近二十年来,随着工程结构科学的发展,使断裂力学的理论日趋完善,并建立了一系列的断裂韧性测试技术和标准,如K_(IC)、COD J_(IC)、多试样阻力曲线和应力腐蚀K_(ISCC)等,它们在工程结构件的事故分析、疲劳寿命估计和应力腐蚀方面起了很大的作用,但是这些试验方法均属于静态范围,是在试验机上用缓慢的拉伸或弯曲来实现。然而在结构件的实际服役过程中,相当一部分构件并不是承受静态载荷,而是准静态,甚至是动态或冲击载荷,例如飞机起落架、爆炸武器、射击武器、推土和机械装卸设备,舰船用钢、核容器材料等,它们承受的载荷从零到极大值时,历时极短,是一种动态的加载 In recent twenty years, with the development of engineering structure science, the theory of fracture mechanics has been perfected day by day, and a series of fracture toughness testing techniques and standards have been established, such as K IC, COD J IC, Curve and stress corrosion K_ (ISCC) and so on. They play a very important role in the accident analysis, fatigue life estimation and stress corrosion of engineering structures. However, these test methods belong to the static range and are applied slowly on the testing machine Stretch or bend to achieve. However, during the actual service of the structure, a considerable part of the components are not subjected to static loads, but are quasi-static and even dynamic or impact loads such as aircraft landing gear, explosive weapons, firearms, bulldozers and mechanical handling equipment, ships Marine steel, nuclear container materials, which bear the load from zero to the maximum value, the lasted very short, is a dynamic load