TY  - JOUR
AU  - Mirković, Nikola
AU  - Brajović, Ljiljana
AU  - Popović, Zdenka
AU  - Todorović, Goran
AU  - Lazarević, Luka
AU  - Petrović, Miloš
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2312
AB  - The main aim of conducted research is determination of temperature stresses due to the uneven temperature
distribution in CWR. This paper presents a methodology for determination of temperature stresses
in CWR based on (1) measurement system developed by the authors for measurement of rail surface temperatures,
and (2) coupled transient thermal-stress analysis for simulation of rail temperature field and
corresponding stresses. The main advantages of the proposed methodology are high sensitivity to the
small temperature variations, taking into account the effect of thermal inertia, as well as measurement
of single input parameter - rail surface temperature. The obtained experimental results showed lower rail
temperatures in sleeper zones and rail foot along CWR, which emphasize the effect of heat transfer
between rail and sleeper, as well as rail foot and ballast. These effects of heat transfer directly influence
the decrease of temperature stresses in the mentioned zones of CWR. The maximum values of simulated
temperature stresses are up to 16% less in the centre of gravity of railhead, up to 9.8% less in the centre of
gravity of rail foot, and up to 0.2% less in the centre of gravity of rail web, compared to the common engineering
calculation. In addition, the maximum value of simulated temperature force, based on temperature
stresses in the rail cross-section, was up to 5.3% less than the value obtained in the common
engineering calculation.
PB  - Elsevier
T2  - Construction and Building Materials
T1  - Determination of temperature stresses in CWR based on measured rail surface temperatures
IS  - 122713
VL  - 284
DO  - 10.1016/j.conbuildmat.2021.122713
ER  - 

@article{
author = "Mirković, Nikola and Brajović, Ljiljana and Popović, Zdenka and Todorović, Goran and Lazarević, Luka and Petrović, Miloš",
year = "2021",
abstract = "The main aim of conducted research is determination of temperature stresses due to the uneven temperature
distribution in CWR. This paper presents a methodology for determination of temperature stresses
in CWR based on (1) measurement system developed by the authors for measurement of rail surface temperatures,
and (2) coupled transient thermal-stress analysis for simulation of rail temperature field and
corresponding stresses. The main advantages of the proposed methodology are high sensitivity to the
small temperature variations, taking into account the effect of thermal inertia, as well as measurement
of single input parameter - rail surface temperature. The obtained experimental results showed lower rail
temperatures in sleeper zones and rail foot along CWR, which emphasize the effect of heat transfer
between rail and sleeper, as well as rail foot and ballast. These effects of heat transfer directly influence
the decrease of temperature stresses in the mentioned zones of CWR. The maximum values of simulated
temperature stresses are up to 16% less in the centre of gravity of railhead, up to 9.8% less in the centre of
gravity of rail foot, and up to 0.2% less in the centre of gravity of rail web, compared to the common engineering
calculation. In addition, the maximum value of simulated temperature force, based on temperature
stresses in the rail cross-section, was up to 5.3% less than the value obtained in the common
engineering calculation.",
publisher = "Elsevier",
journal = "Construction and Building Materials",
title = "Determination of temperature stresses in CWR based on measured rail surface temperatures",
number = "122713",
volume = "284",
doi = "10.1016/j.conbuildmat.2021.122713"
}

Mirković, N., Brajović, L., Popović, Z., Todorović, G., Lazarević, L.,& Petrović, M.. (2021). Determination of temperature stresses in CWR based on measured rail surface temperatures. in Construction and Building Materials
Elsevier., 284(122713).
https://doi.org/10.1016/j.conbuildmat.2021.122713

Mirković N, Brajović L, Popović Z, Todorović G, Lazarević L, Petrović M. Determination of temperature stresses in CWR based on measured rail surface temperatures. in Construction and Building Materials. 2021;284(122713).
doi:10.1016/j.conbuildmat.2021.122713 .

Mirković, Nikola, Brajović, Ljiljana, Popović, Zdenka, Todorović, Goran, Lazarević, Luka, Petrović, Miloš, "Determination of temperature stresses in CWR based on measured rail surface temperatures" in Construction and Building Materials, 284, no. 122713 (2021),
https://doi.org/10.1016/j.conbuildmat.2021.122713 . .

TY  - JOUR
AU  - Petrović, Miloš
AU  - Mihailović, Pedja
AU  - Brajović, Ljiljana
AU  - Petricević, Slobodan
AU  - Živković, Irena
AU  - Kojović, Aleksandar
AU  - Radojević, Vesna
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/796
AB  - In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function validity were presented. To detect any possible dangerous impact, a net of crossed fibers was proposed and the net spacing for the given material was calculated. Appropriate non-damaging calibration procedure was proposed, as well as the algorithm for locating the impact point. The method for calculating the impact force, the projectile momentum change, and the place of impact was verified by consecutive strikes on the previously calibrated sample. The sensor can also provide information on the time of the impact and an alarm signal if the force exceeds the damaging threshold force.
PB  - Institute of Electrical and Electronics Engineers Inc.
T2  - Ieee Sensors Journal
T1  - Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester
EP  - 3053
IS  - 9
SP  - 3047
VL  - 16
DO  - 10.1109/JSEN.2016.2524045
ER  - 

@article{
author = "Petrović, Miloš and Mihailović, Pedja and Brajović, Ljiljana and Petricević, Slobodan and Živković, Irena and Kojović, Aleksandar and Radojević, Vesna",
year = "2016",
abstract = "In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function validity were presented. To detect any possible dangerous impact, a net of crossed fibers was proposed and the net spacing for the given material was calculated. Appropriate non-damaging calibration procedure was proposed, as well as the algorithm for locating the impact point. The method for calculating the impact force, the projectile momentum change, and the place of impact was verified by consecutive strikes on the previously calibrated sample. The sensor can also provide information on the time of the impact and an alarm signal if the force exceeds the damaging threshold force.",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
journal = "Ieee Sensors Journal",
title = "Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester",
pages = "3053-3047",
number = "9",
volume = "16",
doi = "10.1109/JSEN.2016.2524045"
}

Petrović, M., Mihailović, P., Brajović, L., Petricević, S., Živković, I., Kojović, A.,& Radojević, V.. (2016). Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester. in Ieee Sensors Journal
Institute of Electrical and Electronics Engineers Inc.., 16(9), 3047-3053.
https://doi.org/10.1109/JSEN.2016.2524045

Petrović M, Mihailović P, Brajović L, Petricević S, Živković I, Kojović A, Radojević V. Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester. in Ieee Sensors Journal. 2016;16(9):3047-3053.
doi:10.1109/JSEN.2016.2524045 .

Petrović, Miloš, Mihailović, Pedja, Brajović, Ljiljana, Petricević, Slobodan, Živković, Irena, Kojović, Aleksandar, Radojević, Vesna, "Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester" in Ieee Sensors Journal, 16, no. 9 (2016):3047-3053,
https://doi.org/10.1109/JSEN.2016.2524045 . .