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Entropy generation analysis of frictional heat-induced thermomechanical dissipation in railway brake discs
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DOI：10.1016/j.csite.2026.108375.png)
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Abstract
En 中文
This study proposes an entropy-generation-based approach for quantifying frictional heat-induced thermomechanical dissipation in railway brake discs during service. The total entropy generation is decomposed into thermal and mechanical components, corresponding to irreversible heat transfer and plastic deformation, respectively. A three-dimensional thermomechanical brake disc model is developed and validated against full-scale bench test results, and is then used to investigate the spatial and temporal entropy generation characteristics under multiple braking scenarios. The results show that entropy generation increases markedly with the initial braking speed, while the dominant dissipation mechanism varies with location and service period. During braking, thermal entropy generation is mainly concentrated in the mid-radius region of the friction surface because of intense heat input and steep temperature gradients. During cooling, the contribution of the radiating ribs becomes more prominent as heat is transferred from the disc body to the surrounding air, for the element in radiating rib region, more than 70% of the thermal entropy generation is accumulated during cooling. Mechanical entropy generation is primarily localized near bolt-hole edges and radiating-rib corners, where geometric discontinuities and interface constraints promote stress concentration and plastic strain accumulation. At higher initial speeds, the mechanical entropy generated during the cooling period becomes increasingly important and should not be neglected in thermomechanical damage evaluation, for the element in bolt-hole region, its cooling-period contribution increases from 28.75% at 250 km/h to 58.40% at 350 km/h. The proposed entropy-generation approach converts thermal and mechanical dissipation into a consistent quantitative metric, enabling integrated identification of thermally critical regions, fatigue-prone locations, and potential design-improvement targets in railway brake discs.
Keywords:
Railway brake disc
Thermomechanical dissipation
Entropy generation
Heat transfer
Plastic deformation
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