Determination of temperature stresses in CWR based on measured rail surface temperatures
Само за регистроване кориснике
2021
Аутори
Mirković, NikolaBrajović, Ljiljana
Popović, Zdenka
Todorović, Goran
Lazarević, Luka
Petrović, Miloš
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
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 C...WR. 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.
Кључне речи:
Railway / Continuously welded rail / Temperature measurement system / Thermal-stress analysis / Temperature distribution / Temperature stress / Temperature force / Temperature strainИзвор:
Construction and Building Materials, 2021, 284, 122713Издавач:
- Elsevier
Финансирање / пројекти:
Колекције
Институција/група
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