受混合模式加载的倾斜边缘裂纹的疲劳裂纹路径(包括裂纹面摩擦)预测

Sjoerd T. Hengeveld , Davide Leonetti , Bert Snijder , Johan Maljaars
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引用次数: 0

摘要

准确描述疲劳裂纹生长速度和疲劳裂纹生长方向对于确定钢结构的剩余疲劳寿命,特别是铁路钢轨的剩余疲劳寿命至关重要。裂纹生长率和裂纹生长方向取决于裂纹驱动力。应力强度因子(SIF)通常被视为裂纹驱动力,它取决于外加载荷、裂纹长度和几何形状。本文对承受移动贴片载荷的钢轨斜边裂纹进行了数值研究,以评估其增长速度和方向,包括法向和切向应力分量。创建的二维有限元 (FE) 模型包括裂纹面之间的摩擦力。每次移动载荷通过后,裂纹都会沿预测方向逐渐扩展。对摩擦和牵引系数的影响进行了参数研究。比较了预测裂缝路径和 SIF 特性的结果。结果表明,摩擦和牵引对疲劳裂纹的增长速度和路径都有显著影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Prediction of fatigue crack paths including crack-face friction for an inclined edge crack subjected to mixed mode loading

Accurately describing the fatigue crack growth rate and fatigue crack growth direction is crucial in determining the residual fatigue life of steel structures in general and for railway rails in particular. The crack growth rate and crack growth direction depend on the crack driving force. The stress intensity factor (SIF) is often considered as crack driving force and it depends on the applied load, the crack length and geometry. This paper concerns a numerical investigation on an inclined edge crack in a rail subjected to a moving patch load to evaluate its growth rate and direction including both normal and tangential stress components. A 2D finite element (FE) model is created including friction between the crack faces. The crack is incrementally extended in the predicted direction after each passage of the moving load. A parametric study is conducted to study the effect of the friction and traction coefficients. The results are compared in terms of predicted crack paths and SIF characteristics. It is shown that both friction and traction have a significant influence on the fatigue crack growth rate and path.

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