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前言从断裂力学分析,认为实际构件总是不可避免地存在着宏观裂纹或缺陷。在承受交变载荷作用时,裂纹缓慢地扩展,当裂纹达到临界尺寸时就发生脆性破坏。因此,研究疲劳裂纹扩展速率,对于决定构件的使用寿命以及选材设计都具有重要的意义。本文着重介绍用三点弯曲和读数显微镜方法对LC_4CS合金进行裂纹扩展速率的测定,并涉及了不同加载制度和不同组织状态对LC_4CS合金裂纹扩展速率的影响。
Preface From the fracture mechanics analysis, the actual components are always inevitably exist macro cracks or defects. When subjected to alternating loads, the crack propagates slowly and brittle failure occurs when the crack reaches a critical size. Therefore, the study of fatigue crack growth rate, for determining the service life of components and material selection are of great significance. This article focuses on the determination of the crack growth rate of LC_4CS alloy by three-point bending and reading microscopy, and discusses the influence of different loading regimes and different microstructures on the crack propagation rate of LC_4CS alloy.