TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Živojinović, Danijela
AU  - Kreculj, Dragan
AU  - Ivanov, Toni
AU  - Baltić, Marija
AU  - Simonović, Aleksandar
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5419
AB  - Reverse engineering (RE) aims to design a new replacement part based on the existing part. The goal is to perform a quality reproduction of the physical part with the best possible mechanical characteristics aiming to find optimal solutions regarding the shape and dimensions of the part. The
procedure is implemented through a series of steps: creating a digital 3D model, improving model parameters, and realizing products using additive technologies. In this paper, a review and 
implementation of the fundamental methodologies of RE were carried out on the example of a damaged protective cover with an unknown geometry and material essential for the function of a discontinued device with no technical documentation and spare parts. An optical scanning method, 3D CAD, FEA, and additive manufacturing were used to realize the reproduced part. It was shown that by utilizing RE the lifecycle of the device could be significantly extended with minimal cost.
PB  - Faculty of Mechanical Engineering, Belgrade
T2  - FME Transactions
T1  - Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts
EP  - 38
IS  - 1
SP  - 31
VL  - 51
DO  - 10.5937/fme2301031V
ER  - 

@article{
author = "Vorkapić, Miloš and Živojinović, Danijela and Kreculj, Dragan and Ivanov, Toni and Baltić, Marija and Simonović, Aleksandar",
year = "2023",
abstract = "Reverse engineering (RE) aims to design a new replacement part based on the existing part. The goal is to perform a quality reproduction of the physical part with the best possible mechanical characteristics aiming to find optimal solutions regarding the shape and dimensions of the part. The
procedure is implemented through a series of steps: creating a digital 3D model, improving model parameters, and realizing products using additive technologies. In this paper, a review and 
implementation of the fundamental methodologies of RE were carried out on the example of a damaged protective cover with an unknown geometry and material essential for the function of a discontinued device with no technical documentation and spare parts. An optical scanning method, 3D CAD, FEA, and additive manufacturing were used to realize the reproduced part. It was shown that by utilizing RE the lifecycle of the device could be significantly extended with minimal cost.",
publisher = "Faculty of Mechanical Engineering, Belgrade",
journal = "FME Transactions",
title = "Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts",
pages = "38-31",
number = "1",
volume = "51",
doi = "10.5937/fme2301031V"
}

Vorkapić, M., Živojinović, D., Kreculj, D., Ivanov, T., Baltić, M.,& Simonović, A.. (2023). Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts. in FME Transactions
Faculty of Mechanical Engineering, Belgrade., 51(1), 31-38.
https://doi.org/10.5937/fme2301031V

Vorkapić M, Živojinović D, Kreculj D, Ivanov T, Baltić M, Simonović A. Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts. in FME Transactions. 2023;51(1):31-38.
doi:10.5937/fme2301031V .

Vorkapić, Miloš, Živojinović, Danijela, Kreculj, Dragan, Ivanov, Toni, Baltić, Marija, Simonović, Aleksandar, "Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts" in FME Transactions, 51, no. 1 (2023):31-38,
https://doi.org/10.5937/fme2301031V . .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Svoboda, Petr
AU  - Klančnik, Simon
AU  - But, Adrian
AU  - Vorkapić, Miloš
AU  - Harničárová, Marta
AU  - Stojanović, Blaža
PY  - 2023
UR  - https://www.mdpi.com/2075-4442/11/1/24
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7339
AB  - Three different and very small amounts of alumina (0.2, 0.3 and 0.5 wt. %) in two sizes (approx. 25 and 100 nm) were used to enhance the wear characteristics of ZA-27 alloy-based nanocomposites. Production was realised through mechanical alloying in pre-processing and compocasting processes. Wear tests were under lubricated sliding conditions on a block-on-disc tribometer, at two sliding speeds (0.25 and 1 m/s), two normal loads (40 and 100 N) and a sliding distance of 1000 m. Experimental results were analysed by applying the response surface methodology (RSM) and a suitable mathematical model for the wear rate of tested nanocomposites was developed. Appropriate wear maps were constructed and the wear mechanism is discussed in this paper. The accuracy of the prediction was evaluated with the use of an artificial neural network (ANN). The architecture of the used ANN was 4-5-1 and the obtained overall regression coefficient was 0.98729. The comparison of the predicting methods showed that ANN is more efficient in predicting wear.
T2  - Lubricants
T1  - Influence of Al2O3 nanoparticles addition in ZA-27 alloy-based nanocomposites and soft computing prediction
IS  - 1
SP  - 24
VL  - 11
DO  - 10.3390/lubricants11010024
ER  - 

@article{
author = "Vencl, Aleksandar and Svoboda, Petr and Klančnik, Simon and But, Adrian and Vorkapić, Miloš and Harničárová, Marta and Stojanović, Blaža",
year = "2023",
abstract = "Three different and very small amounts of alumina (0.2, 0.3 and 0.5 wt. %) in two sizes (approx. 25 and 100 nm) were used to enhance the wear characteristics of ZA-27 alloy-based nanocomposites. Production was realised through mechanical alloying in pre-processing and compocasting processes. Wear tests were under lubricated sliding conditions on a block-on-disc tribometer, at two sliding speeds (0.25 and 1 m/s), two normal loads (40 and 100 N) and a sliding distance of 1000 m. Experimental results were analysed by applying the response surface methodology (RSM) and a suitable mathematical model for the wear rate of tested nanocomposites was developed. Appropriate wear maps were constructed and the wear mechanism is discussed in this paper. The accuracy of the prediction was evaluated with the use of an artificial neural network (ANN). The architecture of the used ANN was 4-5-1 and the obtained overall regression coefficient was 0.98729. The comparison of the predicting methods showed that ANN is more efficient in predicting wear.",
journal = "Lubricants",
title = "Influence of Al2O3 nanoparticles addition in ZA-27 alloy-based nanocomposites and soft computing prediction",
number = "1",
pages = "24",
volume = "11",
doi = "10.3390/lubricants11010024"
}

Vencl, A., Svoboda, P., Klančnik, S., But, A., Vorkapić, M., Harničárová, M.,& Stojanović, B.. (2023). Influence of Al2O3 nanoparticles addition in ZA-27 alloy-based nanocomposites and soft computing prediction. in Lubricants, 11(1), 24.
https://doi.org/10.3390/lubricants11010024

Vencl A, Svoboda P, Klančnik S, But A, Vorkapić M, Harničárová M, Stojanović B. Influence of Al2O3 nanoparticles addition in ZA-27 alloy-based nanocomposites and soft computing prediction. in Lubricants. 2023;11(1):24.
doi:10.3390/lubricants11010024 .

Vencl, Aleksandar, Svoboda, Petr, Klančnik, Simon, But, Adrian, Vorkapić, Miloš, Harničárová, Marta, Stojanović, Blaža, "Influence of Al2O3 nanoparticles addition in ZA-27 alloy-based nanocomposites and soft computing prediction" in Lubricants, 11, no. 1 (2023):24,
https://doi.org/10.3390/lubricants11010024 . .

TY  - CONF
AU  - Tanović, Dragoljub
AU  - Vorkapić, Miloš
AU  - Telebak, Katarina
AU  - Stojanović, Jagoš
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7749
AB  - The rising cost of fossil fuels has prompted a shift towards environmentally friendly alternative energy sources, leading to an expansion in the study of renewables. Wind turbines, specially those of the small-scale variety, have emerged as a promising solution for generating sustainable electricity, particularly in rural areas and for smaller consumers. This study focuses on the analysis of pitch angles for three-bladed horizontal axis wind turbines (HAWT) with a diameter of 1.35 m, classified as micro wind turbines. The analysis assumes incompressible and viscous flow, with shear stress transport (SST) equations closed by various turbulence models. The ANSYS program was used for conducting this analysis.
C3  - International Conference of Experimental and Numerical Investigations and New Technologies
T1  - EFFECT OF PITCH ANGLE ON WIND TURBINE  PERFORMANCES
IS  - 68
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7749
ER  - 

@conference{
author = "Tanović, Dragoljub and Vorkapić, Miloš and Telebak, Katarina and Stojanović, Jagoš",
year = "2023",
abstract = "The rising cost of fossil fuels has prompted a shift towards environmentally friendly alternative energy sources, leading to an expansion in the study of renewables. Wind turbines, specially those of the small-scale variety, have emerged as a promising solution for generating sustainable electricity, particularly in rural areas and for smaller consumers. This study focuses on the analysis of pitch angles for three-bladed horizontal axis wind turbines (HAWT) with a diameter of 1.35 m, classified as micro wind turbines. The analysis assumes incompressible and viscous flow, with shear stress transport (SST) equations closed by various turbulence models. The ANSYS program was used for conducting this analysis.",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies",
title = "EFFECT OF PITCH ANGLE ON WIND TURBINE  PERFORMANCES",
number = "68",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7749"
}

Tanović, D., Vorkapić, M., Telebak, K.,& Stojanović, J.. (2023). EFFECT OF PITCH ANGLE ON WIND TURBINE  PERFORMANCES. in International Conference of Experimental and Numerical Investigations and New Technologies(68).
https://hdl.handle.net/21.15107/rcub_machinery_7749

Tanović D, Vorkapić M, Telebak K, Stojanović J. EFFECT OF PITCH ANGLE ON WIND TURBINE  PERFORMANCES. in International Conference of Experimental and Numerical Investigations and New Technologies. 2023;(68).
https://hdl.handle.net/21.15107/rcub_machinery_7749 .

Tanović, Dragoljub, Vorkapić, Miloš, Telebak, Katarina, Stojanović, Jagoš, "EFFECT OF PITCH ANGLE ON WIND TURBINE  PERFORMANCES" in International Conference of Experimental and Numerical Investigations and New Technologies, no. 68 (2023),
https://hdl.handle.net/21.15107/rcub_machinery_7749 .

TY  - CONF
AU  - Baltić, Marija
AU  - Ivanović, Milica
AU  - Tanović, Dragoljub
AU  - Vorkapić, Miloš
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7737
AB  - Biocomposite materials are a combination of two or more different biomaterials at the
macroscopic level, with competitive mechanical and insulation properties, relatively stable when
exposed to high temperatures and tailorable. In this paper, materials are with a vegetative part of
fungi (mycelium-mesh structure of hyphae) which are increasingly used to create biocomposites
with unique processing technology. The vegetative part of a fungus called mycelium, can serve as
a natural binder for products made of biocomposite and acts like a self-assembling adhesive by
digesting and adhering to the surface of specific organic matter. This paper presents the
development of mould technology to set the biocomposite structure and test its mechanical
characteristics. The primary purpose of the mould is to bring the loose natural material into a
solid preparation following the standards ASTM D7250 and ASTM D1037, which include testing
the technologically prepared and hardened sample for tensile and pressure. Development and
moulding of biocomposite are the technological processes of drying after sowing mycelium so a
variant of the mould with a perforated upper part was used to harden the samples thoroughly.
C3  - The Ninth International Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia
T1  - DEVELOPMENT AND MOULD TECHNOLOGY FOR TESTING OF BIOCOMPOSITE STRUCTURES (APPLICATION FOR THERMOINSULATED BIO PLATES)
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7737
ER  - 

@conference{
author = "Baltić, Marija and Ivanović, Milica and Tanović, Dragoljub and Vorkapić, Miloš",
year = "2023",
abstract = "Biocomposite materials are a combination of two or more different biomaterials at the
macroscopic level, with competitive mechanical and insulation properties, relatively stable when
exposed to high temperatures and tailorable. In this paper, materials are with a vegetative part of
fungi (mycelium-mesh structure of hyphae) which are increasingly used to create biocomposites
with unique processing technology. The vegetative part of a fungus called mycelium, can serve as
a natural binder for products made of biocomposite and acts like a self-assembling adhesive by
digesting and adhering to the surface of specific organic matter. This paper presents the
development of mould technology to set the biocomposite structure and test its mechanical
characteristics. The primary purpose of the mould is to bring the loose natural material into a
solid preparation following the standards ASTM D7250 and ASTM D1037, which include testing
the technologically prepared and hardened sample for tensile and pressure. Development and
moulding of biocomposite are the technological processes of drying after sowing mycelium so a
variant of the mould with a perforated upper part was used to harden the samples thoroughly.",
journal = "The Ninth International Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia",
title = "DEVELOPMENT AND MOULD TECHNOLOGY FOR TESTING OF BIOCOMPOSITE STRUCTURES (APPLICATION FOR THERMOINSULATED BIO PLATES)",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7737"
}

Baltić, M., Ivanović, M., Tanović, D.,& Vorkapić, M.. (2023). DEVELOPMENT AND MOULD TECHNOLOGY FOR TESTING OF BIOCOMPOSITE STRUCTURES (APPLICATION FOR THERMOINSULATED BIO PLATES). in The Ninth International Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia.
https://hdl.handle.net/21.15107/rcub_machinery_7737

Baltić M, Ivanović M, Tanović D, Vorkapić M. DEVELOPMENT AND MOULD TECHNOLOGY FOR TESTING OF BIOCOMPOSITE STRUCTURES (APPLICATION FOR THERMOINSULATED BIO PLATES). in The Ninth International Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_7737 .

Baltić, Marija, Ivanović, Milica, Tanović, Dragoljub, Vorkapić, Miloš, "DEVELOPMENT AND MOULD TECHNOLOGY FOR TESTING OF BIOCOMPOSITE STRUCTURES (APPLICATION FOR THERMOINSULATED BIO PLATES)" in The Ninth International Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia (2023),
https://hdl.handle.net/21.15107/rcub_machinery_7737 .

TY  - CONF
AU  - Baltić, Marija
AU  - Ivanović, Milica
AU  - Tanović, Dragoljub
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7272
AB  - This paper presents the static testing of the composite material’s mechanical characteristics. An overview of the standards is made by which various tests are performed, and then an analysis of the results of the parameters obtained by the conventional method-stretching and optical (DIC system-bending) of carbon epoxy composite structures is given. These results represented the basis for the preparation and further application of biocomposite materials; that is, the testing procedure will be performed identically on composites containing mycelia. The mould for pressing biomaterial connected with mycelium is made of two parts. The primary purpose of the mould is to bring the loose natural material into a solid preparation following the standards ASTM D3039 and ASTM D7078, which include testing the technologically prepared and hardened sample for bending and shearing.
PB  - Springer, Cham
C3  - Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham.
T1  - Procedures in Testing the Mechanical Characteristics of Composite Structures and the Possibility of Application to Biodegradable Materials: An Overview
DO  - 10.1007/978-3-031-42041-2_31
ER  - 

@conference{
author = "Baltić, Marija and Ivanović, Milica and Tanović, Dragoljub and Vorkapić, Miloš and Mladenović, Ivana",
year = "2023",
abstract = "This paper presents the static testing of the composite material’s mechanical characteristics. An overview of the standards is made by which various tests are performed, and then an analysis of the results of the parameters obtained by the conventional method-stretching and optical (DIC system-bending) of carbon epoxy composite structures is given. These results represented the basis for the preparation and further application of biocomposite materials; that is, the testing procedure will be performed identically on composites containing mycelia. The mould for pressing biomaterial connected with mycelium is made of two parts. The primary purpose of the mould is to bring the loose natural material into a solid preparation following the standards ASTM D3039 and ASTM D7078, which include testing the technologically prepared and hardened sample for bending and shearing.",
publisher = "Springer, Cham",
journal = "Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham.",
title = "Procedures in Testing the Mechanical Characteristics of Composite Structures and the Possibility of Application to Biodegradable Materials: An Overview",
doi = "10.1007/978-3-031-42041-2_31"
}

Baltić, M., Ivanović, M., Tanović, D., Vorkapić, M.,& Mladenović, I.. (2023). Procedures in Testing the Mechanical Characteristics of Composite Structures and the Possibility of Application to Biodegradable Materials: An Overview. in Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham.
Springer, Cham..
https://doi.org/10.1007/978-3-031-42041-2_31

Baltić M, Ivanović M, Tanović D, Vorkapić M, Mladenović I. Procedures in Testing the Mechanical Characteristics of Composite Structures and the Possibility of Application to Biodegradable Materials: An Overview. in Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham.. 2023;.
doi:10.1007/978-3-031-42041-2_31 .

Baltić, Marija, Ivanović, Milica, Tanović, Dragoljub, Vorkapić, Miloš, Mladenović, Ivana, "Procedures in Testing the Mechanical Characteristics of Composite Structures and the Possibility of Application to Biodegradable Materials: An Overview" in Novel Techniques in Maintenance, Repair, and Overhaul. ISATECH 2022. Sustainable Aviation. Springer, Cham. (2023),
https://doi.org/10.1007/978-3-031-42041-2_31 . .

TY  - GEN
AU  - Smiljanić, Milče
AU  - Vorkapić, Miloš
AU  - Cvetanović, Katarina
AU  - Milinković, Evgenija
AU  - Lazić, Žarko
AU  - Bošković, Marko V.
AU  - Svorcan, Jelena
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7072
T1  - Metoda za posmatranje i analizu protoka fluida u Si-Pyrex staklo opto-mikrofluidnim platformama
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7072
ER  - 

@misc{
author = "Smiljanić, Milče and Vorkapić, Miloš and Cvetanović, Katarina and Milinković, Evgenija and Lazić, Žarko and Bošković, Marko V. and Svorcan, Jelena",
year = "2023",
title = "Metoda za posmatranje i analizu protoka fluida u Si-Pyrex staklo opto-mikrofluidnim platformama",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7072"
}

Smiljanić, M., Vorkapić, M., Cvetanović, K., Milinković, E., Lazić, Ž., Bošković, M. V.,& Svorcan, J.. (2023). Metoda za posmatranje i analizu protoka fluida u Si-Pyrex staklo opto-mikrofluidnim platformama. .
https://hdl.handle.net/21.15107/rcub_machinery_7072

Smiljanić M, Vorkapić M, Cvetanović K, Milinković E, Lazić Ž, Bošković MV, Svorcan J. Metoda za posmatranje i analizu protoka fluida u Si-Pyrex staklo opto-mikrofluidnim platformama. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_7072 .

Smiljanić, Milče, Vorkapić, Miloš, Cvetanović, Katarina, Milinković, Evgenija, Lazić, Žarko, Bošković, Marko V., Svorcan, Jelena, "Metoda za posmatranje i analizu protoka fluida u Si-Pyrex staklo opto-mikrofluidnim platformama" (2023),
https://hdl.handle.net/21.15107/rcub_machinery_7072 .

TY  - CONF
AU  - Tanović, Dragoljub
AU  - Svorcan, Jelena
AU  - Ivanović, Milica
AU  - Baltić, Marija
AU  - Vorkapić, Miloš
AU  - Telebak, Katarina
AU  - Stojanović, Jagoš
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7747
AB  - The wind speed is one of the major parameter influencing the design of the wind turbine, which varies widely over the different part of the country and globe. So, significant research is going on for the design of wind turbine for low, medium and high wind speed. Currently, many researchers have started designing small-scale horizontal axis wind turbines (HAWT) in world, to adapt their use to households. The advantage is reflected in the simple and affordable construction, uninterrupted operation and satisfactory power that wind turbines create. An airfoil is defined as the cross section of a body that is placed in an airstream in order to produce a useful aerodynamic force in the most efficient manner possible. The cross sections of wings, propeller blades, windmill blades, compressor and turbine blades in a jet engine, and hydrofoils are example of airfoils. A computational study has been conducted on various airfoils to simulate flows at different Reynolds numbers (Re) and wind speed to provide understanding and guidance for other low Reynolds-number designs. The numerical computational method used in this study is a boundary element method (BEM) which is implemented in software Qblade. It is an alternative deterministic method which incorporates a mesh that is only located on the boundaries of the domain and hence are attractive for free surface problems. The airfoils investigated in this study include NACA 4412, NACA 63-415 and S809. Performances such as power, power coefficient and tip speed ratio were compared.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies
T1  - THE INFLUENCE OF THE REYNOLDS NUMBER ON THE  AIRFOILS
SP  - 63
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7747
ER  - 

@conference{
author = "Tanović, Dragoljub and Svorcan, Jelena and Ivanović, Milica and Baltić, Marija and Vorkapić, Miloš and Telebak, Katarina and Stojanović, Jagoš",
year = "2022",
abstract = "The wind speed is one of the major parameter influencing the design of the wind turbine, which varies widely over the different part of the country and globe. So, significant research is going on for the design of wind turbine for low, medium and high wind speed. Currently, many researchers have started designing small-scale horizontal axis wind turbines (HAWT) in world, to adapt their use to households. The advantage is reflected in the simple and affordable construction, uninterrupted operation and satisfactory power that wind turbines create. An airfoil is defined as the cross section of a body that is placed in an airstream in order to produce a useful aerodynamic force in the most efficient manner possible. The cross sections of wings, propeller blades, windmill blades, compressor and turbine blades in a jet engine, and hydrofoils are example of airfoils. A computational study has been conducted on various airfoils to simulate flows at different Reynolds numbers (Re) and wind speed to provide understanding and guidance for other low Reynolds-number designs. The numerical computational method used in this study is a boundary element method (BEM) which is implemented in software Qblade. It is an alternative deterministic method which incorporates a mesh that is only located on the boundaries of the domain and hence are attractive for free surface problems. The airfoils investigated in this study include NACA 4412, NACA 63-415 and S809. Performances such as power, power coefficient and tip speed ratio were compared.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies",
title = "THE INFLUENCE OF THE REYNOLDS NUMBER ON THE  AIRFOILS",
pages = "63",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7747"
}

Tanović, D., Svorcan, J., Ivanović, M., Baltić, M., Vorkapić, M., Telebak, K.,& Stojanović, J.. (2022). THE INFLUENCE OF THE REYNOLDS NUMBER ON THE  AIRFOILS. in International Conference of Experimental and Numerical Investigations and New Technologies
Innovation Center of Faculty of Mechanical Engineering., 63.
https://hdl.handle.net/21.15107/rcub_machinery_7747

Tanović D, Svorcan J, Ivanović M, Baltić M, Vorkapić M, Telebak K, Stojanović J. THE INFLUENCE OF THE REYNOLDS NUMBER ON THE  AIRFOILS. in International Conference of Experimental and Numerical Investigations and New Technologies. 2022;:63.
https://hdl.handle.net/21.15107/rcub_machinery_7747 .

Tanović, Dragoljub, Svorcan, Jelena, Ivanović, Milica, Baltić, Marija, Vorkapić, Miloš, Telebak, Katarina, Stojanović, Jagoš, "THE INFLUENCE OF THE REYNOLDS NUMBER ON THE  AIRFOILS" in International Conference of Experimental and Numerical Investigations and New Technologies (2022):63,
https://hdl.handle.net/21.15107/rcub_machinery_7747 .

TY  - CONF
AU  - Kovačević, Aleksandar
AU  - Ivanov, Toni
AU  - Simonović, Aleksandar
AU  - Vorkapić, Miloš
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5430
AB  - Veoma veliki porast upotrebe 3D štampe u poslednje dve decenije posledica je niza benefita koje ova proizvodna tehnologija nudi. U ovom radu analizirano je odstupanje geometrije štampanog modela u odnosu na CAD model. Izrada eksperimentalnog modela izvršena je metodom fuzionog taloženja filamenta (FDM) pri čemu je korišćen akrilonitril butadien stirol (ABS) materijal. Pokazano je kako se sa brojem iteracija odstupanje geometrije 3D štampanih modela u odnosu na CAD model smanjuje. U zaključku je dat pregled celokupnog procesa i preporuke u pogledu ograničenja upotrebe ove metode.
PB  - Uniiverzitet u Beogradu - Mašinski fakultet
C3  - Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
T1  - Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5430
ER  - 

@conference{
author = "Kovačević, Aleksandar and Ivanov, Toni and Simonović, Aleksandar and Vorkapić, Miloš",
year = "2022",
abstract = "Veoma veliki porast upotrebe 3D štampe u poslednje dve decenije posledica je niza benefita koje ova proizvodna tehnologija nudi. U ovom radu analizirano je odstupanje geometrije štampanog modela u odnosu na CAD model. Izrada eksperimentalnog modela izvršena je metodom fuzionog taloženja filamenta (FDM) pri čemu je korišćen akrilonitril butadien stirol (ABS) materijal. Pokazano je kako se sa brojem iteracija odstupanje geometrije 3D štampanih modela u odnosu na CAD model smanjuje. U zaključku je dat pregled celokupnog procesa i preporuke u pogledu ograničenja upotrebe ove metode.",
publisher = "Uniiverzitet u Beogradu - Mašinski fakultet",
journal = "Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference",
title = "Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5430"
}

Kovačević, A., Ivanov, T., Simonović, A.,& Vorkapić, M.. (2022). Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
Uniiverzitet u Beogradu - Mašinski fakultet..
https://hdl.handle.net/21.15107/rcub_machinery_5430

Kovačević A, Ivanov T, Simonović A, Vorkapić M. Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5430 .

Kovačević, Aleksandar, Ivanov, Toni, Simonović, Aleksandar, Vorkapić, Miloš, "Povećanje preciznosti izrade 3D štampanih delova primenom iterativne metode" in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5430 .

TY  - CONF
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Baltić, Marija
AU  - Živojinović, Danijela
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5428
AB  - Da bi se na 3D štampaču izradio model sa složenim dizajnom odličnog kvaliteta, treba posebnu pažnju posvetiti njegovim elementima. U radu su razmatrana tri fundamentalna elementa: glava štampača, mlaznica i radna podloga. Upravo ovi elementi su odgovorni za ispravan rad uređaja i dalju realizaciju modela. Održavanje i zadavanje parametara štampe u mnogome zavise od stanja uređaja i kvaliteta pripreme elemenata za ukupnu proceduru štampe. Ako kvalitet materijala ne odgovara mogu da se pojave problemi u realizaciji 3D modela. U radu su razmotreni i opisani pomenuti elementi. Ovim radom pokušano je da se sa aspekta kompromisa cene i kvaliteta izrade razmotri uloga vitalnih elementata 3D štampe u realizaciji modela.
PB  - Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet
C3  - Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija
T1  - Značaj komponenti 3D štampača na ukupan kvalitet izrade modela
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5428
ER  - 

@conference{
author = "Vorkapić, Miloš and Ivanov, Toni and Baltić, Marija and Živojinović, Danijela",
year = "2022",
abstract = "Da bi se na 3D štampaču izradio model sa složenim dizajnom odličnog kvaliteta, treba posebnu pažnju posvetiti njegovim elementima. U radu su razmatrana tri fundamentalna elementa: glava štampača, mlaznica i radna podloga. Upravo ovi elementi su odgovorni za ispravan rad uređaja i dalju realizaciju modela. Održavanje i zadavanje parametara štampe u mnogome zavise od stanja uređaja i kvaliteta pripreme elemenata za ukupnu proceduru štampe. Ako kvalitet materijala ne odgovara mogu da se pojave problemi u realizaciji 3D modela. U radu su razmotreni i opisani pomenuti elementi. Ovim radom pokušano je da se sa aspekta kompromisa cene i kvaliteta izrade razmotri uloga vitalnih elementata 3D štampe u realizaciji modela.",
publisher = "Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet",
journal = "Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija",
title = "Značaj komponenti 3D štampača na ukupan kvalitet izrade modela",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5428"
}

Vorkapić, M., Ivanov, T., Baltić, M.,& Živojinović, D.. (2022). Značaj komponenti 3D štampača na ukupan kvalitet izrade modela. in Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija
Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet..
https://hdl.handle.net/21.15107/rcub_machinery_5428

Vorkapić M, Ivanov T, Baltić M, Živojinović D. Značaj komponenti 3D štampača na ukupan kvalitet izrade modela. in Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5428 .

Vorkapić, Miloš, Ivanov, Toni, Baltić, Marija, Živojinović, Danijela, "Značaj komponenti 3D štampača na ukupan kvalitet izrade modela" in Zbornik radova sa konferencije JUSK - 2022, Beograd, Srbija (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5428 .

TY  - CONF
AU  - Vorkapić, Miloš
AU  - Baltić, Marija
AU  - Ivanov, Toni
AU  - Simonović, Aleksandar
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5422
AB  - This paper presents the 3D printing technology for various textile materials. The application of this technology is vital in manufacturing various clothing items, primarily for specific purposes: hikers, firefighters, soldiers, and athletes. The installation of sensors, life function parameters monitoring and the usage of the new materials are the basis for the future development of the textile industry. Today, thermoplastic and textile materials are increasingly used in practice. Polylactic Acid (PLA) thermoplastic materials were used in the paper - in spool, Polyvinyl Chloride (PVC) and Nylon (in strips); while from textile materials, polyester, viscose and silk in the form of finished fabrics were considered. The technology of preparation of textile fibres for 3D printing using laser is shown. This technology makes it easier to combine textiles and molten filament. The pros and cons of joining different materials are discussed. Further research would go in the direction of making constructive solutions and testing the mechanical properties of various textile-polymer composites.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
T1  - The significance of 3D printing in textile-polymer composite structures realization for special purpose
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5422
ER  - 

@conference{
author = "Vorkapić, Miloš and Baltić, Marija and Ivanov, Toni and Simonović, Aleksandar",
year = "2022",
abstract = "This paper presents the 3D printing technology for various textile materials. The application of this technology is vital in manufacturing various clothing items, primarily for specific purposes: hikers, firefighters, soldiers, and athletes. The installation of sensors, life function parameters monitoring and the usage of the new materials are the basis for the future development of the textile industry. Today, thermoplastic and textile materials are increasingly used in practice. Polylactic Acid (PLA) thermoplastic materials were used in the paper - in spool, Polyvinyl Chloride (PVC) and Nylon (in strips); while from textile materials, polyester, viscose and silk in the form of finished fabrics were considered. The technology of preparation of textile fibres for 3D printing using laser is shown. This technology makes it easier to combine textiles and molten filament. The pros and cons of joining different materials are discussed. Further research would go in the direction of making constructive solutions and testing the mechanical properties of various textile-polymer composites.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia",
title = "The significance of 3D printing in textile-polymer composite structures realization for special purpose",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5422"
}

Vorkapić, M., Baltić, M., Ivanov, T.,& Simonović, A.. (2022). The significance of 3D printing in textile-polymer composite structures realization for special purpose. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering..
https://hdl.handle.net/21.15107/rcub_machinery_5422

Vorkapić M, Baltić M, Ivanov T, Simonović A. The significance of 3D printing in textile-polymer composite structures realization for special purpose. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5422 .

Vorkapić, Miloš, Baltić, Marija, Ivanov, Toni, Simonović, Aleksandar, "The significance of 3D printing in textile-polymer composite structures realization for special purpose" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5422 .

TY  - CONF
AU  - Ivanović, Milica
AU  - Vorkapić, Miloš
AU  - Simonović, Aleksandar
AU  - Ivanov, Toni
AU  - Stamenković, Igor
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5420
AB  - The use of threaded inserts embedded in plastic parts is very common in variety of industries including electronics, automotive, aerospace, medical, transportation, defense etc., particularly where frequent assembly and disassembly are required. Performed technique of placement the inserts in specimens is heat staking - pressing the heated insert into the mounting hole to melt the material surrounding the insert. Specimens were made of PLA and obtained using a commercial Creality Ender-6 3D printer. The square-shaped samples have dimensions of 20 x 20 x 4 [mm] with a 4.6 [mm] diameter central hole for placing brass inserts with M3 thread.
PB  - SIRAMM H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020
C3  - Workshop Programme and the Book of Abstracts - 2nd International Workshop on Structural Integrity of Additively Manufactured Materials – SIAMM22, 4th - 5th February 2022, Brno, Czech Republic
T1  - Influence of wall layer number around brass inserts in 3D printed specimens subjected to axial pull-out force
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5420
ER  - 

@conference{
author = "Ivanović, Milica and Vorkapić, Miloš and Simonović, Aleksandar and Ivanov, Toni and Stamenković, Igor",
year = "2022",
abstract = "The use of threaded inserts embedded in plastic parts is very common in variety of industries including electronics, automotive, aerospace, medical, transportation, defense etc., particularly where frequent assembly and disassembly are required. Performed technique of placement the inserts in specimens is heat staking - pressing the heated insert into the mounting hole to melt the material surrounding the insert. Specimens were made of PLA and obtained using a commercial Creality Ender-6 3D printer. The square-shaped samples have dimensions of 20 x 20 x 4 [mm] with a 4.6 [mm] diameter central hole for placing brass inserts with M3 thread.",
publisher = "SIRAMM H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020",
journal = "Workshop Programme and the Book of Abstracts - 2nd International Workshop on Structural Integrity of Additively Manufactured Materials – SIAMM22, 4th - 5th February 2022, Brno, Czech Republic",
title = "Influence of wall layer number around brass inserts in 3D printed specimens subjected to axial pull-out force",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5420"
}

Ivanović, M., Vorkapić, M., Simonović, A., Ivanov, T.,& Stamenković, I.. (2022). Influence of wall layer number around brass inserts in 3D printed specimens subjected to axial pull-out force. in Workshop Programme and the Book of Abstracts - 2nd International Workshop on Structural Integrity of Additively Manufactured Materials – SIAMM22, 4th - 5th February 2022, Brno, Czech Republic
SIRAMM H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020..
https://hdl.handle.net/21.15107/rcub_machinery_5420

Ivanović M, Vorkapić M, Simonović A, Ivanov T, Stamenković I. Influence of wall layer number around brass inserts in 3D printed specimens subjected to axial pull-out force. in Workshop Programme and the Book of Abstracts - 2nd International Workshop on Structural Integrity of Additively Manufactured Materials – SIAMM22, 4th - 5th February 2022, Brno, Czech Republic. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5420 .

Ivanović, Milica, Vorkapić, Miloš, Simonović, Aleksandar, Ivanov, Toni, Stamenković, Igor, "Influence of wall layer number around brass inserts in 3D printed specimens subjected to axial pull-out force" in Workshop Programme and the Book of Abstracts - 2nd International Workshop on Structural Integrity of Additively Manufactured Materials – SIAMM22, 4th - 5th February 2022, Brno, Czech Republic (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5420 .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Smiljanić, Milče
AU  - Vorkapić, Miloš
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4261
AB  - Microfluidic devices are excessively used for various biomedical, chemical, and engineering
applications. The most common microfluidic platforms are obtained from
polydimethylsiloxane (PDMS). Platforms based on etched silicon wafers anodically bonded to
Pyrex glass are more mechanically rigid, have better sealing and there is no gas permeability
compared to those obtained from PDMS [1,2]. The aim of our work is to numerically analyze
fluid flow in anisotropically etched silicon microchannels sealed with Pyrex glass. We present
simulations of fluid flow in Y-bifurcated microchannels fabricated from the etched {100}
silicon in 25 wt% tetramethylammonium hydroxide (TMAH) water solution at the temperature
of 80°C [3]. We have explored two symmetrical Y-bifurcations that are defined with acute
angles of 36.8° and 19° with the sides that are along the <310> and <610> crystallographic
directions in the masking layer [3], respectively. The angles between obtained sidewalls and
{100} silicon of two ingoing microchannels for the first and second Y-bifurcation are 72.5°
and 80.7°, respectively. The sidewalls of outgoing microchannel in both cases are defined with
<100> crystallographic directions and they are orthogonal to the surface of {100} silicon wafer.
The appropriate widths of ingoing and outgoing microchannels are 300 and 400 μm,
respectively. The depth of microchannels is 55 μm. All simulated flows are three-dimensional
(3D), steady and laminar [4], while the investigated fluid is water. Velocities and pressure
values are defined at the inlet and outlet boundaries, respectively. The resulting flows are
illustrated by velocity contours. The obtained conclusions from fluid flow simulations of
presented simple Y-bifurcations provide guidance for future fabrication of complex
microfluidic platforms by a cost-effective process with good control over microchannel
dimensions.
PB  - University of Belgrade, Faculty of Mechanical Engineering
C3  - Booklet of Abstracts - 1st International Conference on Mathematical Modelling in Mechanics and Engineering
T1  - Simulating flow in silicon Y-bifurcated microchannels
SP  - 46
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4261
ER  - 

@conference{
author = "Svorcan, Jelena and Smiljanić, Milče and Vorkapić, Miloš",
year = "2022",
abstract = "Microfluidic devices are excessively used for various biomedical, chemical, and engineering
applications. The most common microfluidic platforms are obtained from
polydimethylsiloxane (PDMS). Platforms based on etched silicon wafers anodically bonded to
Pyrex glass are more mechanically rigid, have better sealing and there is no gas permeability
compared to those obtained from PDMS [1,2]. The aim of our work is to numerically analyze
fluid flow in anisotropically etched silicon microchannels sealed with Pyrex glass. We present
simulations of fluid flow in Y-bifurcated microchannels fabricated from the etched {100}
silicon in 25 wt% tetramethylammonium hydroxide (TMAH) water solution at the temperature
of 80°C [3]. We have explored two symmetrical Y-bifurcations that are defined with acute
angles of 36.8° and 19° with the sides that are along the <310> and <610> crystallographic
directions in the masking layer [3], respectively. The angles between obtained sidewalls and
{100} silicon of two ingoing microchannels for the first and second Y-bifurcation are 72.5°
and 80.7°, respectively. The sidewalls of outgoing microchannel in both cases are defined with
<100> crystallographic directions and they are orthogonal to the surface of {100} silicon wafer.
The appropriate widths of ingoing and outgoing microchannels are 300 and 400 μm,
respectively. The depth of microchannels is 55 μm. All simulated flows are three-dimensional
(3D), steady and laminar [4], while the investigated fluid is water. Velocities and pressure
values are defined at the inlet and outlet boundaries, respectively. The resulting flows are
illustrated by velocity contours. The obtained conclusions from fluid flow simulations of
presented simple Y-bifurcations provide guidance for future fabrication of complex
microfluidic platforms by a cost-effective process with good control over microchannel
dimensions.",
publisher = "University of Belgrade, Faculty of Mechanical Engineering",
journal = "Booklet of Abstracts - 1st International Conference on Mathematical Modelling in Mechanics and Engineering",
title = "Simulating flow in silicon Y-bifurcated microchannels",
pages = "46",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4261"
}

Svorcan, J., Smiljanić, M.,& Vorkapić, M.. (2022). Simulating flow in silicon Y-bifurcated microchannels. in Booklet of Abstracts - 1st International Conference on Mathematical Modelling in Mechanics and Engineering
University of Belgrade, Faculty of Mechanical Engineering., 46.
https://hdl.handle.net/21.15107/rcub_machinery_4261

Svorcan J, Smiljanić M, Vorkapić M. Simulating flow in silicon Y-bifurcated microchannels. in Booklet of Abstracts - 1st International Conference on Mathematical Modelling in Mechanics and Engineering. 2022;:46.
https://hdl.handle.net/21.15107/rcub_machinery_4261 .

Svorcan, Jelena, Smiljanić, Milče, Vorkapić, Miloš, "Simulating flow in silicon Y-bifurcated microchannels" in Booklet of Abstracts - 1st International Conference on Mathematical Modelling in Mechanics and Engineering (2022):46,
https://hdl.handle.net/21.15107/rcub_machinery_4261 .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Ivanov, Toni
AU  - Kovačević, Aleksandar
AU  - Mohammad Sakib, Hasan
AU  - Simonović, Aleksandar
AU  - Trajković, Isaak
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5423
AB  - Five series of specimens with two different print orientations (−45/45 and 0/90) and two print layer thicknesses (0.1 and 0.2 mm) were made. In total 60 specimens with 100% filament infill were made. One specimen series (20 pieces) was isolated as a reference or thermally untreated. Before the thermal treatment (annealing), two specimen moulding methods were used: NaCl powder (granulation 63 mm: 20 pieces) and Calcium Sulphate (Gypsum: 20 pieces). During the annealing, specimens immersed in NaCl powder were heated in a drying oven to the filament melting point (for PLA: 200°C, with a duration interval of 30 min), while the treatment of the heated specimens in gypsum was performed at a temperature of around 190°C, with duration interval of 3 h with the observed temperature inside the mould of about 100°C. An ultrasonic bath and a drying oven were used in the gypsum treatment. Temperature measurement and control during both annealing treatments were performed using a thermal imaging camera, while the temperature control inside the drying oven was performed using a digital thermometer. After treatment, the specimens in the moulds were cooled at room temperature, and the dimensions of annealing and untreated specimens were controlled. Surface morphology was characterised using scanning electron microscopy (SEM). The SEM analysis reveals improved internal structure after heat treatment of the PLA specimens. These results show that the investigated specimens after heat treatments had better structural properties than the referent specimens. Tensile testing on a universal testing machine in compliance with the ASTM D638 standard was also performed. The referent PLA specimen with −45/45 and layer thickness of 0.1 mm had the highest tensile stress value (64.08 MPa) while the specimen with minimal tensile stress value before fracture was 0/90, 0.2 mm (54.81 MPa). Heat treatment in gypsum showed the most significant increase in strength with −45/45 (0.1 mm) being the strongest (71.66 MPa) while the strongest specimen treated in sodium chloride was −45/45 (0.1 mm) with maximum tensile stress of 70.08 MPa. The mechanical characteristics of the PLA were characterised using the Vickers microhardness tester. The PLA microhardness value was calculated according to standards ASTM E384 and ISO 6507. The referent PLA specimen with −45/45 (0.2 mm) orientation shows the maximal microhardness value (125 MPa), and the minimal microhardness value was observed for the 0/90 (0.1 mm) orientation specimens (108 MPa). The heat treatment specimens in gypsum have a better hardness (185 MPa) than those treated in gypsum (165 MPa), with microhardness increasing by about 12%. The essence of the work is reflected in the additional filament processing to achieve a better structural and mechanical performance of the materials and reduce the anisotropy that is characteristic of 3D printing.
PB  - SAGE
T2  - Advances in Mechanical Engineering
T1  - Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds
EP  - 15
IS  - 8
SP  - 1
VL  - 14
DO  - 10.1177/16878132221120737
ER  - 

@article{
author = "Vorkapić, Miloš and Mladenović, Ivana and Ivanov, Toni and Kovačević, Aleksandar and Mohammad Sakib, Hasan and Simonović, Aleksandar and Trajković, Isaak",
year = "2022",
abstract = "Five series of specimens with two different print orientations (−45/45 and 0/90) and two print layer thicknesses (0.1 and 0.2 mm) were made. In total 60 specimens with 100% filament infill were made. One specimen series (20 pieces) was isolated as a reference or thermally untreated. Before the thermal treatment (annealing), two specimen moulding methods were used: NaCl powder (granulation 63 mm: 20 pieces) and Calcium Sulphate (Gypsum: 20 pieces). During the annealing, specimens immersed in NaCl powder were heated in a drying oven to the filament melting point (for PLA: 200°C, with a duration interval of 30 min), while the treatment of the heated specimens in gypsum was performed at a temperature of around 190°C, with duration interval of 3 h with the observed temperature inside the mould of about 100°C. An ultrasonic bath and a drying oven were used in the gypsum treatment. Temperature measurement and control during both annealing treatments were performed using a thermal imaging camera, while the temperature control inside the drying oven was performed using a digital thermometer. After treatment, the specimens in the moulds were cooled at room temperature, and the dimensions of annealing and untreated specimens were controlled. Surface morphology was characterised using scanning electron microscopy (SEM). The SEM analysis reveals improved internal structure after heat treatment of the PLA specimens. These results show that the investigated specimens after heat treatments had better structural properties than the referent specimens. Tensile testing on a universal testing machine in compliance with the ASTM D638 standard was also performed. The referent PLA specimen with −45/45 and layer thickness of 0.1 mm had the highest tensile stress value (64.08 MPa) while the specimen with minimal tensile stress value before fracture was 0/90, 0.2 mm (54.81 MPa). Heat treatment in gypsum showed the most significant increase in strength with −45/45 (0.1 mm) being the strongest (71.66 MPa) while the strongest specimen treated in sodium chloride was −45/45 (0.1 mm) with maximum tensile stress of 70.08 MPa. The mechanical characteristics of the PLA were characterised using the Vickers microhardness tester. The PLA microhardness value was calculated according to standards ASTM E384 and ISO 6507. The referent PLA specimen with −45/45 (0.2 mm) orientation shows the maximal microhardness value (125 MPa), and the minimal microhardness value was observed for the 0/90 (0.1 mm) orientation specimens (108 MPa). The heat treatment specimens in gypsum have a better hardness (185 MPa) than those treated in gypsum (165 MPa), with microhardness increasing by about 12%. The essence of the work is reflected in the additional filament processing to achieve a better structural and mechanical performance of the materials and reduce the anisotropy that is characteristic of 3D printing.",
publisher = "SAGE",
journal = "Advances in Mechanical Engineering",
title = "Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds",
pages = "15-1",
number = "8",
volume = "14",
doi = "10.1177/16878132221120737"
}

Vorkapić, M., Mladenović, I., Ivanov, T., Kovačević, A., Mohammad Sakib, H., Simonović, A.,& Trajković, I.. (2022). Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds. in Advances in Mechanical Engineering
SAGE., 14(8), 1-15.
https://doi.org/10.1177/16878132221120737

Vorkapić M, Mladenović I, Ivanov T, Kovačević A, Mohammad Sakib H, Simonović A, Trajković I. Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds. in Advances in Mechanical Engineering. 2022;14(8):1-15.
doi:10.1177/16878132221120737 .

Vorkapić, Miloš, Mladenović, Ivana, Ivanov, Toni, Kovačević, Aleksandar, Mohammad Sakib, Hasan, Simonović, Aleksandar, Trajković, Isaak, "Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds" in Advances in Mechanical Engineering, 14, no. 8 (2022):1-15,
https://doi.org/10.1177/16878132221120737 . .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Pergal, Marija
AU  - Ivanov, Toni
AU  - Baltić, Marija
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5421
AB  - Three-dimensional printed plastic products developed through fused deposition modelling (FDM) take long-term mechanical loading in most industrial prototypes. This article focuses on the impact of the 3D printing parameters, type of thermal treatment and variation of characteristic dimensions of standard specimens on the tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl powder were heated to the melting temperature of the filament (200 °C), while the processing of the plastered specimens was performed at a temperature of 100 °C. After treatment, the specimens were cooled at room temperature (25 °C), and the dimensions of the annealed and untreated specimens were controlled. The tensile test of the specimens was performed on the universal test machine. The response surface methodology (RSM) is employed to predict the tensile stress by undertaking input parameters. The analysis of variance (ANOVA) results revealed that the untreated specimens, orientation –45/45 and layer thickness of 0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed a significant increase in tensile strength, while the best specimens were obtained after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.
PB  - Belgrade : Balkan Scientific Centre
T2  - Tribology and Materials
T1  - Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology
EP  - 80
IS  - 2
SP  - 70
VL  - 1
DO  - 10.46793/tribomat.2022.009
ER  - 

@article{
author = "Vorkapić, Miloš and Mladenović, Ivana and Pergal, Marija and Ivanov, Toni and Baltić, Marija",
year = "2022",
abstract = "Three-dimensional printed plastic products developed through fused deposition modelling (FDM) take long-term mechanical loading in most industrial prototypes. This article focuses on the impact of the 3D printing parameters, type of thermal treatment and variation of characteristic dimensions of standard specimens on the tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl powder were heated to the melting temperature of the filament (200 °C), while the processing of the plastered specimens was performed at a temperature of 100 °C. After treatment, the specimens were cooled at room temperature (25 °C), and the dimensions of the annealed and untreated specimens were controlled. The tensile test of the specimens was performed on the universal test machine. The response surface methodology (RSM) is employed to predict the tensile stress by undertaking input parameters. The analysis of variance (ANOVA) results revealed that the untreated specimens, orientation –45/45 and layer thickness of 0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed a significant increase in tensile strength, while the best specimens were obtained after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.",
publisher = "Belgrade : Balkan Scientific Centre",
journal = "Tribology and Materials",
title = "Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology",
pages = "80-70",
number = "2",
volume = "1",
doi = "10.46793/tribomat.2022.009"
}

Vorkapić, M., Mladenović, I., Pergal, M., Ivanov, T.,& Baltić, M.. (2022). Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology. in Tribology and Materials
Belgrade : Balkan Scientific Centre., 1(2), 70-80.
https://doi.org/10.46793/tribomat.2022.009

Vorkapić M, Mladenović I, Pergal M, Ivanov T, Baltić M. Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology. in Tribology and Materials. 2022;1(2):70-80.
doi:10.46793/tribomat.2022.009 .

Vorkapić, Miloš, Mladenović, Ivana, Pergal, Marija, Ivanov, Toni, Baltić, Marija, "Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology" in Tribology and Materials, 1, no. 2 (2022):70-80,
https://doi.org/10.46793/tribomat.2022.009 . .

TY  - CHAP
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5418
AB  - This paper investigates the implementation of additive manufacturing (AM) in circular production (CP) through the 6R strategy. The methodology allows designers to reconsider their decisions, correct mistakes or make specific changes to the model in all phases of the design process, from initial drawings to the finished product. CP enables the complete realisation of the model/prototype with a particular focus on environmental protection and the additional use of recycled waste. The proposed algorithm is tested through the design and manufacturing of an enclosure of an industrial temperature transmitter. Some of the weaknesses of additive manufacturing, such as mechanically damaged surfaces, surface roughness, and tearing of models on weak joints, have been investigated, and recommendations for mitigation are given.

The mechanical product finishing methods are described in detail in the paper as well, and in order to check the prototype functionality, some tensile, thermal stress and drop tests were performed, and the results were analysed and discussed. It was shown that significant savings in time, cost and material can be achieved by implementing AM in realising a fully functional prototype while simultaneously in line with the demands for CP and 6R.
PB  - Springer
T2  - Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems
T1  - Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter
VL  - 564
DO  - 10.1007/978-3-031-19499-3_3
ER  - 

@inbook{
author = "Vorkapić, Miloš and Ivanov, Toni",
year = "2022",
abstract = "This paper investigates the implementation of additive manufacturing (AM) in circular production (CP) through the 6R strategy. The methodology allows designers to reconsider their decisions, correct mistakes or make specific changes to the model in all phases of the design process, from initial drawings to the finished product. CP enables the complete realisation of the model/prototype with a particular focus on environmental protection and the additional use of recycled waste. The proposed algorithm is tested through the design and manufacturing of an enclosure of an industrial temperature transmitter. Some of the weaknesses of additive manufacturing, such as mechanically damaged surfaces, surface roughness, and tearing of models on weak joints, have been investigated, and recommendations for mitigation are given.

The mechanical product finishing methods are described in detail in the paper as well, and in order to check the prototype functionality, some tensile, thermal stress and drop tests were performed, and the results were analysed and discussed. It was shown that significant savings in time, cost and material can be achieved by implementing AM in realising a fully functional prototype while simultaneously in line with the demands for CP and 6R.",
publisher = "Springer",
journal = "Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems",
booktitle = "Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter",
volume = "564",
doi = "10.1007/978-3-031-19499-3_3"
}

Vorkapić, M.,& Ivanov, T.. (2022). Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter. in Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems
Springer., 564.
https://doi.org/10.1007/978-3-031-19499-3_3

Vorkapić M, Ivanov T. Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter. in Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems. 2022;564.
doi:10.1007/978-3-031-19499-3_3 .

Vorkapić, Miloš, Ivanov, Toni, "Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter" in Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems, 564 (2022),
https://doi.org/10.1007/978-3-031-19499-3_3 . .

TY  - CONF
AU  - Vorkapić, Miloš
AU  - Stajčić, Aleksandar
AU  - Mladenović, Ivana
AU  - Ivanov, Toni
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5427
AB  - Iako 3D štampa verovatno neće preuzeti mnoge konvencionalne metode proizvodnje, 3D štampač može brzo da isporuči složeni dizajn sa velikom tačnošću. Međutim, aditivna proizvodnja takođe pokazuje određene slabosti. Ako karakteristike materijala nisu definisane, mogu se pojaviti problemi u realizaciji 3D modela. U našem radu je razmotreno osam uzoraka sa različitim vrednostima parametara: visina sloja, orijentacija ispune i gustina ispune. U softveru Ultimaker Cura postavlјeni su svi parametri uzorka, dok vizualizaciju dizajna uzorka vrši putanja mlaznica. Mikroskopski pregled strukture ispune pokazao je da postoje određene nepravilnosti u cilјu ispitivanja realizacije i orijentacije slojeva. U našoj analizi upotrebljena je polinalektična kiselina (PLA). Spolјni uticaji su takođe važni poput: mehaničko oštećenje, temperatura na vrhu mlaznice i brzine hlađenja materijala u okruženju. Sve to utiče na kvalitet. Mikroskopskom analizom pokušali su da se utvrde korelacije, problemi unutar strukture materijala, ali i da se daju preporuke za pobolјšanje realizacije modela.
PB  - Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet / Belgrade : UASQ - United Association of Serbia for Quality
C3  - Zbornik radova JUSK ICQ - XVII Međunarodna konvencija o kvalitetu 2021, 09-11/06/2021, Beograd, Srbija
T1  - Primer realizacije uzorka pomoću 3D štampe i analiza problema u kvalitetu
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5427
ER  - 

@conference{
author = "Vorkapić, Miloš and Stajčić, Aleksandar and Mladenović, Ivana and Ivanov, Toni",
year = "2021",
abstract = "Iako 3D štampa verovatno neće preuzeti mnoge konvencionalne metode proizvodnje, 3D štampač može brzo da isporuči složeni dizajn sa velikom tačnošću. Međutim, aditivna proizvodnja takođe pokazuje određene slabosti. Ako karakteristike materijala nisu definisane, mogu se pojaviti problemi u realizaciji 3D modela. U našem radu je razmotreno osam uzoraka sa različitim vrednostima parametara: visina sloja, orijentacija ispune i gustina ispune. U softveru Ultimaker Cura postavlјeni su svi parametri uzorka, dok vizualizaciju dizajna uzorka vrši putanja mlaznica. Mikroskopski pregled strukture ispune pokazao je da postoje određene nepravilnosti u cilјu ispitivanja realizacije i orijentacije slojeva. U našoj analizi upotrebljena je polinalektična kiselina (PLA). Spolјni uticaji su takođe važni poput: mehaničko oštećenje, temperatura na vrhu mlaznice i brzine hlađenja materijala u okruženju. Sve to utiče na kvalitet. Mikroskopskom analizom pokušali su da se utvrde korelacije, problemi unutar strukture materijala, ali i da se daju preporuke za pobolјšanje realizacije modela.",
publisher = "Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet / Belgrade : UASQ - United Association of Serbia for Quality",
journal = "Zbornik radova JUSK ICQ - XVII Međunarodna konvencija o kvalitetu 2021, 09-11/06/2021, Beograd, Srbija",
title = "Primer realizacije uzorka pomoću 3D štampe i analiza problema u kvalitetu",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5427"
}

Vorkapić, M., Stajčić, A., Mladenović, I.,& Ivanov, T.. (2021). Primer realizacije uzorka pomoću 3D štampe i analiza problema u kvalitetu. in Zbornik radova JUSK ICQ - XVII Međunarodna konvencija o kvalitetu 2021, 09-11/06/2021, Beograd, Srbija
Beograd : JUSK - Jedinstveno Udruženje Srbije za Kvalitet / Belgrade : UASQ - United Association of Serbia for Quality..
https://hdl.handle.net/21.15107/rcub_machinery_5427

Vorkapić M, Stajčić A, Mladenović I, Ivanov T. Primer realizacije uzorka pomoću 3D štampe i analiza problema u kvalitetu. in Zbornik radova JUSK ICQ - XVII Međunarodna konvencija o kvalitetu 2021, 09-11/06/2021, Beograd, Srbija. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_5427 .

Vorkapić, Miloš, Stajčić, Aleksandar, Mladenović, Ivana, Ivanov, Toni, "Primer realizacije uzorka pomoću 3D štampe i analiza problema u kvalitetu" in Zbornik radova JUSK ICQ - XVII Međunarodna konvencija o kvalitetu 2021, 09-11/06/2021, Beograd, Srbija (2021),
https://hdl.handle.net/21.15107/rcub_machinery_5427 .

TY  - CONF
AU  - Hasan, Sakib Mohammad
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5426
AB  - In this paper, bone-shaped samples (dogbone) made of thermoplastic polymer PLA were tested according to the ASTM D638 standard. All samples were made on a WANHAO duplicator i3 plus 3D printer. PLA is the most widely used polymer mainly due to its thermoplastic workability and good mechanical properties. The mechanical characteristics of the materials were compared after the realization of the samples on the 3D printer and after the remelting process. All samples were built in horizontal orientation. Remelting process involves stacking / packing samples in a mold and pressing them with sodium chloride (NaCl) powder. Since sodium chloride (NaCl) is a poor conductor of temperature, it takes some time for the experiment to be realized in order to equalize the temperatures throughout the volume of the mold. The mold thus formed was kept at 210°C for 30-45 minutes. The purpose of salt powder molding is to get even curing without deformation on the surfaces of the parts. The samples become rougher after this treatment and it is necessary to remove excess salt from the structure as well as additional surface treatment. The remelting process proved to be very cheap, but also quite unreliable due to the slow and uneven rise in temperature in the mold. The SHIMADZU AGS-X 100 kN tensile testing machine was used to test the tensile strength of the samples. During the experiment, it was found that the samples with remelting process have a much higher tensile strength compared to the untreated samples. Remelting procedure of PLA greatly improves the mechanical properties and gives better performance to complex parts printed on a 3D printer by reducing the anisotropic characteristics of the polymer. Further research would be related to the testing of other thermoplastic materials such as ABS, PET-G etc. It would be interesting to use other materials for molding and to perform a comparative analysis of the obtained results of the new molding methods with the described method of applying salt powder.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia
T1  - Improvement of mechanical characteristics of PLA by applying remelting process
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5426
ER  - 

@conference{
author = "Hasan, Sakib Mohammad and Ivanov, Toni and Vorkapić, Miloš",
year = "2021",
abstract = "In this paper, bone-shaped samples (dogbone) made of thermoplastic polymer PLA were tested according to the ASTM D638 standard. All samples were made on a WANHAO duplicator i3 plus 3D printer. PLA is the most widely used polymer mainly due to its thermoplastic workability and good mechanical properties. The mechanical characteristics of the materials were compared after the realization of the samples on the 3D printer and after the remelting process. All samples were built in horizontal orientation. Remelting process involves stacking / packing samples in a mold and pressing them with sodium chloride (NaCl) powder. Since sodium chloride (NaCl) is a poor conductor of temperature, it takes some time for the experiment to be realized in order to equalize the temperatures throughout the volume of the mold. The mold thus formed was kept at 210°C for 30-45 minutes. The purpose of salt powder molding is to get even curing without deformation on the surfaces of the parts. The samples become rougher after this treatment and it is necessary to remove excess salt from the structure as well as additional surface treatment. The remelting process proved to be very cheap, but also quite unreliable due to the slow and uneven rise in temperature in the mold. The SHIMADZU AGS-X 100 kN tensile testing machine was used to test the tensile strength of the samples. During the experiment, it was found that the samples with remelting process have a much higher tensile strength compared to the untreated samples. Remelting procedure of PLA greatly improves the mechanical properties and gives better performance to complex parts printed on a 3D printer by reducing the anisotropic characteristics of the polymer. Further research would be related to the testing of other thermoplastic materials such as ABS, PET-G etc. It would be interesting to use other materials for molding and to perform a comparative analysis of the obtained results of the new molding methods with the described method of applying salt powder.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia",
title = "Improvement of mechanical characteristics of PLA by applying remelting process",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5426"
}

Hasan, S. M., Ivanov, T.,& Vorkapić, M.. (2021). Improvement of mechanical characteristics of PLA by applying remelting process. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering..
https://hdl.handle.net/21.15107/rcub_machinery_5426

Hasan SM, Ivanov T, Vorkapić M. Improvement of mechanical characteristics of PLA by applying remelting process. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_5426 .

Hasan, Sakib Mohammad, Ivanov, Toni, Vorkapić, Miloš, "Improvement of mechanical characteristics of PLA by applying remelting process" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia (2021),
https://hdl.handle.net/21.15107/rcub_machinery_5426 .

TY  - CONF
AU  - Ilić, Stefan
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Svorcan, Jelena
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5425
AB  - The application of additive technology gives a designer more freedom in designing and defining the optimal product design. Also, it is possible to make a model with different materials that have different mechanical properties in order to meet different requirements in different places inside and outside of the part. In this paper, a 3D printer Wanhao Duplicator, type i3 plus, made in the People's Republic of China, was used for the realization of the elements of a mechanical mounting system. It is a desktop 3D printer with a maximum printable area of 200 x 200 x 180 mm3, nozzle diameter of 0.1-0.4 mm, and printing speed of 10-100 mm/s (see Figure 3). For the realization of the model, the chosen material was ABS (Acrylonitrile Butadiene Styrene) in the form of a filament (diameter 1.75 mm, manufacturer Wanhao). ABS is an amorphous polymer with the following features: excellent mechanical properties, resistance to elevated temperatures, and resistance to shocks. On the Wanhao printer, the prescribed distance between the nozzle and the plate is 0.1 mm. This is the minimum thickness of a single printed layer in the xy plane. The diameter of the melted thread is 0.1 mm, which is very thin, allowing for a very dense construction of the print along the z axis. All these parameters are essential for the quality of the print. 3D printing technology enabled the custom design and fabrication of a mechanical system intended to be placed in an irradiation room, in order to hold the component whose electric characteristics are being examined. The irradiation room may contain one or more sources of ionizing radiation. Each irradiation room may have a different way of mounting the component under test. Since it is necessary to study a specific electronic component with different ionizing radiation sources (gamma and X-ray), at different dose rates, and located in different irradiation rooms, designing a custom mounting system for each irradiation room is necessary. The cost of making a mechanical mounting system using 3D printing technology is significantly lower compared to other production methods. Thus, the creation of a system for each irradiation room individually becomes more economical. Creating such a system for each irradiation room allows much easier and more accurate positioning of the component, which reduces the error in calculating the dose that the component receives during irradiation. Each mechanical system should allow the installation of printed circuit boards of different sizes, on which the tested electronic components are located. Also, the material from which the mounting system is made must not affect the component during the experiment. Materials used in 3D printing have a negligible effect on the reflection or scattering of high-energy photons because they do not contain atoms with heavy nuclei.
PB  - SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020
C3  - Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia
T1  - The use of 3D printing for studying the influence of ionizing radiation on electronic components
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5425
ER  - 

@conference{
author = "Ilić, Stefan and Vorkapić, Miloš and Ivanov, Toni and Svorcan, Jelena",
year = "2021",
abstract = "The application of additive technology gives a designer more freedom in designing and defining the optimal product design. Also, it is possible to make a model with different materials that have different mechanical properties in order to meet different requirements in different places inside and outside of the part. In this paper, a 3D printer Wanhao Duplicator, type i3 plus, made in the People's Republic of China, was used for the realization of the elements of a mechanical mounting system. It is a desktop 3D printer with a maximum printable area of 200 x 200 x 180 mm3, nozzle diameter of 0.1-0.4 mm, and printing speed of 10-100 mm/s (see Figure 3). For the realization of the model, the chosen material was ABS (Acrylonitrile Butadiene Styrene) in the form of a filament (diameter 1.75 mm, manufacturer Wanhao). ABS is an amorphous polymer with the following features: excellent mechanical properties, resistance to elevated temperatures, and resistance to shocks. On the Wanhao printer, the prescribed distance between the nozzle and the plate is 0.1 mm. This is the minimum thickness of a single printed layer in the xy plane. The diameter of the melted thread is 0.1 mm, which is very thin, allowing for a very dense construction of the print along the z axis. All these parameters are essential for the quality of the print. 3D printing technology enabled the custom design and fabrication of a mechanical system intended to be placed in an irradiation room, in order to hold the component whose electric characteristics are being examined. The irradiation room may contain one or more sources of ionizing radiation. Each irradiation room may have a different way of mounting the component under test. Since it is necessary to study a specific electronic component with different ionizing radiation sources (gamma and X-ray), at different dose rates, and located in different irradiation rooms, designing a custom mounting system for each irradiation room is necessary. The cost of making a mechanical mounting system using 3D printing technology is significantly lower compared to other production methods. Thus, the creation of a system for each irradiation room individually becomes more economical. Creating such a system for each irradiation room allows much easier and more accurate positioning of the component, which reduces the error in calculating the dose that the component receives during irradiation. Each mechanical system should allow the installation of printed circuit boards of different sizes, on which the tested electronic components are located. Also, the material from which the mounting system is made must not affect the component during the experiment. Materials used in 3D printing have a negligible effect on the reflection or scattering of high-energy photons because they do not contain atoms with heavy nuclei.",
publisher = "SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020",
journal = "Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia",
title = "The use of 3D printing for studying the influence of ionizing radiation on electronic components",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5425"
}

Ilić, S., Vorkapić, M., Ivanov, T.,& Svorcan, J.. (2021). The use of 3D printing for studying the influence of ionizing radiation on electronic components. in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia
SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020..
https://hdl.handle.net/21.15107/rcub_machinery_5425

Ilić S, Vorkapić M, Ivanov T, Svorcan J. The use of 3D printing for studying the influence of ionizing radiation on electronic components. in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_5425 .

Ilić, Stefan, Vorkapić, Miloš, Ivanov, Toni, Svorcan, Jelena, "The use of 3D printing for studying the influence of ionizing radiation on electronic components" in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia (2021),
https://hdl.handle.net/21.15107/rcub_machinery_5425 .

TY  - GEN
AU  - Mladenović, Ivana
AU  - Lamovec, Jelena
AU  - Vorkapić, Miloš
AU  - Frantlović, Miloš
AU  - Poljak, Predrag
AU  - Obradov, Marko
AU  - Vencl, Aleksandar
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4359
T1  - Laboratorijski prototip automatizovanog uređaja za ispitivanje adhezije testom na savijanje tankih metalnih filmova na fleksibilnim folijama
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4359
ER  - 

@misc{
author = "Mladenović, Ivana and Lamovec, Jelena and Vorkapić, Miloš and Frantlović, Miloš and Poljak, Predrag and Obradov, Marko and Vencl, Aleksandar",
year = "2021",
title = "Laboratorijski prototip automatizovanog uređaja za ispitivanje adhezije testom na savijanje tankih metalnih filmova na fleksibilnim folijama",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4359"
}

Mladenović, I., Lamovec, J., Vorkapić, M., Frantlović, M., Poljak, P., Obradov, M.,& Vencl, A.. (2021). Laboratorijski prototip automatizovanog uređaja za ispitivanje adhezije testom na savijanje tankih metalnih filmova na fleksibilnim folijama. .
https://hdl.handle.net/21.15107/rcub_machinery_4359

Mladenović I, Lamovec J, Vorkapić M, Frantlović M, Poljak P, Obradov M, Vencl A. Laboratorijski prototip automatizovanog uređaja za ispitivanje adhezije testom na savijanje tankih metalnih filmova na fleksibilnim folijama. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_4359 .

Mladenović, Ivana, Lamovec, Jelena, Vorkapić, Miloš, Frantlović, Miloš, Poljak, Predrag, Obradov, Marko, Vencl, Aleksandar, "Laboratorijski prototip automatizovanog uređaja za ispitivanje adhezije testom na savijanje tankih metalnih filmova na fleksibilnim folijama" (2021),
https://hdl.handle.net/21.15107/rcub_machinery_4359 .

TY  - JOUR
AU  - Perić, Bojan M.
AU  - Simonović, Aleksandar
AU  - Vorkapić, Miloš
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3486
AB  - The purpose of this paper is to explore and define an adequate numerical setting for the computation of aerodynamic performances of wind turbines of various shapes and sizes, which offers the possibility of choosing a suitable approach of minimal complexity for the future research. Here, mechanical power, thrust, power coefficient, thrust coefficient, pressure coefficient, pressure distribution along the blade, relative velocity contoure, at different wind speeds and streamlines were considered by two different methods: the blade element momentum and CFD, within which three different turbulence models were analyzed. The estimation of the mentioned aerodynamic performances was carried out on two different wind turbine blades. The obtained solutions were compared with the experimental and nominal (up-scaled) values, available in the literature. Although the flow was considered as steady, a satisfactory correlation between numerical and experimental results was achieved. The comparison between results also showed, the significance of selection, regarding the complexity and geometry of the analyzed wind turbine blade, the most appropriate numerical approach for computation of aerodynamic performances.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Comparative analysis of numerical computational techniques for determination of the wind turbine aerodynamic performances
EP  - 2515
IS  - 4
SP  - 2503
VL  - 25
DO  - 10.2298/TSCI200216175P
ER  - 

@article{
author = "Perić, Bojan M. and Simonović, Aleksandar and Vorkapić, Miloš",
year = "2021",
abstract = "The purpose of this paper is to explore and define an adequate numerical setting for the computation of aerodynamic performances of wind turbines of various shapes and sizes, which offers the possibility of choosing a suitable approach of minimal complexity for the future research. Here, mechanical power, thrust, power coefficient, thrust coefficient, pressure coefficient, pressure distribution along the blade, relative velocity contoure, at different wind speeds and streamlines were considered by two different methods: the blade element momentum and CFD, within which three different turbulence models were analyzed. The estimation of the mentioned aerodynamic performances was carried out on two different wind turbine blades. The obtained solutions were compared with the experimental and nominal (up-scaled) values, available in the literature. Although the flow was considered as steady, a satisfactory correlation between numerical and experimental results was achieved. The comparison between results also showed, the significance of selection, regarding the complexity and geometry of the analyzed wind turbine blade, the most appropriate numerical approach for computation of aerodynamic performances.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Comparative analysis of numerical computational techniques for determination of the wind turbine aerodynamic performances",
pages = "2515-2503",
number = "4",
volume = "25",
doi = "10.2298/TSCI200216175P"
}

Perić, B. M., Simonović, A.,& Vorkapić, M.. (2021). Comparative analysis of numerical computational techniques for determination of the wind turbine aerodynamic performances. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 25(4), 2503-2515.
https://doi.org/10.2298/TSCI200216175P

Perić BM, Simonović A, Vorkapić M. Comparative analysis of numerical computational techniques for determination of the wind turbine aerodynamic performances. in Thermal Science. 2021;25(4):2503-2515.
doi:10.2298/TSCI200216175P .

Perić, Bojan M., Simonović, Aleksandar, Vorkapić, Miloš, "Comparative analysis of numerical computational techniques for determination of the wind turbine aerodynamic performances" in Thermal Science, 25, no. 4 (2021):2503-2515,
https://doi.org/10.2298/TSCI200216175P . .

TY  - JOUR
AU  - Raković, Dragan
AU  - Simonović, Aleksandar
AU  - Grbović, Aleksandar
AU  - Radović, Ljubica
AU  - Vorkapić, Miloš
AU  - Krstić, Branimir
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3490
AB  - This paper presents the failure analysis results of the helicopter skid landing gear. The helicopter skid landing gear fractured while the helicopter was on the ground at the airport. The aft cross tube of the landing gear assembly was found fractured into two pieces. Observation of crack propagation area at low magnification revealed numerous secondary cracks, inner surface irregularities while fracture surface indicated fatigue process. Macro-fractographic analysis of the fracture surface disclosed features that gave additional indication of fatigue. Examination of mating fracture surfaces under scanning electron microscope (SEM) detected the existence of irregularities in the material. Chemical analysis showed the aft cross tube is made of high-strength aluminum alloy. The stress analysis of skid landing gear, using the finite element method (FEM), has identified the stress-deformation condition of the helicopter landing gear with a detail insight of the stress state in the vicinity of the crack origin. The stress value, in case of maximal takeoff weight, was very high in the crack initiation zone. The results indicate the superposition of manufacturing-in, designing-in as well as operating in defects which led to total failure of the helicopter skid landing gear aft cross tube.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Fatigue fracture analysis of helicopter landing gear cross tube
VL  - 129
DO  - 10.1016/j.engfailanal.2021.105672
ER  - 

@article{
author = "Raković, Dragan and Simonović, Aleksandar and Grbović, Aleksandar and Radović, Ljubica and Vorkapić, Miloš and Krstić, Branimir",
year = "2021",
abstract = "This paper presents the failure analysis results of the helicopter skid landing gear. The helicopter skid landing gear fractured while the helicopter was on the ground at the airport. The aft cross tube of the landing gear assembly was found fractured into two pieces. Observation of crack propagation area at low magnification revealed numerous secondary cracks, inner surface irregularities while fracture surface indicated fatigue process. Macro-fractographic analysis of the fracture surface disclosed features that gave additional indication of fatigue. Examination of mating fracture surfaces under scanning electron microscope (SEM) detected the existence of irregularities in the material. Chemical analysis showed the aft cross tube is made of high-strength aluminum alloy. The stress analysis of skid landing gear, using the finite element method (FEM), has identified the stress-deformation condition of the helicopter landing gear with a detail insight of the stress state in the vicinity of the crack origin. The stress value, in case of maximal takeoff weight, was very high in the crack initiation zone. The results indicate the superposition of manufacturing-in, designing-in as well as operating in defects which led to total failure of the helicopter skid landing gear aft cross tube.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Fatigue fracture analysis of helicopter landing gear cross tube",
volume = "129",
doi = "10.1016/j.engfailanal.2021.105672"
}

Raković, D., Simonović, A., Grbović, A., Radović, L., Vorkapić, M.,& Krstić, B.. (2021). Fatigue fracture analysis of helicopter landing gear cross tube. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 129.
https://doi.org/10.1016/j.engfailanal.2021.105672

Raković D, Simonović A, Grbović A, Radović L, Vorkapić M, Krstić B. Fatigue fracture analysis of helicopter landing gear cross tube. in Engineering Failure Analysis. 2021;129.
doi:10.1016/j.engfailanal.2021.105672 .

Raković, Dragan, Simonović, Aleksandar, Grbović, Aleksandar, Radović, Ljubica, Vorkapić, Miloš, Krstić, Branimir, "Fatigue fracture analysis of helicopter landing gear cross tube" in Engineering Failure Analysis, 129 (2021),
https://doi.org/10.1016/j.engfailanal.2021.105672 . .

TY  - CHAP
AU  - Vorkapić, Miloš
AU  - Simonović, Aleksandar
AU  - Ivanov, Toni
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3674
AB  - Additive manufacturing technology helped many organizations to save money in the product design process by reducing prototype costs, and also by providing a means for early evaluation and decision making. The idea of this paper is to design an electronics enclosure for an intelligent industrial pressure transmitter, using the additive technology. All enclosure elements are made on a 3D printer WANHAO duplicator i3 plus, using PLA materials. The enclosure realization, from CAD drawings to the finished model, enables a designer to correct existing errors, or make certain modifications as required by end-users. A process is described that enables designers to review their decisions at any stage of product realization, thus providing much more freedom in rapid prototyping. In this example, the advantages and disadvantages of additive manufacturing over conventional manufacturing are outlined. Some deficiencies have also been observed, such as mechanical damage to surfaces, burning of surfaces, tearing of prints, and surface roughness. To mitigate such irregularities, both mechanical and chemical finishing methods were used. The example confirmed that the finishing methods can affect the final enclosure dimensions and shape. Further prototype development should focus more on print quality, which depends on the shape of surfaces, the accuracy of the geometry, the uniformity of structure and shape, material density, and the resolution of details.
PB  - Springer
T2  - Lecture Notes in Networks and Systems
T1  - Algorithm for applying 3d printing in prototype realization – case: Enclosure for an industrial pressure transmitter
EP  - 129
SP  - 112
VL  - 153
DO  - 10.1007/978-3-030-58362-0_8
ER  - 

@inbook{
author = "Vorkapić, Miloš and Simonović, Aleksandar and Ivanov, Toni",
year = "2021",
abstract = "Additive manufacturing technology helped many organizations to save money in the product design process by reducing prototype costs, and also by providing a means for early evaluation and decision making. The idea of this paper is to design an electronics enclosure for an intelligent industrial pressure transmitter, using the additive technology. All enclosure elements are made on a 3D printer WANHAO duplicator i3 plus, using PLA materials. The enclosure realization, from CAD drawings to the finished model, enables a designer to correct existing errors, or make certain modifications as required by end-users. A process is described that enables designers to review their decisions at any stage of product realization, thus providing much more freedom in rapid prototyping. In this example, the advantages and disadvantages of additive manufacturing over conventional manufacturing are outlined. Some deficiencies have also been observed, such as mechanical damage to surfaces, burning of surfaces, tearing of prints, and surface roughness. To mitigate such irregularities, both mechanical and chemical finishing methods were used. The example confirmed that the finishing methods can affect the final enclosure dimensions and shape. Further prototype development should focus more on print quality, which depends on the shape of surfaces, the accuracy of the geometry, the uniformity of structure and shape, material density, and the resolution of details.",
publisher = "Springer",
journal = "Lecture Notes in Networks and Systems",
booktitle = "Algorithm for applying 3d printing in prototype realization – case: Enclosure for an industrial pressure transmitter",
pages = "129-112",
volume = "153",
doi = "10.1007/978-3-030-58362-0_8"
}

Vorkapić, M., Simonović, A.,& Ivanov, T.. (2021). Algorithm for applying 3d printing in prototype realization – case: Enclosure for an industrial pressure transmitter. in Lecture Notes in Networks and Systems
Springer., 153, 112-129.
https://doi.org/10.1007/978-3-030-58362-0_8

Vorkapić M, Simonović A, Ivanov T. Algorithm for applying 3d printing in prototype realization – case: Enclosure for an industrial pressure transmitter. in Lecture Notes in Networks and Systems. 2021;153:112-129.
doi:10.1007/978-3-030-58362-0_8 .

Vorkapić, Miloš, Simonović, Aleksandar, Ivanov, Toni, "Algorithm for applying 3d printing in prototype realization – case: Enclosure for an industrial pressure transmitter" in Lecture Notes in Networks and Systems, 153 (2021):112-129,
https://doi.org/10.1007/978-3-030-58362-0_8 . .

TY  - CONF
AU  - Simonović, Aleksandar
AU  - Kovačević, Aleksandar
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5432
AB  - The trend of wind turbine development has a special significance in the exploitation of renewable energy sources. At higher altitudes, we have better wind energy utilization higher speed and their conversion are achieved in the best possible use of wind turbines. The development of new technologies opens space for a new generation of wind turbines with a 20MW rated power. In recent years, various feasibility studies have shown that wind turbines with large rotor diameter and high towers give positive shifts in the analysis of structural and aerodynamic parameters, with a focus on reducing overall mass and damping vibrations due to the use of new materials. In this paper, the evolution of high power wind turbines and an overview of the technological development of the basic components of the turbine will be presented. Perspectives in the further development of wind turbines with rated power above 20MW will be also considered.
PB  - Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd
C3  - 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia
T1  - Wind turbine beyond 20 MW – Technology perspective
EP  - 134
SP  - 123
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5432
ER  - 

@conference{
author = "Simonović, Aleksandar and Kovačević, Aleksandar and Ivanov, Toni and Vorkapić, Miloš",
year = "2020",
abstract = "The trend of wind turbine development has a special significance in the exploitation of renewable energy sources. At higher altitudes, we have better wind energy utilization higher speed and their conversion are achieved in the best possible use of wind turbines. The development of new technologies opens space for a new generation of wind turbines with a 20MW rated power. In recent years, various feasibility studies have shown that wind turbines with large rotor diameter and high towers give positive shifts in the analysis of structural and aerodynamic parameters, with a focus on reducing overall mass and damping vibrations due to the use of new materials. In this paper, the evolution of high power wind turbines and an overview of the technological development of the basic components of the turbine will be presented. Perspectives in the further development of wind turbines with rated power above 20MW will be also considered.",
publisher = "Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd",
journal = "8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia",
title = "Wind turbine beyond 20 MW – Technology perspective",
pages = "134-123",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5432"
}

Simonović, A., Kovačević, A., Ivanov, T.,& Vorkapić, M.. (2020). Wind turbine beyond 20 MW – Technology perspective. in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia
Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd., 123-134.
https://hdl.handle.net/21.15107/rcub_machinery_5432

Simonović A, Kovačević A, Ivanov T, Vorkapić M. Wind turbine beyond 20 MW – Technology perspective. in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia. 2020;:123-134.
https://hdl.handle.net/21.15107/rcub_machinery_5432 .

Simonović, Aleksandar, Kovačević, Aleksandar, Ivanov, Toni, Vorkapić, Miloš, "Wind turbine beyond 20 MW – Technology perspective" in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia (2020):123-134,
https://hdl.handle.net/21.15107/rcub_machinery_5432 .

TY  - CONF
AU  - Hasan, Sakib Mohammad
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Kovačević, Aleksandar
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5429
AB  - U ovom radu, izvršena je analiza i predikcija brzina štampe u eksploatacionim uslovima. Postoje odstupanja zadane brzine na štampaču od proračunate stvarne vrednosti. S tim u vezi, postoji i razlika u vremenima izrade. Ovde je posmatrana brzina kao ravnomerno pravolinijsko kretanja brizgaljke. Zato, VNM je poslužila za predikciju Vsr, sa promenom ulaznih parametara. Za rezultate predikcije brzine dobili smo zadovoljavajuću vrednost regresionog koeficijenta 0.9999 sa ukupnom MAPE greškom koja iznosi 1,84%. Mreža bi se mogla koristiti za obradu, predviđanje i optimizaciju prosečne brzine mlaznice i ostalih procesnih parametara.
PB  - Uniiverzitet u Beogradu - Mašinski fakultet
C3  - Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
T1  - Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5429
ER  - 

@conference{
author = "Hasan, Sakib Mohammad and Vorkapić, Miloš and Ivanov, Toni and Kovačević, Aleksandar",
year = "2020",
abstract = "U ovom radu, izvršena je analiza i predikcija brzina štampe u eksploatacionim uslovima. Postoje odstupanja zadane brzine na štampaču od proračunate stvarne vrednosti. S tim u vezi, postoji i razlika u vremenima izrade. Ovde je posmatrana brzina kao ravnomerno pravolinijsko kretanja brizgaljke. Zato, VNM je poslužila za predikciju Vsr, sa promenom ulaznih parametara. Za rezultate predikcije brzine dobili smo zadovoljavajuću vrednost regresionog koeficijenta 0.9999 sa ukupnom MAPE greškom koja iznosi 1,84%. Mreža bi se mogla koristiti za obradu, predviđanje i optimizaciju prosečne brzine mlaznice i ostalih procesnih parametara.",
publisher = "Uniiverzitet u Beogradu - Mašinski fakultet",
journal = "Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference",
title = "Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5429"
}

Hasan, S. M., Vorkapić, M., Ivanov, T.,& Kovačević, A.. (2020). Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference
Uniiverzitet u Beogradu - Mašinski fakultet..
https://hdl.handle.net/21.15107/rcub_machinery_5429

Hasan SM, Vorkapić M, Ivanov T, Kovačević A. Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža. in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference. 2020;.
https://hdl.handle.net/21.15107/rcub_machinery_5429 .

Hasan, Sakib Mohammad, Vorkapić, Miloš, Ivanov, Toni, Kovačević, Aleksandar, "Predikcija brzine na 3D štampaču primenom veštačkih neuronskih mreža" in Zbornik radova - 42. JUPITER konferencija / Proceedings - 42nd JUPITER Conference (2020),
https://hdl.handle.net/21.15107/rcub_machinery_5429 .

TY  - CONF
AU  - Hasan, Sakib Mohammad
AU  - Ivanov, Toni
AU  - Tanović, Dragoljub
AU  - Simonović, Aleksandar
AU  - Vorkapić, Miloš
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5431
AB  - Additive manufacturing (AM) or 3D printing is becoming very popular in the aerospace and defense industry because of its ability to manufacture complex parts at a low price. Fused deposition modeling (FDM) is one of the most popular 3D printing techniques currently on the market. Acrylonitrile butadiene styrene (ABS) or poly (lactic acid) (PLA) are the two most commonly used 3D printed materials. Dimensional accuracy of FDM processed 3D printed materials (PLA, ABS, PETG, and HIPS) and experimental investigation of the tensile properties of those materials is the main scope of this paper. Tensile testing machine SHIMADZU AGS-X 100 kN was used to carry out the experimental study.
PB  - The Military Technical Institute, Belgrade, Serbia
C3  - 9th International Scientific Conference on Defensive Technologies, OTEH 2020, October 15-16, Belgrade, Serbia
T1  - Dimensional accuracy and experimental investigation on tensile behavior of various 3D printed materials
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5431
ER  - 

@conference{
author = "Hasan, Sakib Mohammad and Ivanov, Toni and Tanović, Dragoljub and Simonović, Aleksandar and Vorkapić, Miloš",
year = "2020",
abstract = "Additive manufacturing (AM) or 3D printing is becoming very popular in the aerospace and defense industry because of its ability to manufacture complex parts at a low price. Fused deposition modeling (FDM) is one of the most popular 3D printing techniques currently on the market. Acrylonitrile butadiene styrene (ABS) or poly (lactic acid) (PLA) are the two most commonly used 3D printed materials. Dimensional accuracy of FDM processed 3D printed materials (PLA, ABS, PETG, and HIPS) and experimental investigation of the tensile properties of those materials is the main scope of this paper. Tensile testing machine SHIMADZU AGS-X 100 kN was used to carry out the experimental study.",
publisher = "The Military Technical Institute, Belgrade, Serbia",
journal = "9th International Scientific Conference on Defensive Technologies, OTEH 2020, October 15-16, Belgrade, Serbia",
title = "Dimensional accuracy and experimental investigation on tensile behavior of various 3D printed materials",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5431"
}

Hasan, S. M., Ivanov, T., Tanović, D., Simonović, A.,& Vorkapić, M.. (2020). Dimensional accuracy and experimental investigation on tensile behavior of various 3D printed materials. in 9th International Scientific Conference on Defensive Technologies, OTEH 2020, October 15-16, Belgrade, Serbia
The Military Technical Institute, Belgrade, Serbia..
https://hdl.handle.net/21.15107/rcub_machinery_5431

Hasan SM, Ivanov T, Tanović D, Simonović A, Vorkapić M. Dimensional accuracy and experimental investigation on tensile behavior of various 3D printed materials. in 9th International Scientific Conference on Defensive Technologies, OTEH 2020, October 15-16, Belgrade, Serbia. 2020;.
https://hdl.handle.net/21.15107/rcub_machinery_5431 .

Hasan, Sakib Mohammad, Ivanov, Toni, Tanović, Dragoljub, Simonović, Aleksandar, Vorkapić, Miloš, "Dimensional accuracy and experimental investigation on tensile behavior of various 3D printed materials" in 9th International Scientific Conference on Defensive Technologies, OTEH 2020, October 15-16, Belgrade, Serbia (2020),
https://hdl.handle.net/21.15107/rcub_machinery_5431 .