Simulation of fatigue initiation and non-self-similar fatigue crack growth under mixed mode I/II loading
The fatigue initiation and non-self-similar fatigue crack growth behavior of three notched compact tension and shear specimens of 16MnR steel under mixed mode I/II loading were investigated. The planestress finite element model with the implemented Armstrong-Frederick type cyclic plasticity model was used to calculate the elastic-plastic stress-strain responses. A recently developed dynamic crack growth model was used to simulate the effects of loading history on the successive crack growth. With the outputted numerical results, a multiaxial fatigue damage criterion based on the critical plane was used to determine the location of fatigue initiation. A formula of fatigue crack growth rate, which is based on the postulation that the fatigue initiation and crack growth have the same damage mechanism, was then used to calculate the transient crack growth rate and determine the non-self-similar crack growth path. The predicted fatigue initiation position, crack path and crack growth rate are in excellent agreement with the experimental data.
Mixed mode I/II Crack path Crack growth rate Loading history
Chenchen Ma Xiaogui Wang
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China
国际会议
黄山
英文
303-306
2012-07-10（万方平台首次上网日期，不代表论文的发表时间）