弹塑性疲劳裂纹扩展的应变累积模型  

A Strain Accumulation Model of Elastic-Plastic Fatigue Crack Growth

作　　者：史建平[1] 吴玉树[1] 林吉忠[1] 

机构地区：[1]铁道部科学研究院

出　　处：《中国铁道科学》1996年第3期83-93,共11页China Railway Science

摘　　要：本文通过实验研究指出：弹塑性疲劳裂纹的扩展，是一个裂尖钝化启裂和裂纹稳定扩展交替进行的过程，其扩展机制为能量累积型或应变累积型。在对裂尖弹塑性应力应变分析的基础上，作者建立了疲劳裂纹扩展的应变累积模型。该模型数学表达式具有半理论、半经验性质，能较好地反映弹塑性疲劳裂纹扩展的物理特征。On the basis of experiment and research efforts, the paper points out that the growth of elastic-plastic fatigue crack(EPFC) is a course of alternate crack-tip blunting,initiating and stable growth. The growth mechanism is of the mode of energy or strain accumulation. Then, the strain accumulation model of EPFC growth is presented based on an analysis of elastic-plastic stress and strain at the crack-tip. The mathematical expression of this model is half theoretical and half empirical in nature and can well represent the physical characteristics of EPFC growth.

关 键 词：弹塑性 疲劳裂纹 扩展机制 应变累积模型 

分 类 号：O346[理学—固体力学]