A new method to fatigue initiation and crack growth prediction
The current investigation was aiming to predict the fatigue initiation life and crack growth of the notched component under the constant amplitude loading. A new approach based upon the fatigue accumulative damage concept was adopted to predict fatigue life from crack initiation to final fracture. Compact tension specimens made of 16Mng steel were stud-ied. An elastic-plastic finite element (FE) analysis was conducted to obtain the detailed stress-strain history with a detailed consideration of the cyclic plasticity of the material using a robust cyclic plasticity model. A debonding scheme of one node per a few loading cycles was used to model the propagating crack in order to consider the effect of the loading his-tory on the crack growth. A multiaxial fatigue damage criterion was adopted to describe quantitatively the accumulated fatigue damage in the crack tip. The fatigue initiation life and the crack growth rate be directly obtained by the fatigue damage criterion. The fatigue initiation life,the predicted crack growth rate,and the total fatigue life based on the new approach were in excellent agreement with the experimental observations.
Crack growth Fatigue initiation Life prediction Propagating crack
Zengliang Gao Baoxiang Qiu Xiaogui Wang
Institute of Process Equipment and Control Engineering,Zhejiang University of Technology,Hangzhou 310032,China
国际会议
Fracture Mechanics and Applications 2008(国际断裂力学2008年年会)(FM2008)
杭州
英文
37-46
2008-10-31（万方平台首次上网日期，不代表论文的发表时间）