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首页> 外文期刊>International Journal of Fatigue >Fatigue crack growth model including load sequence effects - Model development and calibration for railway axle steels
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Fatigue crack growth model including load sequence effects - Model development and calibration for railway axle steels

机译：疲劳裂纹扩展模型，包括载荷序列效应-铁路车轴钢的模型开发和校准

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摘要

Beside well-known influence factors like residual stresses, component and crack geometry also load sequence effects significantly impact the crack propagation rate. In this paper two major load sequence effects, namely overloads and small loads, and their particular influence on the fatigue crack growth are investigated in detail. Both effects lead to a retardation in the crack propagation rate by increasing the plasticity-induced (overload) or the oxide-induced (small loads) crack closure. To develop a holistic fatigue crack growth model including the short crack behaviour as well as load sequence effects, the NASGRO equation is modified accordingly. This improved fatigue crack growth approach is calibrated for two common material grades for railway axles, namely EA4T and EA1N, and implemented into crack growth assessment software tools.
机译：除了众所周知的影响因素，例如残余应力，构件和裂纹几何形状，载荷顺序效应还显着影响裂纹扩展速率。本文详细研究了两个主要的载荷序列效应，即过载和小载荷，以及它们对疲劳裂纹扩展的特殊影响。通过增加塑性引起的（超载）或氧化物引起的（小载荷）裂纹闭合，这两种作用都会导致裂纹扩展速率的降低。为了建立包括短裂纹行为以及载荷序列效应在内的整体疲劳裂纹扩展模型，对NASGRO方程进行相应修改。针对铁路车轴的两种常见材料等级EA4T和EA1N对这种改进的疲劳裂纹扩展方法进行了校准，并将其实施到裂纹扩展评估软件工具中。

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