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首页> 外文期刊>International Journal of Vehicle Noise and Vibration >Subsurface crack propagation with different inclusion under a wheel-flat LEFM analysis using dynamics conditions
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Subsurface crack propagation with different inclusion under a wheel-flat LEFM analysis using dynamics conditions

机译：利用动力学条件在轮式LEFM分析下具有不同夹杂物的地下裂纹扩展

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摘要

Railway wheels fail owing to fatigue during long runs. During running frequent braking and jamming of brakes causes wheels to skid over rails and material to be removed from the tread. This frequent skidding that removes large amounts of metal from the surface is known as wheel-flat defect. In this paper the model of the wheel with 'flat' defect using FEA and a subsurface crack in the vicinity of the defect is studied. Owing to rolling contact fatigue the subsurface crack propagates and removes a large material from the tread. If flat defect is not detected early the subsurface crack can originate in the vicinity owing to the presence of a cavity or inclusion and may lead to fatal accidents. Stress intensity factor has been obtained for the crack propagation caused by the original subsurface crack. The wheel-rail is modelled as a mass-spring-damper system to simulate the basic wheel-rail dynamics.
机译：由于长期疲劳，铁路车轮会失效。在行驶过程中，频繁的制动和制动器卡死会导致车轮在导轨上打滑，并从胎面上去除材料。这种从表面上去除大量金属的频繁打滑被称为漏气保用缺陷。在本文中，使用有限元分析和具有缺陷附近表面下裂纹的“平坦”缺陷车轮模型进行了研究。由于滚动接触疲劳，表面裂纹扩展并从胎面去除大量材料。如果未及早发现平坦缺陷，则由于存在空腔或夹杂物，地下裂纹可能起源于附近，并可能导致致命事故。已经获得了由原始地下裂纹引起的裂纹扩展的应力强度因子。轮轨建模为质量弹簧阻尼器系统，以模拟基本的轮轨动力学。

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