The study investigates fatigue growth and shape evolution of a corner crack in a pin-loaded hole by means of three-dimensional FE analyses. The constraint factor/plasticity-induced crack closure strategy was tuned to reproduce experimentally measured crack front shapes. The study quantitatively determines the LEFM acceptability regions using elastic–plastic simulations. It also assesses the sensitivity of crack propagation and shape evolution to the stress distribution along the front, to the relationship between J-integral and stress intensity factor, and to changing propagation rates along different directions. The proposed approach produces very accurate results in terms of crack propagation rate and shape evolution.

该研究通过三维有限元分析研究了销加载孔中角裂纹的疲劳增长和形状演变。调整约束因子/塑性诱导裂纹闭合策略以重现实验测量的裂纹前沿形状。该研究使用弹塑性模拟定量确定 LEFM 可接受区域。它还评估了裂纹扩展和形状演化对前缘应力分布、J 积分与应力强度因子之间的关系以及沿不同方向变化的扩展速率的敏感性。所提出的方法在裂纹扩展速率和形状演变方面产生了非常准确的结果。