大连理工大学学报2006，Vol.46Issue(z1)：29-32,4.
循环塑性与疲劳裂纹扩展门槛值
Cyclic plasticity and fatigue crack growth threshold
摘要
Abstract
Fatigue crack growth threshold is predicted based on material's cyclic plasticity. The model proposed emphasizes the influence of material's cyclic plasticity on fatigue crack growth. The value of J-integral within cohesive zone under cyclic loading is determined based on dislocation-free zone (DFZ) and cohesive zone theory. Then, the value of J-integral is regarded as fracture parameter and a criterion of crack growth is set up. The calculated curve of fatigue crack growth rate is in agreement with the general propagation pattern and the predicted threshold accords with the experiment threshold well. A prominent character of the present model is that the near threshold characteristics are most determined by the cyclic deformation behavior of the material, and are theoretically determinable from the standard cyclic loading test. This study should be of practical importance in engineering design.关键词
循环塑性/疲劳裂纹扩展/循环硬化/疲劳门槛值Key words
cyclic plasticity/fatigue crack growth/cyclic hardening/fatigue threshold分类
数理科学引用本文复制引用
张瑞,孙毅..循环塑性与疲劳裂纹扩展门槛值[J].大连理工大学学报,2006,46(z1):29-32,4.基金项目
哈尔滨工业大学基础研究基金项目.Supported by: Basic Research Foundation of Harbin Engineering University. （）
