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笔者用新的测试手段测得了有超载和无超载情况下沿裂纹轴向的应变分布,并用改进后的方法预估了裂纹扩展速率.预估与实测吻合甚好。在此基础上探索了超载滞后的机制,并说明超载预应变是引起超载滞后的根本原因。
The author has measured the strain distribution along the crack axis under the condition of overloading and no overloading with the new test method and predicts the crack propagation rate with the improved method. Based on this, the mechanism of overload hysteresis is explored, and the overloading prestrain is the root cause of overload lag.