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一、引言近年来把线弹性断裂力学的分析方法应用到动态应力的分析,而发展为动态断裂力学。其主要目的就是为了防止高压容器、船体等构件受到动载、地震及外来物的冲击或轻水原子反应堆失水事故产生热冲击的作用可能造成潜在裂纹的高速扩展,引起脆性断裂事故。如果在板材的厚度方向,在很小的范围内使高速扩展的裂纹停止下来,就可能防止重大事故的发
I. Introduction In recent years, the linear elastic fracture mechanics analysis method applied to the analysis of dynamic stress, and the development of dynamic fracture mechanics. Its main purpose is to prevent the high pressure vessel, hull and other components from being affected by the dynamic load, earthquakes and foreign objects or light water atomic reactor dehydration accident thermal shock may lead to the rapid expansion of potential cracks, causing brittle fracture. It is possible to prevent a fatal accident if the high-speed crack is stopped in a very small area in the thickness direction of the sheet