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  - Kalaba, Dragan V.
AU  - Đorđević, Milan
AU  - Kirin, Snežana
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2084
AB  - Representation of probabilistic technique for evaluation of thermal power system reliability is the main subject of this paper. The system of thermal power plant under study consists of three subsystems and the reliability assessment is based on a sixteen-year failure database. By applying the mathematical theory of reliability to exploitation research data and using complex two-parameter Weibull distribution, the theoretical reliability functions of specified system have been determined. Obtained probabilistic laws of failure occurrence have confirmed a hypothesis that the distribution of the observed random variable fully describes behaviour of such a system in terms of reliability. Shown results make possible to acquire a better knowledge of current state of the system, as well as a more accurate estimation of its behavior during future exploitation. Final benefit is opportunity for potential improvement of complex system maintenance policies aimed at the reduction of unexpected failure occurrences.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - determining the reliability function of the thermal power system in power plant "nikola tesla, block b1"
EP  - 800
IS  - 3
SP  - 793
VL  - 19
DO  - 10.2298/TSCI140610144K
ER  - 

@article{
author = "Kalaba, Dragan V. and Đorđević, Milan and Kirin, Snežana",
year = "2015",
abstract = "Representation of probabilistic technique for evaluation of thermal power system reliability is the main subject of this paper. The system of thermal power plant under study consists of three subsystems and the reliability assessment is based on a sixteen-year failure database. By applying the mathematical theory of reliability to exploitation research data and using complex two-parameter Weibull distribution, the theoretical reliability functions of specified system have been determined. Obtained probabilistic laws of failure occurrence have confirmed a hypothesis that the distribution of the observed random variable fully describes behaviour of such a system in terms of reliability. Shown results make possible to acquire a better knowledge of current state of the system, as well as a more accurate estimation of its behavior during future exploitation. Final benefit is opportunity for potential improvement of complex system maintenance policies aimed at the reduction of unexpected failure occurrences.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "determining the reliability function of the thermal power system in power plant "nikola tesla, block b1"",
pages = "800-793",
number = "3",
volume = "19",
doi = "10.2298/TSCI140610144K"
}

Kalaba, D. V., Đorđević, M.,& Kirin, S.. (2015). determining the reliability function of the thermal power system in power plant "nikola tesla, block b1". in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 19(3), 793-800.
https://doi.org/10.2298/TSCI140610144K

Kalaba DV, Đorđević M, Kirin S. determining the reliability function of the thermal power system in power plant "nikola tesla, block b1". in Thermal Science. 2015;19(3):793-800.
doi:10.2298/TSCI140610144K .

Kalaba, Dragan V., Đorđević, Milan, Kirin, Snežana, "determining the reliability function of the thermal power system in power plant "nikola tesla, block b1"" in Thermal Science, 19, no. 3 (2015):793-800,
https://doi.org/10.2298/TSCI140610144K . .

TY  - JOUR
AU  - Kalaba, Dragan V.
AU  - Radaković, Zoran
AU  - Đorđević, Milan Lj
AU  - Kirin, Snežana
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2010
AB  - The main subject of this paper is the representation of the probabilistic technique for thermal power system reliability assessment. Exploitation research of the reliability of the fossil fuel power plant system has defined the function, or the probabilistic law, according to which the random variable behaves (occurrence of complete unplanned standstill). Based on these data, and by applying the reliability theory to this particular system, using simple and complex Weibull distribution, a hypothesis has been confirmed that the distribution of the observed random variable fully describes the behaviour of such a system in terms of reliability. Establishing a comprehensive insight in the field of probabilistic power system reliability assessment technique could serve as an input for further research and development in the area of power system planning and operation.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Determining the theoretical reliability function of thermal power system using simple and complex weibull distribution
EP  - S238
SP  - S229
VL  - 18
DO  - 10.2298/TSCI120611168K
ER  - 

@article{
author = "Kalaba, Dragan V. and Radaković, Zoran and Đorđević, Milan Lj and Kirin, Snežana",
year = "2014",
abstract = "The main subject of this paper is the representation of the probabilistic technique for thermal power system reliability assessment. Exploitation research of the reliability of the fossil fuel power plant system has defined the function, or the probabilistic law, according to which the random variable behaves (occurrence of complete unplanned standstill). Based on these data, and by applying the reliability theory to this particular system, using simple and complex Weibull distribution, a hypothesis has been confirmed that the distribution of the observed random variable fully describes the behaviour of such a system in terms of reliability. Establishing a comprehensive insight in the field of probabilistic power system reliability assessment technique could serve as an input for further research and development in the area of power system planning and operation.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Determining the theoretical reliability function of thermal power system using simple and complex weibull distribution",
pages = "S238-S229",
volume = "18",
doi = "10.2298/TSCI120611168K"
}

Kalaba, D. V., Radaković, Z., Đorđević, M. L.,& Kirin, S.. (2014). Determining the theoretical reliability function of thermal power system using simple and complex weibull distribution. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 18, S229-S238.
https://doi.org/10.2298/TSCI120611168K

Kalaba DV, Radaković Z, Đorđević ML, Kirin S. Determining the theoretical reliability function of thermal power system using simple and complex weibull distribution. in Thermal Science. 2014;18:S229-S238.
doi:10.2298/TSCI120611168K .

Kalaba, Dragan V., Radaković, Zoran, Đorđević, Milan Lj, Kirin, Snežana, "Determining the theoretical reliability function of thermal power system using simple and complex weibull distribution" in Thermal Science, 18 (2014):S229-S238,
https://doi.org/10.2298/TSCI120611168K . .