Modeling of fatigue crack growth based on two cyclic plasticity models
Based on two different cyclic plasticity models,fatigue crack growth for 16MnR steelspecimens is simulated by using the same multi-axial fatigue damage criterion.The first plasticitymodel is the Jiang and Sehitoglu model and the second plasticity model is the simple nonlinearkinematic hardening model.The elastic-plastic stress-strain field near the crack tip is obtainedrespectively by using the two plasticity models.According to the same fatigue criterion,differentfatigue damage near the crack tip is determined on the basis of stress-strain responses.The firstplasticity model can accurately capture cyclic plasticity deformation behavior and predictions offatigue crack growth rate are in agreement with the experimental results.However,lots of materialconstants in the model need to be fitted and more experimental tests should be conducted.The secondplasticity model is very simple.The parameters of the model can be acquired easily by uniaxial fatiguetests.Compared with experimental data,the prediction results of fatigue crack growth rate lead tosome errors by adopting the second plasticity model.
cyclic plasticity fatigue crack growth finite element analysis kinematic hardening multi-axial fatigue criterion
W.F.Tu X.G.Wang Z.L.Gao
Zhejiang University of Technology,College of Mechanical Engineering,The MOE Key Laboratory of Mechan Zhejiang University of Technology,College of Mechanical Engineering,The MOE Key Laboratory of Mechan
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）