裂纹闭合行为将很大程度改变疲劳裂纹扩展行为。针对316L不锈钢，结合常幅加载和单个拉伸过载试验和动态数值模拟方法，对疲劳裂纹扩展行为中的裂纹闭合现象开展了一系列研究工作。详细对比了不同扩展阶段的裂纹闭合行为随裂纹长度、应力比和过载影响因素的变化，以及对裂纹扩展速率的影响。同时，研究了单个拉伸过载和裂纹闭合行为之间的内在联系和机理。结合裂纹闭合理论和有限元计算结果，等效应力强度因子被用来描述316L不锈钢的裂纹扩展过程，并提出316L不锈钢的裂纹扩展速率的预测模型。
The behaviour of fatigue crack growth was significantly changed by the closure behavior of fatigue crack. The crack closure behaviour of 316L stainless steel was investigated by combining the loading test and the numerical simulation to study the dynamic crack propagation. The fatigue crack growth experiment included the constant amplitude loading and single tensile overload. The crack closure behaviour and the crack growth rate in different propagation peri-od were studied with different crack length,stress ratio and overload. The intrinsic mechanisation between the single ten-sile overload and the crack closure was discussed. An improved model to calculate the effective stress intensity factor range was applied based on the theory of crack closure and the calculated results. The prediction formulation of crack growth rate was fitted about the 316L steel.
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