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机械零构件在服役中的失效形式中主要的大量的是疲劳断裂。金属材料及其零件疲劳性能的研究,始终是本世纪以来材料科学和工程中一个极为重要的试验研究课题。
The main mass of failure of mechanical components during service is fatigue fracture. The research of fatigue properties of metal materials and their parts has always been a very important experimental research topic in material science and engineering since the beginning of this century.