|
Abstract: On the basis of finite element analysis, the variation of natural frequency is studied for shear loaded two-spot welded specimens during the crack propagation process. The crack area is used to define the damage, with which established the relationship between the damage and the natural frequency variation ratio. The residual fatigue lives of specimens undergone a certain stage of fatigue damage are predicted according to the damage evolution principle in damage mechanics. The results showed that the proposed damage parameter can describe the fatigue process for the two-spot welded joints.
Key words: Natural frequency Fatigue damage
Finite element simulation Life prediction
CLC No: TG407 TH114 O346.2
北京市自然科学基金(3042003)和北京市属市管高等学校人才强教计划资助项目. Received 20060627, received in revised form 20070110
|