were placed in separate blocks. The samples were supported by a three-point-bending set-up and loaded with an axial force of 600 N. The 3D digital image correlation method was employed for strain and displacement measurements. The highest displacement and von Mises strain values were found for Strauman empty set4.1 mm x 10 mm (p  lt  0.05), 0.186 mm and 0.596 %, respectively. The sample of Nobel empty set3.5 mm x 15 mm showed the lowest strain values. The sample of Strauman empty set4.8 mm x 12 mm (p > 0.05) had similar strain values as Nobel empty set3.5 mm x 15 mm. The load transfer during axial loading was primarily affected by the size of the implant contact surface. The displacement and strain values in the implant vicinity may provide an insight into the effect of dental-implant design on the load transfer.
PB  - Inst Za Kovinske Materiale I In Tehnologie, Ljubjana
T2  - Materiali in Tehnologije
T1  - Experimental analysis of dental-implant load transfer in polymethyl-methacrylate blocks
EP  - 137
IS  - 1
SP  - 133
VL  - 53
DO  - 10.17222/mit.2018.081
ER  - 

@article{
author = "Šarac, Dušan and Mitrović, Nenad and Tanasić, Ivan and Mišković, Žarko and Tihaček-Šojić, Ljiljana",
year = "2019",
abstract = "Dental-implant overload can cause bone resorption. Load-transfer characteristics of dental implants are affected by their macro-design parameters. The goal of this study was to experimentally analyse the load-transfer characteristics of different dental implants, using polymethyl-methacrylate blocks. Three polymethyl-methacrylate blocks were created, with dimensions of (68 x 25 x 9) mm. Three dental implants, Nobel empty set3.5 mm x 15 mm, Strauman empty set4.1 mm x 10 mm and Strauman empty set4.8 mm x 12 mm. were placed in separate blocks. The samples were supported by a three-point-bending set-up and loaded with an axial force of 600 N. The 3D digital image correlation method was employed for strain and displacement measurements. The highest displacement and von Mises strain values were found for Strauman empty set4.1 mm x 10 mm (p  lt  0.05), 0.186 mm and 0.596 %, respectively. The sample of Nobel empty set3.5 mm x 15 mm showed the lowest strain values. The sample of Strauman empty set4.8 mm x 12 mm (p > 0.05) had similar strain values as Nobel empty set3.5 mm x 15 mm. The load transfer during axial loading was primarily affected by the size of the implant contact surface. The displacement and strain values in the implant vicinity may provide an insight into the effect of dental-implant design on the load transfer.",
publisher = "Inst Za Kovinske Materiale I In Tehnologie, Ljubjana",
journal = "Materiali in Tehnologije",
title = "Experimental analysis of dental-implant load transfer in polymethyl-methacrylate blocks",
pages = "137-133",
number = "1",
volume = "53",
doi = "10.17222/mit.2018.081"
}

Šarac, D., Mitrović, N., Tanasić, I., Mišković, Ž.,& Tihaček-Šojić, L.. (2019). Experimental analysis of dental-implant load transfer in polymethyl-methacrylate blocks. in Materiali in Tehnologije
Inst Za Kovinske Materiale I In Tehnologie, Ljubjana., 53(1), 133-137.
https://doi.org/10.17222/mit.2018.081

Šarac D, Mitrović N, Tanasić I, Mišković Ž, Tihaček-Šojić L. Experimental analysis of dental-implant load transfer in polymethyl-methacrylate blocks. in Materiali in Tehnologije. 2019;53(1):133-137.
doi:10.17222/mit.2018.081 .

Šarac, Dušan, Mitrović, Nenad, Tanasić, Ivan, Mišković, Žarko, Tihaček-Šojić, Ljiljana, "Experimental analysis of dental-implant load transfer in polymethyl-methacrylate blocks" in Materiali in Tehnologije, 53, no. 1 (2019):133-137,
https://doi.org/10.17222/mit.2018.081 . .

TY  - JOUR
AU  - Mitrović, Aleksandra
AU  - Tanasić, Ivan
AU  - Mitrović, Nenad
AU  - Milošević, Miloš
AU  - Tihaček-Šojić, Ljiljana
AU  - Antonović, Dušan G.
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2896
AB  - Uvod/Cilj U nastojanju da se pojednostave stomatološke procedure uvedene su nove grupe kompozitnih cemenata - samoadhezivni, dvojnovezujući kompozitni cementi. Svojstva ovih cemenata mogu da variraju u velikoj meri. Jedan od glavnih razloga narušavanja adhezionih svojstava kompozitnih cemenata je polimerizacijska kontrakcija. Cilj ovog rada je da se odredi i izmeri deformaciono polje samoadhezivnog dvojnovezujućeg kompozitnog cementa tokom hemijske polimerizacije korišćenjem eksperimentalne tehnike - metode 3D korelacije digitalnih slika. Metode Samoadhezivni kompozitni cement Maxcem Elite (Kerr, Orange, SAD) ispitivan je na pet uzoraka prečnika 5 mm, debljine 2 mm, koji su pripremljeni punjenjem plastičnih kalupa prstenastog oblika. Digitalne slike su zabeležene neposredno posle pripreme uzoraka. Rezultati Neuniformno deformaciono polje je pokazalo veće vrednosti deformacija na periferiji uzoraka (do 15%) i manje vrednosti deformacija u centralnim delovima uzoraka (oko 4%). Zaključak Može se zaključiti da je 3D korelacija digitalnih slika precizna i pouzdana metoda za merenje deformacionih polja u oblasti karakterizacije materijala.
AB  - Introduction/Objective In an attempt to simplify dental procedures, a new group of resin cements, self-adhesive resin cements (SARCs), have been introduced. Performance of SARCs can widely vary. One of the main reasons of adhesion failure is polymerization shrinkage. The aim of this study was to determine, evaluate, and measure strain field of self-adhesive dual cure resin cement during polymerization in self-cure mode using 3D digital image correlation (DIC) method. Methods The self-adhesive Maxcem Elite (Kerr, Orange, CA, USA) cement was tested in five cylindrical samples (5 mm in diameter and 2 mm in thickness) prepared by filling plastic ring-type molds. Digital images were recorded immediately after sample preparation. Results Non-uniform strain distribution was found in resin cement with higher strain values along the periphery (up to 15%) and lower strain values in central parts (around 4%) of each sample. Conclusion It can be concluded that DIC is a powerful tool for full-field strain measurements in material characterization.
PB  - Srpsko lekarsko društvo, Beograd
T2  - Srpski Arhiv Za Celokupno Lekarstvo
T1  - Utvrđivanje opterećenja samovezujućeg kompozitnog cementa primenom metode 3D korelacije digitalnih slika
T1  - Strain determination of self-adhesive resin cement using 3D digital image correlation method
EP  - 377
IS  - 7-8
SP  - 372
VL  - 146
DO  - 10.2298/SARH170530176M
ER  - 

@article{
author = "Mitrović, Aleksandra and Tanasić, Ivan and Mitrović, Nenad and Milošević, Miloš and Tihaček-Šojić, Ljiljana and Antonović, Dušan G.",
year = "2018",
abstract = "Uvod/Cilj U nastojanju da se pojednostave stomatološke procedure uvedene su nove grupe kompozitnih cemenata - samoadhezivni, dvojnovezujući kompozitni cementi. Svojstva ovih cemenata mogu da variraju u velikoj meri. Jedan od glavnih razloga narušavanja adhezionih svojstava kompozitnih cemenata je polimerizacijska kontrakcija. Cilj ovog rada je da se odredi i izmeri deformaciono polje samoadhezivnog dvojnovezujućeg kompozitnog cementa tokom hemijske polimerizacije korišćenjem eksperimentalne tehnike - metode 3D korelacije digitalnih slika. Metode Samoadhezivni kompozitni cement Maxcem Elite (Kerr, Orange, SAD) ispitivan je na pet uzoraka prečnika 5 mm, debljine 2 mm, koji su pripremljeni punjenjem plastičnih kalupa prstenastog oblika. Digitalne slike su zabeležene neposredno posle pripreme uzoraka. Rezultati Neuniformno deformaciono polje je pokazalo veće vrednosti deformacija na periferiji uzoraka (do 15%) i manje vrednosti deformacija u centralnim delovima uzoraka (oko 4%). Zaključak Može se zaključiti da je 3D korelacija digitalnih slika precizna i pouzdana metoda za merenje deformacionih polja u oblasti karakterizacije materijala., Introduction/Objective In an attempt to simplify dental procedures, a new group of resin cements, self-adhesive resin cements (SARCs), have been introduced. Performance of SARCs can widely vary. One of the main reasons of adhesion failure is polymerization shrinkage. The aim of this study was to determine, evaluate, and measure strain field of self-adhesive dual cure resin cement during polymerization in self-cure mode using 3D digital image correlation (DIC) method. Methods The self-adhesive Maxcem Elite (Kerr, Orange, CA, USA) cement was tested in five cylindrical samples (5 mm in diameter and 2 mm in thickness) prepared by filling plastic ring-type molds. Digital images were recorded immediately after sample preparation. Results Non-uniform strain distribution was found in resin cement with higher strain values along the periphery (up to 15%) and lower strain values in central parts (around 4%) of each sample. Conclusion It can be concluded that DIC is a powerful tool for full-field strain measurements in material characterization.",
publisher = "Srpsko lekarsko društvo, Beograd",
journal = "Srpski Arhiv Za Celokupno Lekarstvo",
title = "Utvrđivanje opterećenja samovezujućeg kompozitnog cementa primenom metode 3D korelacije digitalnih slika, Strain determination of self-adhesive resin cement using 3D digital image correlation method",
pages = "377-372",
number = "7-8",
volume = "146",
doi = "10.2298/SARH170530176M"
}

Mitrović, A., Tanasić, I., Mitrović, N., Milošević, M., Tihaček-Šojić, L.,& Antonović, D. G.. (2018). Utvrđivanje opterećenja samovezujućeg kompozitnog cementa primenom metode 3D korelacije digitalnih slika. in Srpski Arhiv Za Celokupno Lekarstvo
Srpsko lekarsko društvo, Beograd., 146(7-8), 372-377.
https://doi.org/10.2298/SARH170530176M

Mitrović A, Tanasić I, Mitrović N, Milošević M, Tihaček-Šojić L, Antonović DG. Utvrđivanje opterećenja samovezujućeg kompozitnog cementa primenom metode 3D korelacije digitalnih slika. in Srpski Arhiv Za Celokupno Lekarstvo. 2018;146(7-8):372-377.
doi:10.2298/SARH170530176M .

Mitrović, Aleksandra, Tanasić, Ivan, Mitrović, Nenad, Milošević, Miloš, Tihaček-Šojić, Ljiljana, Antonović, Dušan G., "Utvrđivanje opterećenja samovezujućeg kompozitnog cementa primenom metode 3D korelacije digitalnih slika" in Srpski Arhiv Za Celokupno Lekarstvo, 146, no. 7-8 (2018):372-377,
https://doi.org/10.2298/SARH170530176M . .

TY  - GEN
AU  - Balać, Martina
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6058
AB  - The main aim of many researchers is to solve the problem of shape optimization of the pressure vessels in order to save materials and energy during manufacturing, but preserve reliability during exploitation. Structural optimization of several parameters that have main impact on stress, strain and deformation state of the pressure vessels is presented in this research. Modern approach of stress and strain analysis on pressure vessels involves numerical and experimental testing. Experimental 3D Digital Image Correlation (DIC) method for analyzing full field of surface strain and stress including camera system in combination with Aramis software was used. After determination of areas with highest von Mises stresses and strain concentrations, numerical analysis of equivalent 3D model was performed in Ansys Workbench software. Results in critical areas were compared and they showed good agreement. Then, several parameters were chosen for optimization in order to reduce stresses and mass weight of pressure vessel. Response Surface Optimization (RSO) method was used to optimize geometry of the pressure vessel parts (shell, head and nozzles). It is shown that carried out optimization gives the minimum weight of pressure vessel with optimized wall and nozzle thicknesses for the given load.
PB  - Innovation Center of Faculty of Mechanical Engineering Belgrade
T2  - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2018
T1  - structural optimization of pressure vessels using FEA
SP  - 32
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6058
ER  - 

@misc{
author = "Balać, Martina",
year = "2018",
abstract = "The main aim of many researchers is to solve the problem of shape optimization of the pressure vessels in order to save materials and energy during manufacturing, but preserve reliability during exploitation. Structural optimization of several parameters that have main impact on stress, strain and deformation state of the pressure vessels is presented in this research. Modern approach of stress and strain analysis on pressure vessels involves numerical and experimental testing. Experimental 3D Digital Image Correlation (DIC) method for analyzing full field of surface strain and stress including camera system in combination with Aramis software was used. After determination of areas with highest von Mises stresses and strain concentrations, numerical analysis of equivalent 3D model was performed in Ansys Workbench software. Results in critical areas were compared and they showed good agreement. Then, several parameters were chosen for optimization in order to reduce stresses and mass weight of pressure vessel. Response Surface Optimization (RSO) method was used to optimize geometry of the pressure vessel parts (shell, head and nozzles). It is shown that carried out optimization gives the minimum weight of pressure vessel with optimized wall and nozzle thicknesses for the given load.",
publisher = "Innovation Center of Faculty of Mechanical Engineering Belgrade",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2018",
title = "structural optimization of pressure vessels using FEA",
pages = "32",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6058"
}

Balać, M.. (2018). structural optimization of pressure vessels using FEA. in International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2018
Innovation Center of Faculty of Mechanical Engineering Belgrade., 32.
https://hdl.handle.net/21.15107/rcub_machinery_6058

Balać M. structural optimization of pressure vessels using FEA. in International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2018. 2018;:32.
https://hdl.handle.net/21.15107/rcub_machinery_6058 .

Balać, Martina, "structural optimization of pressure vessels using FEA" in International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2018 (2018):32,
https://hdl.handle.net/21.15107/rcub_machinery_6058 .

TY  - JOUR
AU  - Balać, Martina
AU  - Grbović, Aleksandar
AU  - Petrović, Aleksandar
AU  - Popović, Vladimir
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2919
AB  - To ensure reliability of pressure vessels during service it is necessary to (1) know properties of materials used in their design and (2) evaluate vessels' behaviour under different working conditions with satisfying accuracy. Due to various technical and/or technological requirements, nozzles are usually welded on vessel's shell producing geometrical discontinuities that reduce the safety factor. To evaluate their influence, vessels with two different nozzles were experimentally studied and critical areas for crack initiation have been identified by 3D Digital Image Correlation (DIC) method. After that, the numerical analysis of equivalent 3D finite element model was performed and obtained results were compared with experimental values. In the most critical area, next to the one of the nozzles, crack was initiated and then growth of the damage was simulated using extended finite element method (XFEM). In this paper evaluation of stress intensity factors (SIFs) along crack path is presented, as well as the most probable direction of the crack propagation on the shell. Based on SIFs values, critical length of the crack and number of pressure cycles to the final failure were estimated.
PB  - Polish Maintenance Soc, Lublin
T2  - Eksploatacja I Niezawodnosc-Maintenance and Reliability
T1  - Fem analysis of pressure vessel with an investigation of crack growth on cylindrical surface
EP  - 386
IS  - 3
SP  - 378
VL  - 20
DO  - 10.17531/ein.2018.3.5
ER  - 

@article{
author = "Balać, Martina and Grbović, Aleksandar and Petrović, Aleksandar and Popović, Vladimir",
year = "2018",
abstract = "To ensure reliability of pressure vessels during service it is necessary to (1) know properties of materials used in their design and (2) evaluate vessels' behaviour under different working conditions with satisfying accuracy. Due to various technical and/or technological requirements, nozzles are usually welded on vessel's shell producing geometrical discontinuities that reduce the safety factor. To evaluate their influence, vessels with two different nozzles were experimentally studied and critical areas for crack initiation have been identified by 3D Digital Image Correlation (DIC) method. After that, the numerical analysis of equivalent 3D finite element model was performed and obtained results were compared with experimental values. In the most critical area, next to the one of the nozzles, crack was initiated and then growth of the damage was simulated using extended finite element method (XFEM). In this paper evaluation of stress intensity factors (SIFs) along crack path is presented, as well as the most probable direction of the crack propagation on the shell. Based on SIFs values, critical length of the crack and number of pressure cycles to the final failure were estimated.",
publisher = "Polish Maintenance Soc, Lublin",
journal = "Eksploatacja I Niezawodnosc-Maintenance and Reliability",
title = "Fem analysis of pressure vessel with an investigation of crack growth on cylindrical surface",
pages = "386-378",
number = "3",
volume = "20",
doi = "10.17531/ein.2018.3.5"
}

Balać, M., Grbović, A., Petrović, A.,& Popović, V.. (2018). Fem analysis of pressure vessel with an investigation of crack growth on cylindrical surface. in Eksploatacja I Niezawodnosc-Maintenance and Reliability
Polish Maintenance Soc, Lublin., 20(3), 378-386.
https://doi.org/10.17531/ein.2018.3.5

Balać M, Grbović A, Petrović A, Popović V. Fem analysis of pressure vessel with an investigation of crack growth on cylindrical surface. in Eksploatacja I Niezawodnosc-Maintenance and Reliability. 2018;20(3):378-386.
doi:10.17531/ein.2018.3.5 .

Balać, Martina, Grbović, Aleksandar, Petrović, Aleksandar, Popović, Vladimir, "Fem analysis of pressure vessel with an investigation of crack growth on cylindrical surface" in Eksploatacja I Niezawodnosc-Maintenance and Reliability, 20, no. 3 (2018):378-386,
https://doi.org/10.17531/ein.2018.3.5 . .

TY  - JOUR
AU  - Petrović, Andrija
AU  - Svorcan, Jelena
AU  - Pejčev, Aleksandar
AU  - Radenković, Darko
AU  - Petrović, Aleksandar
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2930
AB  - Different applications of a variable area convergent-divergent nozzle are found in various parts of the industry. This paper presents the development of a new design methodology for a variable area convergent-divergent nozzle, to maintain constant nozzle area ratio for different values of mass flow rates. The validation of the presented model was carried out on an example supersonic ejector using experimental, numerical and analytical data. Analytical (one dimensional) and computational fluid dynamics models showed satisfactory prediction performance in comparison with the experiment. The average entrainment ratio error was between 10% and 7%, respectively. Results confirmed that the velocity of the primary fluid at the nozzle outlet is in accordance with the one dimensional analysis. Although disturbances (strong and weak shock waves) are visible, their effects are negligible. Also, supersonic ejector performances are presented through relations between entrainment ratio, outlet pressure and spindle position. Disadvantages of variable area nozzle utilization in ejector applications are emphasized.
PB  - Elsevier Science Inc, New York
T2  - Applied Mathematical Modelling
T1  - Comparison of novel variable area convergent-divergent nozzle performances obtained by analytic, computational and experimental methods
EP  - 225
SP  - 206
VL  - 57
DO  - 10.1016/j.apm.2018.01.016
ER  - 

@article{
author = "Petrović, Andrija and Svorcan, Jelena and Pejčev, Aleksandar and Radenković, Darko and Petrović, Aleksandar",
year = "2018",
abstract = "Different applications of a variable area convergent-divergent nozzle are found in various parts of the industry. This paper presents the development of a new design methodology for a variable area convergent-divergent nozzle, to maintain constant nozzle area ratio for different values of mass flow rates. The validation of the presented model was carried out on an example supersonic ejector using experimental, numerical and analytical data. Analytical (one dimensional) and computational fluid dynamics models showed satisfactory prediction performance in comparison with the experiment. The average entrainment ratio error was between 10% and 7%, respectively. Results confirmed that the velocity of the primary fluid at the nozzle outlet is in accordance with the one dimensional analysis. Although disturbances (strong and weak shock waves) are visible, their effects are negligible. Also, supersonic ejector performances are presented through relations between entrainment ratio, outlet pressure and spindle position. Disadvantages of variable area nozzle utilization in ejector applications are emphasized.",
publisher = "Elsevier Science Inc, New York",
journal = "Applied Mathematical Modelling",
title = "Comparison of novel variable area convergent-divergent nozzle performances obtained by analytic, computational and experimental methods",
pages = "225-206",
volume = "57",
doi = "10.1016/j.apm.2018.01.016"
}

Petrović, A., Svorcan, J., Pejčev, A., Radenković, D.,& Petrović, A.. (2018). Comparison of novel variable area convergent-divergent nozzle performances obtained by analytic, computational and experimental methods. in Applied Mathematical Modelling
Elsevier Science Inc, New York., 57, 206-225.
https://doi.org/10.1016/j.apm.2018.01.016

Petrović A, Svorcan J, Pejčev A, Radenković D, Petrović A. Comparison of novel variable area convergent-divergent nozzle performances obtained by analytic, computational and experimental methods. in Applied Mathematical Modelling. 2018;57:206-225.
doi:10.1016/j.apm.2018.01.016 .

Petrović, Andrija, Svorcan, Jelena, Pejčev, Aleksandar, Radenković, Darko, Petrović, Aleksandar, "Comparison of novel variable area convergent-divergent nozzle performances obtained by analytic, computational and experimental methods" in Applied Mathematical Modelling, 57 (2018):206-225,
https://doi.org/10.1016/j.apm.2018.01.016 . .

TY  - CONF
AU  - Mitrović, Nenad
AU  - Petrović, Aleksandar
AU  - Milošević, Miloš
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2794
AB  - Pressure equipment has widespread application in various industrial sectors. Due to this variety, pressure equipment can have complex structure and is subjected to different working loads (static, dynamic, thermal etc.) during the operation life that can cause failure. Strain measurement of complex structure has always been a huge challenge for researchers. Conventional experimental methods (e.g. strain gauges) give only limited data sets regarding measurement on critical areas with high geometrical discontinuities. 3D Digital Image Correlation method is an optical method that enables full-field strain measurement of critical areas on structural components. Sphere/cylinder junction is common geometrical discontinuity on pressure equipment and globe valve housing was chosen as representative example. In this paper, globe valve housing was subjected to external axial loading caused by pipeline dilatations. Highest measured von Mises strain values around 0.15 % were recorded on cylinder/sphere intersection. Determining strain state of critical areas enables better understanding of complex structures and provides an opportunity for further development and improvement for practical industrial application.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
T1  - Strain measurement of pressure equipment components using 3D Digital Image Correlation method
EP  - 1608
SP  - 1605
VL  - 13
DO  - 10.1016/j.prostr.2018.12.338
ER  - 

@conference{
author = "Mitrović, Nenad and Petrović, Aleksandar and Milošević, Miloš",
year = "2018",
abstract = "Pressure equipment has widespread application in various industrial sectors. Due to this variety, pressure equipment can have complex structure and is subjected to different working loads (static, dynamic, thermal etc.) during the operation life that can cause failure. Strain measurement of complex structure has always been a huge challenge for researchers. Conventional experimental methods (e.g. strain gauges) give only limited data sets regarding measurement on critical areas with high geometrical discontinuities. 3D Digital Image Correlation method is an optical method that enables full-field strain measurement of critical areas on structural components. Sphere/cylinder junction is common geometrical discontinuity on pressure equipment and globe valve housing was chosen as representative example. In this paper, globe valve housing was subjected to external axial loading caused by pipeline dilatations. Highest measured von Mises strain values around 0.15 % were recorded on cylinder/sphere intersection. Determining strain state of critical areas enables better understanding of complex structures and provides an opportunity for further development and improvement for practical industrial application.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity",
title = "Strain measurement of pressure equipment components using 3D Digital Image Correlation method",
pages = "1608-1605",
volume = "13",
doi = "10.1016/j.prostr.2018.12.338"
}

Mitrović, N., Petrović, A.,& Milošević, M.. (2018). Strain measurement of pressure equipment components using 3D Digital Image Correlation method. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity
Elsevier Science Bv, Amsterdam., 13, 1605-1608.
https://doi.org/10.1016/j.prostr.2018.12.338

Mitrović N, Petrović A, Milošević M. Strain measurement of pressure equipment components using 3D Digital Image Correlation method. in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity. 2018;13:1605-1608.
doi:10.1016/j.prostr.2018.12.338 .

Mitrović, Nenad, Petrović, Aleksandar, Milošević, Miloš, "Strain measurement of pressure equipment components using 3D Digital Image Correlation method" in Procedia Structural Integrity - ECF22 - Loading and environmental effects on structural integrity, 13 (2018):1605-1608,
https://doi.org/10.1016/j.prostr.2018.12.338 . .

TY  - JOUR
AU  - Šarac, Dušan
AU  - Mitrović, Nenad
AU  - Tanasić, Ivan
AU  - Tihaček-Šojić, Ljiljana
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2859
AB  - Dizajn dentalnih implanata utiče na vrednosti deformacija koje nastaju u njihovoj okolini, i ako se pređe granična vrednost od 0.3 %, može doći do resorpcije kosti. Cilj ove studije je da predstavi novi eksperimentalni pristup za analizu uticaja geometrije dentalnih implanata na deformacije okolne strukture. Model kosti, sa dimenzijama od 68h25h9 mm, je napravljen od polimetil-metakrilata. Kalup za model koji je napravljen pomoću tehnike 3D štampe, je takođe služio i kao fiksator položaja za vertikalno postavljeni implant Štrauman ø4.0x12 mm. Uzorak je opterećen na savijanje u tri tačke. Aksijalna sila od 600 N je primenjena na dentalni implant. Za merenje deformacija i pomeraja je korišćena metoda Digitalne korelacije slika. Najveće vrednosti Von Mizesovih deformacija od 0.7 % su izmerene u području vrata implanta. Maksimalne vrednosti pomeraja u pravcu opterećenja su iznosile 0.466 mm. Površinska deformacija i pomeraji su povezani sa geometrijom implanata. Ova eksperimentalna metodologija se može koristiti u cilju određivanja karakteristika prenosa opterećenja dentalnih.
AB  - Deformations in the vicinity of dental implants are affected by their design and if threshold level of 0.3 % is surpassed, bone resorption could occur. The goal of this study is to present a novel experimental approch for the analysis of effect od dental implant geometry on the surrounding structure strain values. A bone block model, with dimensions of 68x25x9 mm, was made from polymethyl-methacrylate. 3D printed block mold also provided a fixture for vertically placed Strauman ø4.0x12 mm. The sample was loaded in a three-point bending setup. The axial force of 600 N was applied on the dental implant. The Digital Image Correlation method was used for strain and displacement measurement. The highest von Mises strain of 0.7 % is located in the area of implant neck. The maximum displacement value in loading direction was 0.466 mm. Surface strain and displacement are correlated with implant geometry. This experimental methodology can be utilized to estimate dental implant load transfer characteristics.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Eksperimentalna metodologija za određivanje uticaja dizajna dentalnih implanata na prenos opterećenja
T1  - Experimental methodology for analysis of influence of dental implant design on load transfer
EP  - 271
IS  - 2
SP  - 266
VL  - 46
DO  - 10.5937/fmet1802266S
ER  - 

@article{
author = "Šarac, Dušan and Mitrović, Nenad and Tanasić, Ivan and Tihaček-Šojić, Ljiljana",
year = "2018",
abstract = "Dizajn dentalnih implanata utiče na vrednosti deformacija koje nastaju u njihovoj okolini, i ako se pređe granična vrednost od 0.3 %, može doći do resorpcije kosti. Cilj ove studije je da predstavi novi eksperimentalni pristup za analizu uticaja geometrije dentalnih implanata na deformacije okolne strukture. Model kosti, sa dimenzijama od 68h25h9 mm, je napravljen od polimetil-metakrilata. Kalup za model koji je napravljen pomoću tehnike 3D štampe, je takođe služio i kao fiksator položaja za vertikalno postavljeni implant Štrauman ø4.0x12 mm. Uzorak je opterećen na savijanje u tri tačke. Aksijalna sila od 600 N je primenjena na dentalni implant. Za merenje deformacija i pomeraja je korišćena metoda Digitalne korelacije slika. Najveće vrednosti Von Mizesovih deformacija od 0.7 % su izmerene u području vrata implanta. Maksimalne vrednosti pomeraja u pravcu opterećenja su iznosile 0.466 mm. Površinska deformacija i pomeraji su povezani sa geometrijom implanata. Ova eksperimentalna metodologija se može koristiti u cilju određivanja karakteristika prenosa opterećenja dentalnih., Deformations in the vicinity of dental implants are affected by their design and if threshold level of 0.3 % is surpassed, bone resorption could occur. The goal of this study is to present a novel experimental approch for the analysis of effect od dental implant geometry on the surrounding structure strain values. A bone block model, with dimensions of 68x25x9 mm, was made from polymethyl-methacrylate. 3D printed block mold also provided a fixture for vertically placed Strauman ø4.0x12 mm. The sample was loaded in a three-point bending setup. The axial force of 600 N was applied on the dental implant. The Digital Image Correlation method was used for strain and displacement measurement. The highest von Mises strain of 0.7 % is located in the area of implant neck. The maximum displacement value in loading direction was 0.466 mm. Surface strain and displacement are correlated with implant geometry. This experimental methodology can be utilized to estimate dental implant load transfer characteristics.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Eksperimentalna metodologija za određivanje uticaja dizajna dentalnih implanata na prenos opterećenja, Experimental methodology for analysis of influence of dental implant design on load transfer",
pages = "271-266",
number = "2",
volume = "46",
doi = "10.5937/fmet1802266S"
}

Šarac, D., Mitrović, N., Tanasić, I.,& Tihaček-Šojić, L.. (2018). Eksperimentalna metodologija za određivanje uticaja dizajna dentalnih implanata na prenos opterećenja. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 46(2), 266-271.
https://doi.org/10.5937/fmet1802266S

Šarac D, Mitrović N, Tanasić I, Tihaček-Šojić L. Eksperimentalna metodologija za određivanje uticaja dizajna dentalnih implanata na prenos opterećenja. in FME Transactions. 2018;46(2):266-271.
doi:10.5937/fmet1802266S .

Šarac, Dušan, Mitrović, Nenad, Tanasić, Ivan, Tihaček-Šojić, Ljiljana, "Eksperimentalna metodologija za određivanje uticaja dizajna dentalnih implanata na prenos opterećenja" in FME Transactions, 46, no. 2 (2018):266-271,
https://doi.org/10.5937/fmet1802266S . .

TY  - JOUR
AU  - Bajić, Darko
AU  - Momčilović, Nikola
AU  - Maneski, Taško
AU  - Balać, Martina
AU  - Kozak, Dražan
AU  - Culafić, Stefan
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2521
AB  - The subject of this paper is testing of complex geometrical structures, i.e. stress analysis of a pipe branch model of A6 third pipeline at Hydropower Plant Perucica, Niksic. Analysis of pipe branch model stress distribution was carried out by using finite element method and experimental methods. Finite element method defined 3D pipe branch model. Numerical calculation defined critical locations on model, i.e. locations with the greatest stress concentration. Strain gauges were placed on identified critical locations. Measured stress values confirmed values obtained by using numerical calculation. Experimental measurements were also taken by using new digital image correlation (DIC) method. DIC method is an optical non-contact method that can provide full 3D stress field and enables better understanding of complex structures such as pipe branches. The aim of this paper was to determine stress concentration factor for the pipe branch model by using numerical and experimental analysis.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Numerical and experimental determination of stress concentration factor for a pipe branch model
EP  - 692
IS  - 3
SP  - 687
VL  - 24
DO  - 10.17559/TV-20151126222916
ER  - 

@article{
author = "Bajić, Darko and Momčilović, Nikola and Maneski, Taško and Balać, Martina and Kozak, Dražan and Culafić, Stefan",
year = "2017",
abstract = "The subject of this paper is testing of complex geometrical structures, i.e. stress analysis of a pipe branch model of A6 third pipeline at Hydropower Plant Perucica, Niksic. Analysis of pipe branch model stress distribution was carried out by using finite element method and experimental methods. Finite element method defined 3D pipe branch model. Numerical calculation defined critical locations on model, i.e. locations with the greatest stress concentration. Strain gauges were placed on identified critical locations. Measured stress values confirmed values obtained by using numerical calculation. Experimental measurements were also taken by using new digital image correlation (DIC) method. DIC method is an optical non-contact method that can provide full 3D stress field and enables better understanding of complex structures such as pipe branches. The aim of this paper was to determine stress concentration factor for the pipe branch model by using numerical and experimental analysis.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Numerical and experimental determination of stress concentration factor for a pipe branch model",
pages = "692-687",
number = "3",
volume = "24",
doi = "10.17559/TV-20151126222916"
}

Bajić, D., Momčilović, N., Maneski, T., Balać, M., Kozak, D.,& Culafić, S.. (2017). Numerical and experimental determination of stress concentration factor for a pipe branch model. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 24(3), 687-692.
https://doi.org/10.17559/TV-20151126222916

Bajić D, Momčilović N, Maneski T, Balać M, Kozak D, Culafić S. Numerical and experimental determination of stress concentration factor for a pipe branch model. in Tehnički vjesnik. 2017;24(3):687-692.
doi:10.17559/TV-20151126222916 .

Bajić, Darko, Momčilović, Nikola, Maneski, Taško, Balać, Martina, Kozak, Dražan, Culafić, Stefan, "Numerical and experimental determination of stress concentration factor for a pipe branch model" in Tehnički vjesnik, 24, no. 3 (2017):687-692,
https://doi.org/10.17559/TV-20151126222916 . .

TY  - BOOK
AU  - Mitrović, Nenad
AU  - Balać, Martina
AU  - Petrović, Aleksandar
AU  - Milošević, Miloš
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6146
PB  - Univerzitet u Beogradu Mašinski fakultet
T2  - Univerzitet u Beogradu Mašinski fakultet
T1  - Primena metode korelacije digitalnih slika (digital image correlation – dic) opremu pod pritiskom
EP  - 347
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6146
ER  - 

@book{
author = "Mitrović, Nenad and Balać, Martina and Petrović, Aleksandar and Milošević, Miloš",
year = "2017",
publisher = "Univerzitet u Beogradu Mašinski fakultet",
journal = "Univerzitet u Beogradu Mašinski fakultet",
title = "Primena metode korelacije digitalnih slika (digital image correlation – dic) opremu pod pritiskom",
pages = "347-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6146"
}

Mitrović, N., Balać, M., Petrović, A.,& Milošević, M.. (2017). Primena metode korelacije digitalnih slika (digital image correlation – dic) opremu pod pritiskom. in Univerzitet u Beogradu Mašinski fakultet
Univerzitet u Beogradu Mašinski fakultet., 1-347.
https://hdl.handle.net/21.15107/rcub_machinery_6146

Mitrović N, Balać M, Petrović A, Milošević M. Primena metode korelacije digitalnih slika (digital image correlation – dic) opremu pod pritiskom. in Univerzitet u Beogradu Mašinski fakultet. 2017;:1-347.
https://hdl.handle.net/21.15107/rcub_machinery_6146 .

Mitrović, Nenad, Balać, Martina, Petrović, Aleksandar, Milošević, Miloš, "Primena metode korelacije digitalnih slika (digital image correlation – dic) opremu pod pritiskom" in Univerzitet u Beogradu Mašinski fakultet (2017):1-347,
https://hdl.handle.net/21.15107/rcub_machinery_6146 .

TY  - JOUR
AU  - Mitrović, Nenad
AU  - Petrović, Aleksandar
AU  - Milošević, Miloš
AU  - Momčilović, Nikola
AU  - Mišković, Žarko
AU  - Maneski, Taško
AU  - Popović, Predrag
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2635
AB  - Complex structure experimental analysis has always been a huge challenge for researchers. Conventional experimental methods (e.g., strain gauges) give only limited data sets regarding measurement on critical areas with high geometrical discontinuities. A 3D Digital Image Correlation method is an optical method that overcomes the limitations of conventional methods and enables full-field displacement and strain measurement of geometrically complex structures. System Aramis, based on Digital Image Correlation method, is used for experimental analysis and numerical model verification in this paper. Investigated complex structure is sphere/cylinder junction on globe valve housing subjected to axial loading. The highest experimentally measured von Mises strain values around 0.15% are recorded on cylinder/sphere intersection. Von Mises strain values on cylindrical and spherical part are several times smaller than on intersection itself. It is important to emphasize that, to the authors' best knowledge, this is the first paper showing experimental results of 3D full and strain field of geometrically complex structure (sphere/cylinder intersection) on the intersection itself on pressure equipment. It is proven that 3D Digital Image Correlation method is fast and versatile method for recording strain during loading of complex structures.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska Industrija
T1  - Experimental and numerical study of globe valve housing
EP  - 257
IS  - 3
SP  - 251
VL  - 71
DO  - 10.2298/HEMIND160516035M
ER  - 

@article{
author = "Mitrović, Nenad and Petrović, Aleksandar and Milošević, Miloš and Momčilović, Nikola and Mišković, Žarko and Maneski, Taško and Popović, Predrag",
year = "2017",
abstract = "Complex structure experimental analysis has always been a huge challenge for researchers. Conventional experimental methods (e.g., strain gauges) give only limited data sets regarding measurement on critical areas with high geometrical discontinuities. A 3D Digital Image Correlation method is an optical method that overcomes the limitations of conventional methods and enables full-field displacement and strain measurement of geometrically complex structures. System Aramis, based on Digital Image Correlation method, is used for experimental analysis and numerical model verification in this paper. Investigated complex structure is sphere/cylinder junction on globe valve housing subjected to axial loading. The highest experimentally measured von Mises strain values around 0.15% are recorded on cylinder/sphere intersection. Von Mises strain values on cylindrical and spherical part are several times smaller than on intersection itself. It is important to emphasize that, to the authors' best knowledge, this is the first paper showing experimental results of 3D full and strain field of geometrically complex structure (sphere/cylinder intersection) on the intersection itself on pressure equipment. It is proven that 3D Digital Image Correlation method is fast and versatile method for recording strain during loading of complex structures.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska Industrija",
title = "Experimental and numerical study of globe valve housing",
pages = "257-251",
number = "3",
volume = "71",
doi = "10.2298/HEMIND160516035M"
}

Mitrović, N., Petrović, A., Milošević, M., Momčilović, N., Mišković, Ž., Maneski, T.,& Popović, P.. (2017). Experimental and numerical study of globe valve housing. in Hemijska Industrija
Savez hemijskih inženjera, Beograd., 71(3), 251-257.
https://doi.org/10.2298/HEMIND160516035M

Mitrović N, Petrović A, Milošević M, Momčilović N, Mišković Ž, Maneski T, Popović P. Experimental and numerical study of globe valve housing. in Hemijska Industrija. 2017;71(3):251-257.
doi:10.2298/HEMIND160516035M .

Mitrović, Nenad, Petrović, Aleksandar, Milošević, Miloš, Momčilović, Nikola, Mišković, Žarko, Maneski, Taško, Popović, Predrag, "Experimental and numerical study of globe valve housing" in Hemijska Industrija, 71, no. 3 (2017):251-257,
https://doi.org/10.2298/HEMIND160516035M . .

TY  - JOUR
AU  - Šarac, Dušan
AU  - Atanasovska, Ivana
AU  - Vulović, S.
AU  - Mitrović, Nenad
AU  - Tanasić, Ivan
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2623
AB  - This paper contains the results of a research focused on the determination of the influence of an implant inclination on the strain state throughout the acrylic block with implant. The aim of the presented research is to qualitatively determine the regions with the greatest strain fields on the models. The finite element models of implant and acrylic block are developed for predefined implant inclinations in order to analyze the influence of implant inclination on deformations on the outer surface of acrylic block. The comparative contour plots of stress and strain state of analyzed models, as well as the comparative diagrams with obtained results, are presented. The conclusions about the inclination angle which leads to the higher strains in the block-implant are explained. Obtained results could be applied for the planning of future experimental studies which could utilize this and similar models to determine their load transfer characteristics, and could be included in the planning of dental implant position, and prediction of successful dental therapy.
PB  - Univerzitet u Kragujevcu - Fakultet inženjerskih nauka, Kragujevac
T2  - Journal of The Serbian Society For Computational Mechanics
T1  - Numerical Study of the Effect of Dental Implant Inclination
EP  - 79
IS  - 2
SP  - 63
VL  - 11
DO  - 10.24874/jsscm.2017.11.02.06
ER  - 

@article{
author = "Šarac, Dušan and Atanasovska, Ivana and Vulović, S. and Mitrović, Nenad and Tanasić, Ivan",
year = "2017",
abstract = "This paper contains the results of a research focused on the determination of the influence of an implant inclination on the strain state throughout the acrylic block with implant. The aim of the presented research is to qualitatively determine the regions with the greatest strain fields on the models. The finite element models of implant and acrylic block are developed for predefined implant inclinations in order to analyze the influence of implant inclination on deformations on the outer surface of acrylic block. The comparative contour plots of stress and strain state of analyzed models, as well as the comparative diagrams with obtained results, are presented. The conclusions about the inclination angle which leads to the higher strains in the block-implant are explained. Obtained results could be applied for the planning of future experimental studies which could utilize this and similar models to determine their load transfer characteristics, and could be included in the planning of dental implant position, and prediction of successful dental therapy.",
publisher = "Univerzitet u Kragujevcu - Fakultet inženjerskih nauka, Kragujevac",
journal = "Journal of The Serbian Society For Computational Mechanics",
title = "Numerical Study of the Effect of Dental Implant Inclination",
pages = "79-63",
number = "2",
volume = "11",
doi = "10.24874/jsscm.2017.11.02.06"
}

Šarac, D., Atanasovska, I., Vulović, S., Mitrović, N.,& Tanasić, I.. (2017). Numerical Study of the Effect of Dental Implant Inclination. in Journal of The Serbian Society For Computational Mechanics
Univerzitet u Kragujevcu - Fakultet inženjerskih nauka, Kragujevac., 11(2), 63-79.
https://doi.org/10.24874/jsscm.2017.11.02.06

Šarac D, Atanasovska I, Vulović S, Mitrović N, Tanasić I. Numerical Study of the Effect of Dental Implant Inclination. in Journal of The Serbian Society For Computational Mechanics. 2017;11(2):63-79.
doi:10.24874/jsscm.2017.11.02.06 .

Šarac, Dušan, Atanasovska, Ivana, Vulović, S., Mitrović, Nenad, Tanasić, Ivan, "Numerical Study of the Effect of Dental Implant Inclination" in Journal of The Serbian Society For Computational Mechanics, 11, no. 2 (2017):63-79,
https://doi.org/10.24874/jsscm.2017.11.02.06 . .

TY  - THES
AU  - Balać, Martina
PY  - 2014
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=3577
UR  - https://nardus.mpn.gov.rs/handle/123456789/6234
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:12321/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=514536355
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6176
AB  - Većina istraživača koja se bavi problematikom određivanja i merenja napona ideformacija na posudama pod pritiskom, fokusirala se na analizu uticaja jednog priključkana napone i deformacije na posudi. Dosadašnja istraživanja su se oslanjala na analitičkeproračune bazirane na teoriji ljuske, numeričke proračune i konvencionalneeksperimentalne metode. Najčešće korišćena konvencionalna metoda je metoda mernihtraka. Ograničenja ove metode se ogledaju u lokalnom merenju napona i deformacija, idobijanju vrednosti izmerene veličine u samo jednoj tački.U okviru ove disertacije sprovedena su eksperimentalna istraživanja, sa ciljem da sepokaže da je moguće primeniti relativno novu metodu digitalne korelacije slika naispitivanje opreme pod pritiskom. Metoda digitalne korelacije slika omogućava merenjacelih polja deformacija, pri čemu se jednim eksperimentalnim merenjem dobija veliki brojpodataka koji zamenjuje više desetina mernih traka.Trodimenzionalni optički sistem GOM i softver ARAMIS primenjeni su zaizvođenje eksperimentalne analize međusobnog uticaja priključaka na cilindrični omotačposude pod pritiskom, izložene unutrašnjem pritisku. Eksperimentalna istraživanja suobavljena na jednoj posudi pod pritiskom, na čiji su cilindrični omotač sa jedne stranezavarena dva cilindrična priključka, dimenzija DN 50 i DN 32. Sa druge strane omotačapod uglom od 180°, zavarena su dva priključka dimenzija DN 50. Definisana su dva mernamesta. Merno mesto 1 predstavlja oblast između dva priključka različitih dimenzija, amerno mesto 2 predstavlja oblast između dva priključka istih dimenzija. U okviru mernihmesta definisana su i merna polja pomoću kojih se dobija bolja slika o deformacionompolju između priključaka. Eksperimentalno merenje celih polja deformacija omogućavaprecizno određivanje kritičnih mesta, odnosno mesta najvećih deformacija...
AB  - Most of the researchers which deal with the problematic of determining andmeasuring stress and strain on the pressure vessels, focuse on the analyses of a nozzleinfluence on stresses and strains on the vessel cylindrical shell. Previous studies haverelied on analytical calculations based on shell theory, numerical calculations andconventional experimental methods. The most commonly used conventional method isstrain gauge method. The limitations of this method are reflected in local stress and strainmeasurement and obtaining values measured in a single point.In the framework of this dissertation, experimental researches were conducted, withthe goal to show that it is possible to apply a relatively new method of digital imagecorrelation, in testing of pressure equipment. Digital image correlation method enables themeasurement of the whole strain filed, whereby one experimental measurement provides alot of data which replace dozens of strain gauges.Three-dimensional optical system GOM and ARAMIS softwer are applied toperform experimental analyses of nozzles interaction influence on cylindrical shell of thepressure vessel, subjected to internal pressure. Experimental studies were carried out on apressure vessel, where two cylindrical nozzles were welded on one side of the cylindricalshell, with dimensions DN 50 and DN 32. On the other side of the shell, at the angle of180°, two nozzles with dimensions DN 50, were welded. Two measuring area wereidentified. Measuring area 1 represent the zone between two nozzles with differentdimensions, and measuring area 2 represent the zone between two nozzles of the samedimensions. Within the measuring areas, measuring fields are defined to obtaine betterpicture of the strain field between nozzles. Experimental measurement of whole strain fieldenables precise determination of critical points, i.e. point of highest strain...
PB  - Универзитет у Београду, Машински факултет
T2  - Универзитет у Београду
T1  - Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom
T1  - Nozzles interaction influence on stress state and strains on cylindrical shell of the pressure vessel
UR  - https://hdl.handle.net/21.15107/rcub_nardus_6234
ER  - 

@phdthesis{
author = "Balać, Martina",
year = "2014",
abstract = "Većina istraživača koja se bavi problematikom određivanja i merenja napona ideformacija na posudama pod pritiskom, fokusirala se na analizu uticaja jednog priključkana napone i deformacije na posudi. Dosadašnja istraživanja su se oslanjala na analitičkeproračune bazirane na teoriji ljuske, numeričke proračune i konvencionalneeksperimentalne metode. Najčešće korišćena konvencionalna metoda je metoda mernihtraka. Ograničenja ove metode se ogledaju u lokalnom merenju napona i deformacija, idobijanju vrednosti izmerene veličine u samo jednoj tački.U okviru ove disertacije sprovedena su eksperimentalna istraživanja, sa ciljem da sepokaže da je moguće primeniti relativno novu metodu digitalne korelacije slika naispitivanje opreme pod pritiskom. Metoda digitalne korelacije slika omogućava merenjacelih polja deformacija, pri čemu se jednim eksperimentalnim merenjem dobija veliki brojpodataka koji zamenjuje više desetina mernih traka.Trodimenzionalni optički sistem GOM i softver ARAMIS primenjeni su zaizvođenje eksperimentalne analize međusobnog uticaja priključaka na cilindrični omotačposude pod pritiskom, izložene unutrašnjem pritisku. Eksperimentalna istraživanja suobavljena na jednoj posudi pod pritiskom, na čiji su cilindrični omotač sa jedne stranezavarena dva cilindrična priključka, dimenzija DN 50 i DN 32. Sa druge strane omotačapod uglom od 180°, zavarena su dva priključka dimenzija DN 50. Definisana su dva mernamesta. Merno mesto 1 predstavlja oblast između dva priključka različitih dimenzija, amerno mesto 2 predstavlja oblast između dva priključka istih dimenzija. U okviru mernihmesta definisana su i merna polja pomoću kojih se dobija bolja slika o deformacionompolju između priključaka. Eksperimentalno merenje celih polja deformacija omogućavaprecizno određivanje kritičnih mesta, odnosno mesta najvećih deformacija..., Most of the researchers which deal with the problematic of determining andmeasuring stress and strain on the pressure vessels, focuse on the analyses of a nozzleinfluence on stresses and strains on the vessel cylindrical shell. Previous studies haverelied on analytical calculations based on shell theory, numerical calculations andconventional experimental methods. The most commonly used conventional method isstrain gauge method. The limitations of this method are reflected in local stress and strainmeasurement and obtaining values measured in a single point.In the framework of this dissertation, experimental researches were conducted, withthe goal to show that it is possible to apply a relatively new method of digital imagecorrelation, in testing of pressure equipment. Digital image correlation method enables themeasurement of the whole strain filed, whereby one experimental measurement provides alot of data which replace dozens of strain gauges.Three-dimensional optical system GOM and ARAMIS softwer are applied toperform experimental analyses of nozzles interaction influence on cylindrical shell of thepressure vessel, subjected to internal pressure. Experimental studies were carried out on apressure vessel, where two cylindrical nozzles were welded on one side of the cylindricalshell, with dimensions DN 50 and DN 32. On the other side of the shell, at the angle of180°, two nozzles with dimensions DN 50, were welded. Two measuring area wereidentified. Measuring area 1 represent the zone between two nozzles with differentdimensions, and measuring area 2 represent the zone between two nozzles of the samedimensions. Within the measuring areas, measuring fields are defined to obtaine betterpicture of the strain field between nozzles. Experimental measurement of whole strain fieldenables precise determination of critical points, i.e. point of highest strain...",
publisher = "Универзитет у Београду, Машински факултет",
journal = "Универзитет у Београду",
title = "Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom, Nozzles interaction influence on stress state and strains on cylindrical shell of the pressure vessel",
url = "https://hdl.handle.net/21.15107/rcub_nardus_6234"
}

Balać, M.. (2014). Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom. in Универзитет у Београду
Универзитет у Београду, Машински факултет..
https://hdl.handle.net/21.15107/rcub_nardus_6234

Balać M. Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom. in Универзитет у Београду. 2014;.
https://hdl.handle.net/21.15107/rcub_nardus_6234 .

Balać, Martina, "Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom" in Универзитет у Београду (2014),
https://hdl.handle.net/21.15107/rcub_nardus_6234 .

TY  - THES
AU  - Mitrović, Nenad
PY  - 2013
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=458
UR  - https://nardus.mpn.gov.rs/handle/123456789/2275
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:6299/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=514338723
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/19
AB  - Dosadašnja istraživanja u oblasti opreme pod pritiskom, odnosno merenja i određivanja napona i deformacija struktura kompleksne geometrije su se oslanjala na analitičke proračune najčešće bazirane na teoriji ljuski, numeričke proračune upotrebom računarskih softvera i konvencionalne eksperimentalne metode. Kao jedan od najčešćih zaključaka u svojim radovima, istraživači su naveli nepostojanje adekvatnih eksperimentalnih rezultata u postojećoj literaturi, odnosno iskazali potrebu za detaljnom eksperimentalnom analizom kritičnih mesta za koje nije moguće precizno odrediti veličine pomeranja, deformacija ili napona upotrebom analitičkih obrazaca ili numeričkih modela. Ograničenja korišćenih eksperimentalnih metoda su se ogledala u više aspekata. Prvo, za analizu geometrijskih diskontinuiteta, najčešće su korišćene standardizovane epruvete sa pripremljenim diskontinuitetima i ispitivane na zatezanje. Na osnovu dobijenih rezultata su pravljeni dijagrami sa faktorima koncentracije napona, koji su kasnije primenjivani na probleme geometrijski kompleksnih struktura. Ovakav pristup je davao samo okvirna rešenja, koja nisu bila dovoljno precizna i tačna. Drugo, eksperimenti su sprovođeni konvencionalnim metodama. Ograničenje konvencionalnih metoda je lokalno merenje, odnosno dobijanje vrednosti merenih veličina samo u jednoj tački. Treće, merenja su vršena samo u blizini geometrijskih diskontinuiteta, a ne na samim spojevima geometrijskih oblika, tako da nije bilo moguće merenje najvećih vrednosti deformacija. Jedan od ciljeva ove teze je upravo taj da prevaziđe navedene eksperimentalne probleme, odnosno da pokaže da je moguće primeniti relativno novu metodu digitalne korelacije slika na slučajeve ispitivanja struktura kompleksne geometrije u oblasti cevovodne armature. Metoda korelacije digitalnih slika, prevazilazi ograničenja metode mernih traka, kao najčešće korišćene konvencionalne metode i omogućava merenje Naponi i deformacije struktura kompleksne geometrije cevovodne armature iii celih polja pomeranja i deformacija. Jednim eksperimentalnim merenjem se dobija veliki broj podataka koja zamenjuje više desetina/stotina mernih traka i značajno smanjuje vreme pripreme eksperimenta, a samim tim i troškove. S druge strane, kako se metodom konačnih elemenata dobija kompletno polje pomeranja i deformacija, sama verifikacija numeričkog modelase mnogo jednostavnije sprovodi poređenjem sa rezultatima koji su predstavljeni na isti način. Eksperimentalno merenje celih polja deformacija omogućuje precizno određivanje mesta kritičnih, odnosno najvećih deformacija, kao i pravce glavnih deformacija koje omogućava bolju teorijsku analizu kompleksnih struktura.
AB  - Previous studies in the field of pressure equipment, i.e. measuring and determining stress and strain of geometrically complex structures, have relied on analytical calculations based on shell theory, numerical calculations using computer software and conventional experimental methods. As one of the most often conclusions in their work, the researchers indicated the lack of adequate experimental data in the available literature, i.e. expressed the need for detailed experimental analysis of critical areas where is not possible to precisely determine displacement, strain and stress values using analytical or numerical models. Limitations of used experimental methods were recognized in several aspects. First, standardized specimens with discontinuities were used for analysis of geometrical discontinuities and tensile testing. Based on the results of tensile testing, stress concentration factors were plotted on diagrams and later used to solve problems on geometrically complex structures. This approach gave only approximate solutions that are not sufficiently precise and accurate. Second, experiments were conducted using conventional methods. Limitation of conventional methods is local measurement, i.e. experimental values are measured only in a single point. Third, measurements were carried out close to the geometrical discontinuity, rather than on the actual intersection of geometrical shapes, so it was not possible to measure highest strain values. One of the goals of the thesis is exactly that to overcome abovementioned experimental problems, i.e. to show that is possible to implement relatively new digital image correlation method on testing geometrically complex structures in the field of pipeline fittings. Digital image correlation method overcomes limitations of strain gauge, as the strain gauge is most commonly used conventional method that enables full-field displacement and strain measurement. One experimental measurement enables acquisition of large datasets that replaces dozens/hundreds of strain gauges and Naponi i deformacije struktura kompleksne geometrije cevovodne armature vi significantly reduces experiment preparation time and therefore the costs. On the other hand, as finite element method calculates full displacement and strain fields, numerical model verification is easily carried out by comparing to experimental results presented in the same manner. Full strain field experimental measurement allows accurate determination of critical areas, i.e. areas with highest strain values, as well as principle stress directions that enables better theoretical analysis of complex structures.
PB  - Univerzitet u Beogradu, Mašinski fakultet
T1  - Naponi i deformacije struktura kompleksne geometrije cevovodne armature
T1  - Stresses and strains of geometrically complex structures of pipeline fittings
UR  - https://hdl.handle.net/21.15107/rcub_nardus_2275
ER  - 

@phdthesis{
author = "Mitrović, Nenad",
year = "2013",
abstract = "Dosadašnja istraživanja u oblasti opreme pod pritiskom, odnosno merenja i određivanja napona i deformacija struktura kompleksne geometrije su se oslanjala na analitičke proračune najčešće bazirane na teoriji ljuski, numeričke proračune upotrebom računarskih softvera i konvencionalne eksperimentalne metode. Kao jedan od najčešćih zaključaka u svojim radovima, istraživači su naveli nepostojanje adekvatnih eksperimentalnih rezultata u postojećoj literaturi, odnosno iskazali potrebu za detaljnom eksperimentalnom analizom kritičnih mesta za koje nije moguće precizno odrediti veličine pomeranja, deformacija ili napona upotrebom analitičkih obrazaca ili numeričkih modela. Ograničenja korišćenih eksperimentalnih metoda su se ogledala u više aspekata. Prvo, za analizu geometrijskih diskontinuiteta, najčešće su korišćene standardizovane epruvete sa pripremljenim diskontinuitetima i ispitivane na zatezanje. Na osnovu dobijenih rezultata su pravljeni dijagrami sa faktorima koncentracije napona, koji su kasnije primenjivani na probleme geometrijski kompleksnih struktura. Ovakav pristup je davao samo okvirna rešenja, koja nisu bila dovoljno precizna i tačna. Drugo, eksperimenti su sprovođeni konvencionalnim metodama. Ograničenje konvencionalnih metoda je lokalno merenje, odnosno dobijanje vrednosti merenih veličina samo u jednoj tački. Treće, merenja su vršena samo u blizini geometrijskih diskontinuiteta, a ne na samim spojevima geometrijskih oblika, tako da nije bilo moguće merenje najvećih vrednosti deformacija. Jedan od ciljeva ove teze je upravo taj da prevaziđe navedene eksperimentalne probleme, odnosno da pokaže da je moguće primeniti relativno novu metodu digitalne korelacije slika na slučajeve ispitivanja struktura kompleksne geometrije u oblasti cevovodne armature. Metoda korelacije digitalnih slika, prevazilazi ograničenja metode mernih traka, kao najčešće korišćene konvencionalne metode i omogućava merenje Naponi i deformacije struktura kompleksne geometrije cevovodne armature iii celih polja pomeranja i deformacija. Jednim eksperimentalnim merenjem se dobija veliki broj podataka koja zamenjuje više desetina/stotina mernih traka i značajno smanjuje vreme pripreme eksperimenta, a samim tim i troškove. S druge strane, kako se metodom konačnih elemenata dobija kompletno polje pomeranja i deformacija, sama verifikacija numeričkog modelase mnogo jednostavnije sprovodi poređenjem sa rezultatima koji su predstavljeni na isti način. Eksperimentalno merenje celih polja deformacija omogućuje precizno određivanje mesta kritičnih, odnosno najvećih deformacija, kao i pravce glavnih deformacija koje omogućava bolju teorijsku analizu kompleksnih struktura., Previous studies in the field of pressure equipment, i.e. measuring and determining stress and strain of geometrically complex structures, have relied on analytical calculations based on shell theory, numerical calculations using computer software and conventional experimental methods. As one of the most often conclusions in their work, the researchers indicated the lack of adequate experimental data in the available literature, i.e. expressed the need for detailed experimental analysis of critical areas where is not possible to precisely determine displacement, strain and stress values using analytical or numerical models. Limitations of used experimental methods were recognized in several aspects. First, standardized specimens with discontinuities were used for analysis of geometrical discontinuities and tensile testing. Based on the results of tensile testing, stress concentration factors were plotted on diagrams and later used to solve problems on geometrically complex structures. This approach gave only approximate solutions that are not sufficiently precise and accurate. Second, experiments were conducted using conventional methods. Limitation of conventional methods is local measurement, i.e. experimental values are measured only in a single point. Third, measurements were carried out close to the geometrical discontinuity, rather than on the actual intersection of geometrical shapes, so it was not possible to measure highest strain values. One of the goals of the thesis is exactly that to overcome abovementioned experimental problems, i.e. to show that is possible to implement relatively new digital image correlation method on testing geometrically complex structures in the field of pipeline fittings. Digital image correlation method overcomes limitations of strain gauge, as the strain gauge is most commonly used conventional method that enables full-field displacement and strain measurement. One experimental measurement enables acquisition of large datasets that replaces dozens/hundreds of strain gauges and Naponi i deformacije struktura kompleksne geometrije cevovodne armature vi significantly reduces experiment preparation time and therefore the costs. On the other hand, as finite element method calculates full displacement and strain fields, numerical model verification is easily carried out by comparing to experimental results presented in the same manner. Full strain field experimental measurement allows accurate determination of critical areas, i.e. areas with highest strain values, as well as principle stress directions that enables better theoretical analysis of complex structures.",
publisher = "Univerzitet u Beogradu, Mašinski fakultet",
title = "Naponi i deformacije struktura kompleksne geometrije cevovodne armature, Stresses and strains of geometrically complex structures of pipeline fittings",
url = "https://hdl.handle.net/21.15107/rcub_nardus_2275"
}

Mitrović, N.. (2013). Naponi i deformacije struktura kompleksne geometrije cevovodne armature. 
Univerzitet u Beogradu, Mašinski fakultet..
https://hdl.handle.net/21.15107/rcub_nardus_2275

Mitrović N. Naponi i deformacije struktura kompleksne geometrije cevovodne armature. 2013;.
https://hdl.handle.net/21.15107/rcub_nardus_2275 .

Mitrović, Nenad, "Naponi i deformacije struktura kompleksne geometrije cevovodne armature" (2013),
https://hdl.handle.net/21.15107/rcub_nardus_2275 .

TY  - JOUR
AU  - Đapić, Mirko
AU  - Popović, Predrag
AU  - Lukić, Ljubomir
AU  - Mitrović, Radivoje
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1361
AB  - Evropska Unija je početkom devedesetih godina prošlog veka, kroz uvođenje Novog i Globalnog pristupa tehničkoj harmonizaciji i standardizaciji, ostvarila značajno unapređenje u postupku ocenjivanja usaglašenosti proizvoda na taj način što je zahteve za bezbednost tehničkih proizvoda integrisala u proces projektovanja. To je postignuto tako što se u procesu projektovanja preventivno analiziraju i kvantifikuju nivoi rizika u cilju određivanja obima potrebnih sistema bezbednosti. S druge strane, svedoci smo rapidnog razvoja i implementacije holističkih pristupa upravljanju rizicima u preduzeću koji je u savremenoj poslovnoj praksi objedinjen nazivom Menadžment rizika preduzeća (ERM - Enterprise Risk Menagment). Sledeći to u radu se preko osnova Novog i Globalnog pristupa Evropske Unije predstavlja koncept ocene rizika u direktivama Novog pristupa (mašinska, ATEX, liftovi) i daje koncept njegove integracije u holistički pristup upravljanju rizicima u preduzeću kakav je ERM.
AB  - In the nineties years of the previous century, the European Union achieved, through introducing the New and Global Approach to technical harmonization and standardization, a significant improvement in the approach to conformity assessment of products, by integrating the requirements for technical products safety into the process of its designing. This was achieved by preventive analyzing and quantifying of risk levels in the design process with the objective of determining the scope of the needed safety systems. On the other hand, we have witnessed a rapid development and implementation of holistic approaches to risks management in enterprises, unified in the modern business practice by the name of Enterprise Risk Management (ERM). Going along that line, the paper presents, through the basis of the EU New and Global Approach, the concept of risk assessment in the New Approach directives (Machinery, Lifts, ATEX, etc) and provides the concept of its integration into the holistic approach of risks management in enterprises, such as ERM.
PB  - Ekonomski institut, Beograd
T2  - Industrija
T1  - Risk assessment concept in the new approach directives and its integration in the Enterprise Risk Management (ERM)
EP  - 38
IS  - 1
SP  - 3
VL  - 40
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1361
ER  - 

@article{
author = "Đapić, Mirko and Popović, Predrag and Lukić, Ljubomir and Mitrović, Radivoje",
year = "2012",
abstract = "Evropska Unija je početkom devedesetih godina prošlog veka, kroz uvođenje Novog i Globalnog pristupa tehničkoj harmonizaciji i standardizaciji, ostvarila značajno unapređenje u postupku ocenjivanja usaglašenosti proizvoda na taj način što je zahteve za bezbednost tehničkih proizvoda integrisala u proces projektovanja. To je postignuto tako što se u procesu projektovanja preventivno analiziraju i kvantifikuju nivoi rizika u cilju određivanja obima potrebnih sistema bezbednosti. S druge strane, svedoci smo rapidnog razvoja i implementacije holističkih pristupa upravljanju rizicima u preduzeću koji je u savremenoj poslovnoj praksi objedinjen nazivom Menadžment rizika preduzeća (ERM - Enterprise Risk Menagment). Sledeći to u radu se preko osnova Novog i Globalnog pristupa Evropske Unije predstavlja koncept ocene rizika u direktivama Novog pristupa (mašinska, ATEX, liftovi) i daje koncept njegove integracije u holistički pristup upravljanju rizicima u preduzeću kakav je ERM., In the nineties years of the previous century, the European Union achieved, through introducing the New and Global Approach to technical harmonization and standardization, a significant improvement in the approach to conformity assessment of products, by integrating the requirements for technical products safety into the process of its designing. This was achieved by preventive analyzing and quantifying of risk levels in the design process with the objective of determining the scope of the needed safety systems. On the other hand, we have witnessed a rapid development and implementation of holistic approaches to risks management in enterprises, unified in the modern business practice by the name of Enterprise Risk Management (ERM). Going along that line, the paper presents, through the basis of the EU New and Global Approach, the concept of risk assessment in the New Approach directives (Machinery, Lifts, ATEX, etc) and provides the concept of its integration into the holistic approach of risks management in enterprises, such as ERM.",
publisher = "Ekonomski institut, Beograd",
journal = "Industrija",
title = "Risk assessment concept in the new approach directives and its integration in the Enterprise Risk Management (ERM)",
pages = "38-3",
number = "1",
volume = "40",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1361"
}

Đapić, M., Popović, P., Lukić, L.,& Mitrović, R.. (2012). Risk assessment concept in the new approach directives and its integration in the Enterprise Risk Management (ERM). in Industrija
Ekonomski institut, Beograd., 40(1), 3-38.
https://hdl.handle.net/21.15107/rcub_machinery_1361

Đapić M, Popović P, Lukić L, Mitrović R. Risk assessment concept in the new approach directives and its integration in the Enterprise Risk Management (ERM). in Industrija. 2012;40(1):3-38.
https://hdl.handle.net/21.15107/rcub_machinery_1361 .

Đapić, Mirko, Popović, Predrag, Lukić, Ljubomir, Mitrović, Radivoje, "Risk assessment concept in the new approach directives and its integration in the Enterprise Risk Management (ERM)" in Industrija, 40, no. 1 (2012):3-38,
https://hdl.handle.net/21.15107/rcub_machinery_1361 .

TY  - JOUR
AU  - Djapić, Mirko
AU  - Popović, Predrag
AU  - Lukić, Ljubomir
AU  - Mitrović, Radivoje
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1430
AB  - In the nineties years of the previous century, the European Union achieved, through introducing the New and Global Approach to technical harmonization and standardization, a significant improvement in the approach to conformity assessment of products, by integrating the requirements for technical products safety into the process of its designing. This was achieved by preventive analyzing and quantifying of risk levels in the design process with the objective of determining the scope of the needed safety systems. On the other hand, we have witnessed a rapid development and implementation of holistic approaches to risks management in enterprises, unified in the modem business practice by the name of Enterprise Risk Management (ERM). Going along that line, the paper presents basis of the E,U New and Global Approach and give an approach to integrating New Approach Directives risk assessment into the holistic approach of risks management in organization, such as ERM.
PB  - Drunpp-Sarajevo, Sarajevo
T2  - Technics Technologies Education Management-Ttem
T1  - Integrating Risk Assessment in the NAD into the ERM Model
EP  - 1054
IS  - 3
SP  - 1044
VL  - 7
UR  - https://hdl.handle.net/21.15107/rcub_vinar_5145
ER  - 

@article{
author = "Djapić, Mirko and Popović, Predrag and Lukić, Ljubomir and Mitrović, Radivoje",
year = "2012",
abstract = "In the nineties years of the previous century, the European Union achieved, through introducing the New and Global Approach to technical harmonization and standardization, a significant improvement in the approach to conformity assessment of products, by integrating the requirements for technical products safety into the process of its designing. This was achieved by preventive analyzing and quantifying of risk levels in the design process with the objective of determining the scope of the needed safety systems. On the other hand, we have witnessed a rapid development and implementation of holistic approaches to risks management in enterprises, unified in the modem business practice by the name of Enterprise Risk Management (ERM). Going along that line, the paper presents basis of the E,U New and Global Approach and give an approach to integrating New Approach Directives risk assessment into the holistic approach of risks management in organization, such as ERM.",
publisher = "Drunpp-Sarajevo, Sarajevo",
journal = "Technics Technologies Education Management-Ttem",
title = "Integrating Risk Assessment in the NAD into the ERM Model",
pages = "1054-1044",
number = "3",
volume = "7",
url = "https://hdl.handle.net/21.15107/rcub_vinar_5145"
}

Djapić, M., Popović, P., Lukić, L.,& Mitrović, R.. (2012). Integrating Risk Assessment in the NAD into the ERM Model. in Technics Technologies Education Management-Ttem
Drunpp-Sarajevo, Sarajevo., 7(3), 1044-1054.
https://hdl.handle.net/21.15107/rcub_vinar_5145

Djapić M, Popović P, Lukić L, Mitrović R. Integrating Risk Assessment in the NAD into the ERM Model. in Technics Technologies Education Management-Ttem. 2012;7(3):1044-1054.
https://hdl.handle.net/21.15107/rcub_vinar_5145 .

Djapić, Mirko, Popović, Predrag, Lukić, Ljubomir, Mitrović, Radivoje, "Integrating Risk Assessment in the NAD into the ERM Model" in Technics Technologies Education Management-Ttem, 7, no. 3 (2012):1044-1054,
https://hdl.handle.net/21.15107/rcub_vinar_5145 .

TY  - JOUR
AU  - Popović, Predrag
AU  - Mitrović, Radivoje
AU  - Jelić, Miloš
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1255
AB  - Za dugoročno održiv ekonomski rast potrebno je neprekidno jačanje konkurentnosti domaće privrede, rast investicionih aktivnosti, uvođenje novih proizvoda i tehnologija, kao i unapređenje pravnog i institucionalnog okvira za budući razvoj. Republika Srbija zaostaje u oblasti infrastrukture, institucija i makroekonomske stabilnosti. Razvoj i unapređenje pravnog i institucionalnog okvira za standardizaciju, akreditaciju, metrologiju, ocenjivanje usaglašenosti i nadzor tržišta, odnosno infrastrukture kvaliteta jeste prioritetan zadatak države u cilju konkurentnosti srpske privrede. Značajni rezultati su postignuti u prethodne dve godine, međutim, evidentni su i određeni propusti, pre svega u nesinhronizovanom donošenju tehničkih propisa i njihovoj implementaciji.
AB  - For long-term sustainable economic growth it is necessary to continuously strengthen the competitiveness of the domestic economy, the growth of investment activity, the introduction of new products and technologies, as well as to improve the legal and institutional framework for future development. Republic of Serbia is lagging behind in infrastructure, institutions and macroeconomic stability. Development and improvement of the legal and institutional framework for standardization, accreditation, metrology, conformity assessment, and market surveillance and quality infrastructure is a national priority task to the make Serbian economy competitive. Significant results were achieved in the last two years. However, certain omissions are evident, particularly in unsynchronized adoption of technical regulations and their implementation.
PB  - Ekonomski institut, Beograd
T2  - Industrija
T1  - Razvoj nacionalne infrastrukture kvaliteta
T1  - The development of national quality infrastructure
EP  - 245
IS  - 3
SP  - 223
VL  - 39
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1255
ER  - 

@article{
author = "Popović, Predrag and Mitrović, Radivoje and Jelić, Miloš",
year = "2011",
abstract = "Za dugoročno održiv ekonomski rast potrebno je neprekidno jačanje konkurentnosti domaće privrede, rast investicionih aktivnosti, uvođenje novih proizvoda i tehnologija, kao i unapređenje pravnog i institucionalnog okvira za budući razvoj. Republika Srbija zaostaje u oblasti infrastrukture, institucija i makroekonomske stabilnosti. Razvoj i unapređenje pravnog i institucionalnog okvira za standardizaciju, akreditaciju, metrologiju, ocenjivanje usaglašenosti i nadzor tržišta, odnosno infrastrukture kvaliteta jeste prioritetan zadatak države u cilju konkurentnosti srpske privrede. Značajni rezultati su postignuti u prethodne dve godine, međutim, evidentni su i određeni propusti, pre svega u nesinhronizovanom donošenju tehničkih propisa i njihovoj implementaciji., For long-term sustainable economic growth it is necessary to continuously strengthen the competitiveness of the domestic economy, the growth of investment activity, the introduction of new products and technologies, as well as to improve the legal and institutional framework for future development. Republic of Serbia is lagging behind in infrastructure, institutions and macroeconomic stability. Development and improvement of the legal and institutional framework for standardization, accreditation, metrology, conformity assessment, and market surveillance and quality infrastructure is a national priority task to the make Serbian economy competitive. Significant results were achieved in the last two years. However, certain omissions are evident, particularly in unsynchronized adoption of technical regulations and their implementation.",
publisher = "Ekonomski institut, Beograd",
journal = "Industrija",
title = "Razvoj nacionalne infrastrukture kvaliteta, The development of national quality infrastructure",
pages = "245-223",
number = "3",
volume = "39",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1255"
}

Popović, P., Mitrović, R.,& Jelić, M.. (2011). Razvoj nacionalne infrastrukture kvaliteta. in Industrija
Ekonomski institut, Beograd., 39(3), 223-245.
https://hdl.handle.net/21.15107/rcub_machinery_1255

Popović P, Mitrović R, Jelić M. Razvoj nacionalne infrastrukture kvaliteta. in Industrija. 2011;39(3):223-245.
https://hdl.handle.net/21.15107/rcub_machinery_1255 .

Popović, Predrag, Mitrović, Radivoje, Jelić, Miloš, "Razvoj nacionalne infrastrukture kvaliteta" in Industrija, 39, no. 3 (2011):223-245,
https://hdl.handle.net/21.15107/rcub_machinery_1255 .