运动裂纹止裂判据的一种新提法

A New Arrest Criterion of the Moving Crack

从断裂动力学问题的非线性性质和能量观点出发，讨论了运动裂纹止裂判据的正确提法；指出了目前广泛使用的运动裂纹止裂判据的不适当性；提出了一种新的运动裂纹的止裂判据．研究表明。

On the basis of view of the non linear property and energy of the dynamic fracture problems, a correct expression of the moving crack arrest criterion is systematically discussed. It is pointed that the non suitable properties of the moving crack arrest criterion are improperly used. A new arrest criterion for the moving crack is proposed. It is shown that there is a minimum limit speed when crack unsteadily spreads.