Modeling of fatigue crack closure by finite element method
Crack closure concept was often used to explain the crack propagation behavior in cracked components. The effective stress intensity factor range was considered as a driving force of fatigue crack propagation based on the traditional crack closure concept. The crack closure process and the plastic deformation near the crack tip were discussed in this paper. The standard compact tension specimens with the plane-stress condition were used to study the crack closure. A dynamic crack propagation method was proposed to simulate the effect of previous fatigue crack growth on the successive crack growth behavior. To obtain the accurately numerical results of stress and strain, the Jiang and Sehitoglu cyclic plasticity model was implemented into ABAQUS as UMAT. With the detailed stress and strain response taken from the finite element (FE) simulation, the whole process of crack closure was described by the load curve. The load corresponding to maximum crack closure length was firstly proposed to describe the effect of fatigue damage. According to the results of FE simulation, the cyclic plasticity of the material near the crack tip persisted during the crack closure period and should not be ignored.
Crack Closure Fatigue Damage Finite Element method
Zhenyu Ding Xiaogui Wang Zengliang Gao
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China
国际会议
武汉
英文
145-150
2012-07-29（万方平台首次上网日期，不代表论文的发表时间）