TY  - JOUR
AU  - Swei, Mohamed
AU  - Sedmak, Aleksandar
AU  - Petrovski, Blagoj
AU  - Golubović, Zorana
AU  - Sedmak, Simon
AU  - Katinić, Marko
AU  - Azzabi, Khaled I.
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3180
AB  - The steels operating at elevated temperatures are well known to be exposed to premature failure due to cracking caused by constant thermal stress, i. e. secondary creep process. Therefore, creep crack growth tests were carried out on compact tension specimens machined from P91 weld joint at 600 degrees C to determine its behavior in realistic conditions. At the same time, numerical method for predicting the creep crack growth in compact tension specimens by a series of incremental steady-state finite element analysis were performed using Norton's law to represent creep behavior. Verification of the finite element predictions were obtained for weld metal and heat affected zone by comparison with experimental results, indicating at the same time that creep crack growth rates are significantly higher for weld metal than for base metal.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Creep crack growth behavior of p91 steel weldments
EP  - 1209
IS  - 2
SP  - 1203
VL  - 23
DO  - 10.2298/TSCI170729240S
ER  - 

@article{
author = "Swei, Mohamed and Sedmak, Aleksandar and Petrovski, Blagoj and Golubović, Zorana and Sedmak, Simon and Katinić, Marko and Azzabi, Khaled I.",
year = "2019",
abstract = "The steels operating at elevated temperatures are well known to be exposed to premature failure due to cracking caused by constant thermal stress, i. e. secondary creep process. Therefore, creep crack growth tests were carried out on compact tension specimens machined from P91 weld joint at 600 degrees C to determine its behavior in realistic conditions. At the same time, numerical method for predicting the creep crack growth in compact tension specimens by a series of incremental steady-state finite element analysis were performed using Norton's law to represent creep behavior. Verification of the finite element predictions were obtained for weld metal and heat affected zone by comparison with experimental results, indicating at the same time that creep crack growth rates are significantly higher for weld metal than for base metal.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Creep crack growth behavior of p91 steel weldments",
pages = "1209-1203",
number = "2",
volume = "23",
doi = "10.2298/TSCI170729240S"
}

Swei, M., Sedmak, A., Petrovski, B., Golubović, Z., Sedmak, S., Katinić, M.,& Azzabi, K. I.. (2019). Creep crack growth behavior of p91 steel weldments. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23(2), 1203-1209.
https://doi.org/10.2298/TSCI170729240S

Swei M, Sedmak A, Petrovski B, Golubović Z, Sedmak S, Katinić M, Azzabi KI. Creep crack growth behavior of p91 steel weldments. in Thermal Science. 2019;23(2):1203-1209.
doi:10.2298/TSCI170729240S .

Swei, Mohamed, Sedmak, Aleksandar, Petrovski, Blagoj, Golubović, Zorana, Sedmak, Simon, Katinić, Marko, Azzabi, Khaled I., "Creep crack growth behavior of p91 steel weldments" in Thermal Science, 23, no. 2 (2019):1203-1209,
https://doi.org/10.2298/TSCI170729240S . .

TY  - JOUR
AU  - Rakićević, Branislav
AU  - Maneski, Miloš
AU  - Mitić, Saša
AU  - Vorotović, Goran
AU  - Kozak, Dražan
AU  - Katinić, Marko
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2496
AB  - This paper focuses on the identification of failure causes of a bolted joint used for the bedding of a primary column of an aerial platform. The tests conducted to determine chemical composition and mechanical properties have confirmed the 12.9 grade of the bolts. Also, mechanical properties tests and metallographic examination did not indicate any hidden defects caused by heat treatment (e.g. decarburisation etc.). On the other hand, visual and metallographic examination of cross-section as well as electron microscope scanning confirmed fatigue fracture of the bolts. Therefore, further analyses were done to check the dimensioning and the installation of the bolts. The effects on stress states in the bolts are presented from the standpoint of rated operating regimes, stiffness of joined elements, lubrication conditions of thread surfaces and temperature incompatibility between the bolts and elements being joined. Pre-tightening torque value incompatible with lubrication conditions was found to be the main factor that led to high stress values that initiated and later intensified the fatigue process which ended in fatigue failure of the bolts.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Failure analysis of bolted joint for the column of an aerial platform
EP  - 1306
IS  - 5
SP  - 1301
VL  - 23
DO  - 10.17559/TV-20150513090840
ER  - 

@article{
author = "Rakićević, Branislav and Maneski, Miloš and Mitić, Saša and Vorotović, Goran and Kozak, Dražan and Katinić, Marko",
year = "2016",
abstract = "This paper focuses on the identification of failure causes of a bolted joint used for the bedding of a primary column of an aerial platform. The tests conducted to determine chemical composition and mechanical properties have confirmed the 12.9 grade of the bolts. Also, mechanical properties tests and metallographic examination did not indicate any hidden defects caused by heat treatment (e.g. decarburisation etc.). On the other hand, visual and metallographic examination of cross-section as well as electron microscope scanning confirmed fatigue fracture of the bolts. Therefore, further analyses were done to check the dimensioning and the installation of the bolts. The effects on stress states in the bolts are presented from the standpoint of rated operating regimes, stiffness of joined elements, lubrication conditions of thread surfaces and temperature incompatibility between the bolts and elements being joined. Pre-tightening torque value incompatible with lubrication conditions was found to be the main factor that led to high stress values that initiated and later intensified the fatigue process which ended in fatigue failure of the bolts.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Failure analysis of bolted joint for the column of an aerial platform",
pages = "1306-1301",
number = "5",
volume = "23",
doi = "10.17559/TV-20150513090840"
}

Rakićević, B., Maneski, M., Mitić, S., Vorotović, G., Kozak, D.,& Katinić, M.. (2016). Failure analysis of bolted joint for the column of an aerial platform. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 23(5), 1301-1306.
https://doi.org/10.17559/TV-20150513090840

Rakićević B, Maneski M, Mitić S, Vorotović G, Kozak D, Katinić M. Failure analysis of bolted joint for the column of an aerial platform. in Tehnički vjesnik. 2016;23(5):1301-1306.
doi:10.17559/TV-20150513090840 .

Rakićević, Branislav, Maneski, Miloš, Mitić, Saša, Vorotović, Goran, Kozak, Dražan, Katinić, Marko, "Failure analysis of bolted joint for the column of an aerial platform" in Tehnički vjesnik, 23, no. 5 (2016):1301-1306,
https://doi.org/10.17559/TV-20150513090840 . .

TY  - JOUR
AU  - Petrović, Branko
AU  - Petrović, Ana
AU  - Ignjatović, Dragan
AU  - Grozdanović, Ines
AU  - Kozak, Dražan
AU  - Katinić, Marko
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2482
AB  - Bucket wheel boom represents the most loaded and the most responsible part of the excavator structure, participating only with 6 to 13 % in the entire excavator weight. Its length is selected depending on the technological requirements of mining deposit, and it has to be adjusted with the designed possibilities of the excavator. At the request of mining technology that is in compliance with the soil-mechanical properties of deposit, conditions for the selection of excavator optimal parameters are created, and therefore for determining the required length of the boom. In this paper, analysis of dynamic and static behaviour of boom extended from 1 to 10m with a step 1m was done. The maximum possible extension is defined as the aspect of the structural performance, dynamic behaviour and stress field. Finite Element Method (FEM) is used to obtain natural frequencies, displacements and stresses.
PB  - Univ Osijek, Tech Fac, Slavonski Brod
T2  - Tehnički vjesnik
T1  - Assessment of the maximum possible extension of bucket wheel schrs740 boom based on static and dynamic calculation
EP  - 1238
IS  - 4
SP  - 1233
VL  - 23
DO  - 10.17559/TV-20151123152659
ER  - 

@article{
author = "Petrović, Branko and Petrović, Ana and Ignjatović, Dragan and Grozdanović, Ines and Kozak, Dražan and Katinić, Marko",
year = "2016",
abstract = "Bucket wheel boom represents the most loaded and the most responsible part of the excavator structure, participating only with 6 to 13 % in the entire excavator weight. Its length is selected depending on the technological requirements of mining deposit, and it has to be adjusted with the designed possibilities of the excavator. At the request of mining technology that is in compliance with the soil-mechanical properties of deposit, conditions for the selection of excavator optimal parameters are created, and therefore for determining the required length of the boom. In this paper, analysis of dynamic and static behaviour of boom extended from 1 to 10m with a step 1m was done. The maximum possible extension is defined as the aspect of the structural performance, dynamic behaviour and stress field. Finite Element Method (FEM) is used to obtain natural frequencies, displacements and stresses.",
publisher = "Univ Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnički vjesnik",
title = "Assessment of the maximum possible extension of bucket wheel schrs740 boom based on static and dynamic calculation",
pages = "1238-1233",
number = "4",
volume = "23",
doi = "10.17559/TV-20151123152659"
}

Petrović, B., Petrović, A., Ignjatović, D., Grozdanović, I., Kozak, D.,& Katinić, M.. (2016). Assessment of the maximum possible extension of bucket wheel schrs740 boom based on static and dynamic calculation. in Tehnički vjesnik
Univ Osijek, Tech Fac, Slavonski Brod., 23(4), 1233-1238.
https://doi.org/10.17559/TV-20151123152659

Petrović B, Petrović A, Ignjatović D, Grozdanović I, Kozak D, Katinić M. Assessment of the maximum possible extension of bucket wheel schrs740 boom based on static and dynamic calculation. in Tehnički vjesnik. 2016;23(4):1233-1238.
doi:10.17559/TV-20151123152659 .

Petrović, Branko, Petrović, Ana, Ignjatović, Dragan, Grozdanović, Ines, Kozak, Dražan, Katinić, Marko, "Assessment of the maximum possible extension of bucket wheel schrs740 boom based on static and dynamic calculation" in Tehnički vjesnik, 23, no. 4 (2016):1233-1238,
https://doi.org/10.17559/TV-20151123152659 . .