TY  - JOUR
AU  - Arsić, Miodrag
AU  - Arsić, Dušan
AU  - Flajs, Željko
AU  - Grbović, Aleksandar
AU  - Todić, Aleksandar
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3536
AB  - Loads at vital steel structures occur during their production and assembly (residual stresses), during the execution of functional tasks in exploitation (stationary and dynamic loads) and during the disturbed process of exploitation (non-stationary dynamic loads). Considering the fact that stress concentrators, corrosion and unpredictable effects that occur during exploitation must be taken into account as well, it is clear that loading of vital structures during the design phase can not be represented with a model in which the parameters change uniformly. Therefore only experimental non-destructive tests performed at large steel structures during exploitation enable the assessment of their current condition, need for particular repairs and assessment of integrity. In that way the data necessary for determination of causes of degradation of material and welded joints at structures, for the evaluation of mutual influence of equipment parts, as well as for determination of functionality and reliability of operation of drive systems. This primarily refers to vital steel structures of bucket-wheel excavators, dredgers and cranes, as well as to vital steel structures at hydroelectric equipment, thermal power plant equipment, bridges etc. This paper presents the analysis of causes for the occurrence of damages at the support structure of the boom of the bucket-wheel excavator, which is operating at the open pit coal mine near Kostolac (Serbia), that was executed on the basis of non-destructive tests. The paper also contains the procedure for the repair of damaged structure through the application of adequate welding, performed at existing and newly produced components, and the assessment of structural integrity after the repair based on non-compliances detected during the design process, as well as during the making of the support structure of the bucket-wheel excavator boom due to inadequate radiuses defined during the processes of design and production and due to the existence of flaws on the surface and within welded joints.
PB  - Pleiades Publishing Inc, New York
T2  - Russian Journal of Nondestructive Testing
T1  - Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures
EP  - 931
IS  - 10
SP  - 918
VL  - 57
DO  - 10.1134/S1061830921100053
ER  - 

@article{
author = "Arsić, Miodrag and Arsić, Dušan and Flajs, Željko and Grbović, Aleksandar and Todić, Aleksandar",
year = "2021",
abstract = "Loads at vital steel structures occur during their production and assembly (residual stresses), during the execution of functional tasks in exploitation (stationary and dynamic loads) and during the disturbed process of exploitation (non-stationary dynamic loads). Considering the fact that stress concentrators, corrosion and unpredictable effects that occur during exploitation must be taken into account as well, it is clear that loading of vital structures during the design phase can not be represented with a model in which the parameters change uniformly. Therefore only experimental non-destructive tests performed at large steel structures during exploitation enable the assessment of their current condition, need for particular repairs and assessment of integrity. In that way the data necessary for determination of causes of degradation of material and welded joints at structures, for the evaluation of mutual influence of equipment parts, as well as for determination of functionality and reliability of operation of drive systems. This primarily refers to vital steel structures of bucket-wheel excavators, dredgers and cranes, as well as to vital steel structures at hydroelectric equipment, thermal power plant equipment, bridges etc. This paper presents the analysis of causes for the occurrence of damages at the support structure of the boom of the bucket-wheel excavator, which is operating at the open pit coal mine near Kostolac (Serbia), that was executed on the basis of non-destructive tests. The paper also contains the procedure for the repair of damaged structure through the application of adequate welding, performed at existing and newly produced components, and the assessment of structural integrity after the repair based on non-compliances detected during the design process, as well as during the making of the support structure of the bucket-wheel excavator boom due to inadequate radiuses defined during the processes of design and production and due to the existence of flaws on the surface and within welded joints.",
publisher = "Pleiades Publishing Inc, New York",
journal = "Russian Journal of Nondestructive Testing",
title = "Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures",
pages = "931-918",
number = "10",
volume = "57",
doi = "10.1134/S1061830921100053"
}

Arsić, M., Arsić, D., Flajs, Ž., Grbović, A.,& Todić, A.. (2021). Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures. in Russian Journal of Nondestructive Testing
Pleiades Publishing Inc, New York., 57(10), 918-931.
https://doi.org/10.1134/S1061830921100053

Arsić M, Arsić D, Flajs Ž, Grbović A, Todić A. Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures. in Russian Journal of Nondestructive Testing. 2021;57(10):918-931.
doi:10.1134/S1061830921100053 .

Arsić, Miodrag, Arsić, Dušan, Flajs, Željko, Grbović, Aleksandar, Todić, Aleksandar, "Application of Non-Destructive Testing for Condition Analysis, Repair of Damages and Integrity Assessment of Vital Steel Structures" in Russian Journal of Nondestructive Testing, 57, no. 10 (2021):918-931,
https://doi.org/10.1134/S1061830921100053 . .

TY  - JOUR
AU  - Popović, Olivera
AU  - Prokić-Cvetković, Radica
AU  - Radović, Ljubica
AU  - Burzić, Zijah
AU  - Arsić, Dušan
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3435
AB  - Surface welding of rail steel with self-shielded wire was conducted with different heat inputs, and the influence of welding heat input on the total impact energy and its components, crack growth rate and fracture mechanism was systematically investigated. It is shown that toughness decreases as heat input increases, but, with a temperature decrease, these differences are not so marked. An increase of heat input leads to increasing the share of transgranular brittle fracture, what is in complete accordance with the obtained energy values. It is established that fatigue life increases when increasing the welding heat input, while resistance to crack growth decreases in the final deposit layer up to the HAZ at all heat inputs. Based on obtained results, the optimal value of heat input is defined for the selected welding procedure.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - The effect of heat input on the fracture behaviour of surface weld metal of rail steel
EP  - 81
IS  - 1
SP  - 77
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3435
ER  - 

@article{
author = "Popović, Olivera and Prokić-Cvetković, Radica and Radović, Ljubica and Burzić, Zijah and Arsić, Dušan",
year = "2020",
abstract = "Surface welding of rail steel with self-shielded wire was conducted with different heat inputs, and the influence of welding heat input on the total impact energy and its components, crack growth rate and fracture mechanism was systematically investigated. It is shown that toughness decreases as heat input increases, but, with a temperature decrease, these differences are not so marked. An increase of heat input leads to increasing the share of transgranular brittle fracture, what is in complete accordance with the obtained energy values. It is established that fatigue life increases when increasing the welding heat input, while resistance to crack growth decreases in the final deposit layer up to the HAZ at all heat inputs. Based on obtained results, the optimal value of heat input is defined for the selected welding procedure.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "The effect of heat input on the fracture behaviour of surface weld metal of rail steel",
pages = "81-77",
number = "1",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3435"
}

Popović, O., Prokić-Cvetković, R., Radović, L., Burzić, Z.,& Arsić, D.. (2020). The effect of heat input on the fracture behaviour of surface weld metal of rail steel. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 20(1), 77-81.
https://hdl.handle.net/21.15107/rcub_machinery_3435

Popović O, Prokić-Cvetković R, Radović L, Burzić Z, Arsić D. The effect of heat input on the fracture behaviour of surface weld metal of rail steel. in Structural Integrity and Life. 2020;20(1):77-81.
https://hdl.handle.net/21.15107/rcub_machinery_3435 .

Popović, Olivera, Prokić-Cvetković, Radica, Radović, Ljubica, Burzić, Zijah, Arsić, Dušan, "The effect of heat input on the fracture behaviour of surface weld metal of rail steel" in Structural Integrity and Life, 20, no. 1 (2020):77-81,
https://hdl.handle.net/21.15107/rcub_machinery_3435 .

TY  - JOUR
AU  - Arsić, Dušan
AU  - Lazić, Vukić
AU  - Sedmak, Aleksandar
AU  - Aleksandrović, Srbislav
AU  - Zivković, Jelena
AU  - Đorđević, Milan
AU  - Mladenović, Goran
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3390
AB  - This paper presents an experimental and numerical study into the influence of elevated temperatures on mechanical properties of the heat treated high quality hot work tool steel H11. This steel belongs to a group of alloyed steels with extraordinary mechanical properties. The aim of this study was to determine the highest temperature at which these properties are still maintained. The experimental investigation focused on the tensile testing of specimens at seven different temperatures, including the room temperature. The highest testing temperature was 700 degrees C. The heat treatment of plates (specimens) consisted of quenching and tempering. Although the strain hardening of this type of materials is small, the strain hardening curves were calculated to show if there was a possibility for the material to increase its strength due to exploitation loads. Also, a numerical analysis of the tensile test by using the finite element method was done in order to define an appropriate model for numerical testing. The obtained results are then compared with the experimental results.
PB  - Univ Zagreb Fac Mechanical Engineering & Naval Architecture, Zagreb
T2  - Transactions of Famena
T1  - Effect of elevated temperatures on mechanical properties of ultra high strength hot work tool steel h11
EP  - 82
IS  - 2
SP  - 71
VL  - 44
DO  - 10.21278/TOF.44207
ER  - 

@article{
author = "Arsić, Dušan and Lazić, Vukić and Sedmak, Aleksandar and Aleksandrović, Srbislav and Zivković, Jelena and Đorđević, Milan and Mladenović, Goran",
year = "2020",
abstract = "This paper presents an experimental and numerical study into the influence of elevated temperatures on mechanical properties of the heat treated high quality hot work tool steel H11. This steel belongs to a group of alloyed steels with extraordinary mechanical properties. The aim of this study was to determine the highest temperature at which these properties are still maintained. The experimental investigation focused on the tensile testing of specimens at seven different temperatures, including the room temperature. The highest testing temperature was 700 degrees C. The heat treatment of plates (specimens) consisted of quenching and tempering. Although the strain hardening of this type of materials is small, the strain hardening curves were calculated to show if there was a possibility for the material to increase its strength due to exploitation loads. Also, a numerical analysis of the tensile test by using the finite element method was done in order to define an appropriate model for numerical testing. The obtained results are then compared with the experimental results.",
publisher = "Univ Zagreb Fac Mechanical Engineering & Naval Architecture, Zagreb",
journal = "Transactions of Famena",
title = "Effect of elevated temperatures on mechanical properties of ultra high strength hot work tool steel h11",
pages = "82-71",
number = "2",
volume = "44",
doi = "10.21278/TOF.44207"
}

Arsić, D., Lazić, V., Sedmak, A., Aleksandrović, S., Zivković, J., Đorđević, M.,& Mladenović, G.. (2020). Effect of elevated temperatures on mechanical properties of ultra high strength hot work tool steel h11. in Transactions of Famena
Univ Zagreb Fac Mechanical Engineering & Naval Architecture, Zagreb., 44(2), 71-82.
https://doi.org/10.21278/TOF.44207

Arsić D, Lazić V, Sedmak A, Aleksandrović S, Zivković J, Đorđević M, Mladenović G. Effect of elevated temperatures on mechanical properties of ultra high strength hot work tool steel h11. in Transactions of Famena. 2020;44(2):71-82.
doi:10.21278/TOF.44207 .

Arsić, Dušan, Lazić, Vukić, Sedmak, Aleksandar, Aleksandrović, Srbislav, Zivković, Jelena, Đorđević, Milan, Mladenović, Goran, "Effect of elevated temperatures on mechanical properties of ultra high strength hot work tool steel h11" in Transactions of Famena, 44, no. 2 (2020):71-82,
https://doi.org/10.21278/TOF.44207 . .

TY  - JOUR
AU  - Đorđević, Milan
AU  - Aleksandrović, Srbislav
AU  - Djacić, Slavisa
AU  - Sedmak, Aleksandar
AU  - Lazić, Vukić
AU  - Arsić, Dušan
AU  - Mutavdzić, Milan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2999
AB  - Influence of the contact pressure in the deep drawing processes is a very actual research topic in the metal forming technology. Within this research the tribological model of the strip sliding in the flat die was developed. The original experimental computerized apparatus for testing of the strip sliding in the variable contact pressure conditions was developed, as well. The complex, multi-factor experiment was performed by application of the Al thin sheet, with the contact elements of various roughnesses, with different lubricants application and with the variable contact pressure. Besides the description of the developed apparatus, the theoretical way for determination of the pressure dependences was also presented. Based on the theoretical changes of pressure, set in advance, the real influence of the contact pressure was obtained, for each of the given conditions. That makes possible to determine the influence of the tribological factors on the actual pressure. The obtained real contact pressure has verified the reliability of the experimental apparatus, namely the degree of the theoretical pressure dependences deviation from the real ones.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Simulation of Flat Die Deep Drawing Process by Variable Contact Pressure Sliding Model
EP  - 1204
IS  - 5
SP  - 1199
VL  - 26
DO  - 10.17559/TV-20161215205553
ER  - 

@article{
author = "Đorđević, Milan and Aleksandrović, Srbislav and Djacić, Slavisa and Sedmak, Aleksandar and Lazić, Vukić and Arsić, Dušan and Mutavdzić, Milan",
year = "2019",
abstract = "Influence of the contact pressure in the deep drawing processes is a very actual research topic in the metal forming technology. Within this research the tribological model of the strip sliding in the flat die was developed. The original experimental computerized apparatus for testing of the strip sliding in the variable contact pressure conditions was developed, as well. The complex, multi-factor experiment was performed by application of the Al thin sheet, with the contact elements of various roughnesses, with different lubricants application and with the variable contact pressure. Besides the description of the developed apparatus, the theoretical way for determination of the pressure dependences was also presented. Based on the theoretical changes of pressure, set in advance, the real influence of the contact pressure was obtained, for each of the given conditions. That makes possible to determine the influence of the tribological factors on the actual pressure. The obtained real contact pressure has verified the reliability of the experimental apparatus, namely the degree of the theoretical pressure dependences deviation from the real ones.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Simulation of Flat Die Deep Drawing Process by Variable Contact Pressure Sliding Model",
pages = "1204-1199",
number = "5",
volume = "26",
doi = "10.17559/TV-20161215205553"
}

Đorđević, M., Aleksandrović, S., Djacić, S., Sedmak, A., Lazić, V., Arsić, D.,& Mutavdzić, M.. (2019). Simulation of Flat Die Deep Drawing Process by Variable Contact Pressure Sliding Model. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 26(5), 1199-1204.
https://doi.org/10.17559/TV-20161215205553

Đorđević M, Aleksandrović S, Djacić S, Sedmak A, Lazić V, Arsić D, Mutavdzić M. Simulation of Flat Die Deep Drawing Process by Variable Contact Pressure Sliding Model. in Tehnički vjesnik. 2019;26(5):1199-1204.
doi:10.17559/TV-20161215205553 .

Đorđević, Milan, Aleksandrović, Srbislav, Djacić, Slavisa, Sedmak, Aleksandar, Lazić, Vukić, Arsić, Dušan, Mutavdzić, Milan, "Simulation of Flat Die Deep Drawing Process by Variable Contact Pressure Sliding Model" in Tehnički vjesnik, 26, no. 5 (2019):1199-1204,
https://doi.org/10.17559/TV-20161215205553 . .

TY  - JOUR
AU  - Arsić, Dušan
AU  - Gnjatović, Nebojša
AU  - Sedmak, Simon
AU  - Arsić, Aleksandra
AU  - Uhricik, Milan
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3056
AB  - In this paper are presented results of tests and analyses of complex dynamic loads carried out on the bucket-wheel excavator SchRs 650/5x24 Krupp, as well as assessment of service life of vital welded structures of a bucket-wheel excavator boom subjected to cyclic loading with a variable amplitude through the use of experimental tests carried out in order to determine operational strength and growth of a fatigue crack for one structural part. Bucket-wheel excavator was built by "Thyssen Krupp" company, Germany. Outer loads, or in other words digging forces for the overburden and coal have been calculated on the basis of measured values of actual current intensity of the bucket-wheel drive and recorded output values of changeable loads. Correlations between the power of the bucket-wheel drive system and adequate hourly production, depending on the overall digging resistance which affects the stress condition of the bucket-wheel, were also determined. Results of the theoretical and experimental analysis of natural and forced oscillations of the support structure for various exploitation conditions are presented in first part of the paper. Deformations epsilon(i) determined by tensometric measurements on the rotating shaft of the bucket-wheel were converted into tangential stresses through the introduction of the modulus of elasticity and Poisson's ratio, which, along with the polar moment of inertia of the cross-section, define the moment of rotation on the bucket-wheel shaft. Through the use of the load - strength comparison method (maximization of the ratio of load and strength indicators) the application factor of the gear with the largest number of turns K-A has been determined. In the second part of the paper methodological approach for the assessment of service life of vital welded structures of a bucket-wheel excavator boom was presented. Assessment was done in order to determine operational strength and growth of a fatigue crack, through the use of experimental tests. Realized researches and results presented in this paper offer great possibilities for the analyses of behaviour of vital welded structures of the bucket-wheel boom. By the application of the measurement device with 8 channels for registration and processing of electric signals HBM Spider 8 and measurement tapes HBM 6/350xXY31 deformations were measured at vital welded structures of the boom in the area of the bucket-wheel. The objective of the test is to determine if there is a possibility of occurrence of plastic deformations or initial cracks due to fatigue at vital welded structures and to obtain data which define crack growth.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Integrity assessment and determination of residual fatigue life of vital parts of bucket-wheel excavator operating under dynamic loads
EP  - 195
SP  - 182
VL  - 105
DO  - 10.1016/j.engfailanal.2019.06.072
ER  - 

@article{
author = "Arsić, Dušan and Gnjatović, Nebojša and Sedmak, Simon and Arsić, Aleksandra and Uhricik, Milan",
year = "2019",
abstract = "In this paper are presented results of tests and analyses of complex dynamic loads carried out on the bucket-wheel excavator SchRs 650/5x24 Krupp, as well as assessment of service life of vital welded structures of a bucket-wheel excavator boom subjected to cyclic loading with a variable amplitude through the use of experimental tests carried out in order to determine operational strength and growth of a fatigue crack for one structural part. Bucket-wheel excavator was built by "Thyssen Krupp" company, Germany. Outer loads, or in other words digging forces for the overburden and coal have been calculated on the basis of measured values of actual current intensity of the bucket-wheel drive and recorded output values of changeable loads. Correlations between the power of the bucket-wheel drive system and adequate hourly production, depending on the overall digging resistance which affects the stress condition of the bucket-wheel, were also determined. Results of the theoretical and experimental analysis of natural and forced oscillations of the support structure for various exploitation conditions are presented in first part of the paper. Deformations epsilon(i) determined by tensometric measurements on the rotating shaft of the bucket-wheel were converted into tangential stresses through the introduction of the modulus of elasticity and Poisson's ratio, which, along with the polar moment of inertia of the cross-section, define the moment of rotation on the bucket-wheel shaft. Through the use of the load - strength comparison method (maximization of the ratio of load and strength indicators) the application factor of the gear with the largest number of turns K-A has been determined. In the second part of the paper methodological approach for the assessment of service life of vital welded structures of a bucket-wheel excavator boom was presented. Assessment was done in order to determine operational strength and growth of a fatigue crack, through the use of experimental tests. Realized researches and results presented in this paper offer great possibilities for the analyses of behaviour of vital welded structures of the bucket-wheel boom. By the application of the measurement device with 8 channels for registration and processing of electric signals HBM Spider 8 and measurement tapes HBM 6/350xXY31 deformations were measured at vital welded structures of the boom in the area of the bucket-wheel. The objective of the test is to determine if there is a possibility of occurrence of plastic deformations or initial cracks due to fatigue at vital welded structures and to obtain data which define crack growth.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Integrity assessment and determination of residual fatigue life of vital parts of bucket-wheel excavator operating under dynamic loads",
pages = "195-182",
volume = "105",
doi = "10.1016/j.engfailanal.2019.06.072"
}

Arsić, D., Gnjatović, N., Sedmak, S., Arsić, A.,& Uhricik, M.. (2019). Integrity assessment and determination of residual fatigue life of vital parts of bucket-wheel excavator operating under dynamic loads. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 105, 182-195.
https://doi.org/10.1016/j.engfailanal.2019.06.072

Arsić D, Gnjatović N, Sedmak S, Arsić A, Uhricik M. Integrity assessment and determination of residual fatigue life of vital parts of bucket-wheel excavator operating under dynamic loads. in Engineering Failure Analysis. 2019;105:182-195.
doi:10.1016/j.engfailanal.2019.06.072 .

Arsić, Dušan, Gnjatović, Nebojša, Sedmak, Simon, Arsić, Aleksandra, Uhricik, Milan, "Integrity assessment and determination of residual fatigue life of vital parts of bucket-wheel excavator operating under dynamic loads" in Engineering Failure Analysis, 105 (2019):182-195,
https://doi.org/10.1016/j.engfailanal.2019.06.072 . .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Arsić, Dušan
AU  - Savić, Zoran
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5237
AB  - During the rehabilitation of turbine and hydromechanical equipment at hydro power plant 'Djerdap 1' results of tests and researches carried out in order to analyze the condition of vital components and structures during service led to the conclusion that the components and structures could be made only if parameters of fracture mechanics were applied during the design and prototyping phase, because by doing so the occurrence of fatigue fracture and/or degradation of parent material and welded joints due to variable loading, corrosion, erosion and cavitation would be prevented, therefore the integrity of material would be maintained. Experimental determination of the fatigue crack propagation rate as an important property of development of the fatigue process during the action of the variable load, from the initial to the critical length, enables the prediction of the stable crack propagation period, or in other words of the service life of vital components and structures of turbine and hydromechanical equipment. Taking into account the fact that cracks are most severe of all defects, the results obtained for cracks could safely be applied for other types of defects which often occur in welded joints. This
paper contains the methodological approaches for the assessment of integrity and evaluation of service life of components and structures of turbine and hydromechanical equipment during the design, prototyping and service period based on history of fatigue loading and application of fracture mechanics parameters.
PB  - University of Banja Luka-Faculty of Mechanical Engineering
C3  - Proceedings of the 14th International conference on accomplishments in mechanical and industrial engineering „DEMI 2019”
T1  - Prediction of service life of components and structures of hydro power plants during the design, prototyping and service period
EP  - 188
SP  - 183
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5237
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Arsić, Dušan and Savić, Zoran",
year = "2019",
abstract = "During the rehabilitation of turbine and hydromechanical equipment at hydro power plant 'Djerdap 1' results of tests and researches carried out in order to analyze the condition of vital components and structures during service led to the conclusion that the components and structures could be made only if parameters of fracture mechanics were applied during the design and prototyping phase, because by doing so the occurrence of fatigue fracture and/or degradation of parent material and welded joints due to variable loading, corrosion, erosion and cavitation would be prevented, therefore the integrity of material would be maintained. Experimental determination of the fatigue crack propagation rate as an important property of development of the fatigue process during the action of the variable load, from the initial to the critical length, enables the prediction of the stable crack propagation period, or in other words of the service life of vital components and structures of turbine and hydromechanical equipment. Taking into account the fact that cracks are most severe of all defects, the results obtained for cracks could safely be applied for other types of defects which often occur in welded joints. This
paper contains the methodological approaches for the assessment of integrity and evaluation of service life of components and structures of turbine and hydromechanical equipment during the design, prototyping and service period based on history of fatigue loading and application of fracture mechanics parameters.",
publisher = "University of Banja Luka-Faculty of Mechanical Engineering",
journal = "Proceedings of the 14th International conference on accomplishments in mechanical and industrial engineering „DEMI 2019”",
title = "Prediction of service life of components and structures of hydro power plants during the design, prototyping and service period",
pages = "188-183",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5237"
}

Arsić, M., Bošnjak, S., Grabulov, V., Arsić, D.,& Savić, Z.. (2019). Prediction of service life of components and structures of hydro power plants during the design, prototyping and service period. in Proceedings of the 14th International conference on accomplishments in mechanical and industrial engineering „DEMI 2019”
University of Banja Luka-Faculty of Mechanical Engineering., 183-188.
https://hdl.handle.net/21.15107/rcub_machinery_5237

Arsić M, Bošnjak S, Grabulov V, Arsić D, Savić Z. Prediction of service life of components and structures of hydro power plants during the design, prototyping and service period. in Proceedings of the 14th International conference on accomplishments in mechanical and industrial engineering „DEMI 2019”. 2019;:183-188.
https://hdl.handle.net/21.15107/rcub_machinery_5237 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Arsić, Dušan, Savić, Zoran, "Prediction of service life of components and structures of hydro power plants during the design, prototyping and service period" in Proceedings of the 14th International conference on accomplishments in mechanical and industrial engineering „DEMI 2019” (2019):183-188,
https://hdl.handle.net/21.15107/rcub_machinery_5237 .

TY  - JOUR
AU  - Ratković, Nada
AU  - Lazić, Vukić
AU  - Arsić, Dušan
AU  - Nikolić, Ružica R.
AU  - Prokić-Cvetković, Radica
AU  - Popović, Olivera
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2840
AB  - Purpose - The purpose of this paper is to point out the possibilities for friction welding of dissimilar steels which are used in various industries. In addition, friction welding is a welding method that is applied for executing the very responsible joints. This research is focused on friction and tribological processes in the friction plane of the two pieces during the welding. Design/methodology/approach - The present study research has been conducted based on the experimental testing of cylindrical specimens and results are analyzed. Findings - The austenite grain size is affected by several factors through the friction process phase and the compacting phase during the welding. The very fine grain is the consequence of the high degree of the plastic deformation of the near-the-contact layers even in the friction phase. The viscous layer, which is formed during the stable friction phase, is the area where the moving of matter occurs according to a very complex mechanism. Originality/value - The paper contains useful results from the area of conventional friction welding of dissimilar steels and it can be very useful to researchers and engineers who deal with similar problems.
PB  - Emerald Group Publishing Ltd, Bingley
T2  - Industrial Lubrication and Tribology
T1  - Microstructure in the joining zone during the friction welding of the two dissimilar steels
EP  - 407
IS  - 2
SP  - 401
VL  - 70
DO  - 10.1108/ILT-08-2017-0234
ER  - 

@article{
author = "Ratković, Nada and Lazić, Vukić and Arsić, Dušan and Nikolić, Ružica R. and Prokić-Cvetković, Radica and Popović, Olivera",
year = "2018",
abstract = "Purpose - The purpose of this paper is to point out the possibilities for friction welding of dissimilar steels which are used in various industries. In addition, friction welding is a welding method that is applied for executing the very responsible joints. This research is focused on friction and tribological processes in the friction plane of the two pieces during the welding. Design/methodology/approach - The present study research has been conducted based on the experimental testing of cylindrical specimens and results are analyzed. Findings - The austenite grain size is affected by several factors through the friction process phase and the compacting phase during the welding. The very fine grain is the consequence of the high degree of the plastic deformation of the near-the-contact layers even in the friction phase. The viscous layer, which is formed during the stable friction phase, is the area where the moving of matter occurs according to a very complex mechanism. Originality/value - The paper contains useful results from the area of conventional friction welding of dissimilar steels and it can be very useful to researchers and engineers who deal with similar problems.",
publisher = "Emerald Group Publishing Ltd, Bingley",
journal = "Industrial Lubrication and Tribology",
title = "Microstructure in the joining zone during the friction welding of the two dissimilar steels",
pages = "407-401",
number = "2",
volume = "70",
doi = "10.1108/ILT-08-2017-0234"
}

Ratković, N., Lazić, V., Arsić, D., Nikolić, R. R., Prokić-Cvetković, R.,& Popović, O.. (2018). Microstructure in the joining zone during the friction welding of the two dissimilar steels. in Industrial Lubrication and Tribology
Emerald Group Publishing Ltd, Bingley., 70(2), 401-407.
https://doi.org/10.1108/ILT-08-2017-0234

Ratković N, Lazić V, Arsić D, Nikolić RR, Prokić-Cvetković R, Popović O. Microstructure in the joining zone during the friction welding of the two dissimilar steels. in Industrial Lubrication and Tribology. 2018;70(2):401-407.
doi:10.1108/ILT-08-2017-0234 .

Ratković, Nada, Lazić, Vukić, Arsić, Dušan, Nikolić, Ružica R., Prokić-Cvetković, Radica, Popović, Olivera, "Microstructure in the joining zone during the friction welding of the two dissimilar steels" in Industrial Lubrication and Tribology, 70, no. 2 (2018):401-407,
https://doi.org/10.1108/ILT-08-2017-0234 . .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Savić, Zoran
AU  - Bošnjak, Srđan
AU  - Gašić, Vlada
AU  - Arsić, Dušan
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5260
AB  - Excavation, transport and spreading of barren soil and crude ore are being performed by a number of machines during the continuous production process at excavation sites, such as: bucket-wheel excava-tor; conveyor and spreader (so called ECS system). Failure of any machine in the technological chain leads to the failure of the whole system, and therefore it should be considered a structure with a serial connection. In this paper the results of non-destructive tests performed at welded joints and parent material (vi-sual testing, penetrant testing, ultrasonic testing, radiographic testing, hardness testing) on the basis of which the state analysis of components of the damaged structure, integrity evaluation of braces of the cutting and discharge boom and homogeneity of welded joints of newly _formed structures of the spreader A2Rs B 5500.55 + BRs at the excavation site 'Drnmo' near Kostolac, Serbia were perfor-med, are presented. Taking into account the fact that the user of the spreader does not own the design and technical documentation, all tests and researches presented in this paper were performed under the assumption that the lattice structures of both cutting and discharge boom were made of structural steels £955 and 5235, in accordance with standard EAT 10027-1.
PB  - Savez energetičara
T2  - Energija (Energija, ekonomija, ekologija)
T1  - State analysis of components of the damaged structure and integrity evaluation of braces at the spreader A2Rs – B 5500.55 + BRs
EP  - 261
IS  - 1-2
SP  - 257
VL  - 18
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5260
ER  - 

@article{
author = "Arsić, Miodrag and Savić, Zoran and Bošnjak, Srđan and Gašić, Vlada and Arsić, Dušan",
year = "2016",
abstract = "Excavation, transport and spreading of barren soil and crude ore are being performed by a number of machines during the continuous production process at excavation sites, such as: bucket-wheel excava-tor; conveyor and spreader (so called ECS system). Failure of any machine in the technological chain leads to the failure of the whole system, and therefore it should be considered a structure with a serial connection. In this paper the results of non-destructive tests performed at welded joints and parent material (vi-sual testing, penetrant testing, ultrasonic testing, radiographic testing, hardness testing) on the basis of which the state analysis of components of the damaged structure, integrity evaluation of braces of the cutting and discharge boom and homogeneity of welded joints of newly _formed structures of the spreader A2Rs B 5500.55 + BRs at the excavation site 'Drnmo' near Kostolac, Serbia were perfor-med, are presented. Taking into account the fact that the user of the spreader does not own the design and technical documentation, all tests and researches presented in this paper were performed under the assumption that the lattice structures of both cutting and discharge boom were made of structural steels £955 and 5235, in accordance with standard EAT 10027-1.",
publisher = "Savez energetičara",
journal = "Energija (Energija, ekonomija, ekologija)",
title = "State analysis of components of the damaged structure and integrity evaluation of braces at the spreader A2Rs – B 5500.55 + BRs",
pages = "261-257",
number = "1-2",
volume = "18",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5260"
}

Arsić, M., Savić, Z., Bošnjak, S., Gašić, V.,& Arsić, D.. (2016). State analysis of components of the damaged structure and integrity evaluation of braces at the spreader A2Rs – B 5500.55 + BRs. in Energija (Energija, ekonomija, ekologija)
Savez energetičara., 18(1-2), 257-261.
https://hdl.handle.net/21.15107/rcub_machinery_5260

Arsić M, Savić Z, Bošnjak S, Gašić V, Arsić D. State analysis of components of the damaged structure and integrity evaluation of braces at the spreader A2Rs – B 5500.55 + BRs. in Energija (Energija, ekonomija, ekologija). 2016;18(1-2):257-261.
https://hdl.handle.net/21.15107/rcub_machinery_5260 .

Arsić, Miodrag, Savić, Zoran, Bošnjak, Srđan, Gašić, Vlada, Arsić, Dušan, "State analysis of components of the damaged structure and integrity evaluation of braces at the spreader A2Rs – B 5500.55 + BRs" in Energija (Energija, ekonomija, ekologija), 18, no. 1-2 (2016):257-261,
https://hdl.handle.net/21.15107/rcub_machinery_5260 .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Arsić, Miodrag
AU  - Savićević, Sreten
AU  - Milojević, Goran
AU  - Arsić, Dušan
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2433
AB  - This paper presents the results of the pulley fracture analysis. Experimental investigations confirmed that the chemical composition and basic mechanical properties of the pulley material, except the impact energy at a temperature of - 20 degrees C, meet the requirements of the corresponding standard. The impact energy value at the temperature of - 20 degrees C is for approximate to 45% lower than the prescribed value which has considerable influence on the appearance of the brittle fracture, especially having in mind the fact that the bucket wheel excavators operate at low temperatures. Metallographic examinations as well as magnetic particle inspections indicated that initial cracks in the welded joints occurred during the manufacture of the pulleys. Characteristic levels of the rope load cycle are obtained by using in-house software which includes the dynamic effects of the resistance-to-excavation. The FEA results pointed out that in the representative load cases the combinations of the mean stress and the alternating stress in the pulley critical zone lie considerably below the limit line of the modified Goodman's diagram. The conclusion, based on the presented results, is that the fracture of the pulley appeared as the result of the 'manufacturing-in' defects.
PB  - Polish Maintenance Soc, Lublin
T2  - Eksploatacja I Niezawodnosc-Maintenance and Reliability
T1  - Fracture analysis of the pulley of a bucket wheel boom hoist system
EP  - 163
IS  - 2
SP  - 155
VL  - 18
DO  - 10.17531/ein.2016.2.1
ER  - 

@article{
author = "Bošnjak, Srđan and Arsić, Miodrag and Savićević, Sreten and Milojević, Goran and Arsić, Dušan",
year = "2016",
abstract = "This paper presents the results of the pulley fracture analysis. Experimental investigations confirmed that the chemical composition and basic mechanical properties of the pulley material, except the impact energy at a temperature of - 20 degrees C, meet the requirements of the corresponding standard. The impact energy value at the temperature of - 20 degrees C is for approximate to 45% lower than the prescribed value which has considerable influence on the appearance of the brittle fracture, especially having in mind the fact that the bucket wheel excavators operate at low temperatures. Metallographic examinations as well as magnetic particle inspections indicated that initial cracks in the welded joints occurred during the manufacture of the pulleys. Characteristic levels of the rope load cycle are obtained by using in-house software which includes the dynamic effects of the resistance-to-excavation. The FEA results pointed out that in the representative load cases the combinations of the mean stress and the alternating stress in the pulley critical zone lie considerably below the limit line of the modified Goodman's diagram. The conclusion, based on the presented results, is that the fracture of the pulley appeared as the result of the 'manufacturing-in' defects.",
publisher = "Polish Maintenance Soc, Lublin",
journal = "Eksploatacja I Niezawodnosc-Maintenance and Reliability",
title = "Fracture analysis of the pulley of a bucket wheel boom hoist system",
pages = "163-155",
number = "2",
volume = "18",
doi = "10.17531/ein.2016.2.1"
}

Bošnjak, S., Arsić, M., Savićević, S., Milojević, G.,& Arsić, D.. (2016). Fracture analysis of the pulley of a bucket wheel boom hoist system. in Eksploatacja I Niezawodnosc-Maintenance and Reliability
Polish Maintenance Soc, Lublin., 18(2), 155-163.
https://doi.org/10.17531/ein.2016.2.1

Bošnjak S, Arsić M, Savićević S, Milojević G, Arsić D. Fracture analysis of the pulley of a bucket wheel boom hoist system. in Eksploatacja I Niezawodnosc-Maintenance and Reliability. 2016;18(2):155-163.
doi:10.17531/ein.2016.2.1 .

Bošnjak, Srđan, Arsić, Miodrag, Savićević, Sreten, Milojević, Goran, Arsić, Dušan, "Fracture analysis of the pulley of a bucket wheel boom hoist system" in Eksploatacja I Niezawodnosc-Maintenance and Reliability, 18, no. 2 (2016):155-163,
https://doi.org/10.17531/ein.2016.2.1 . .