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Abstract: Fatigue crack characteristics are investigated based on
the dynamic response simulation by finite element and the dynamic
response experiments for tensile-shear spot-welded specimens. In the
different fatigue damage cumulative quantity, the dynamic response
frequency is measured during the fatigue damage process. The results
show that the natural frequency varies non-linearly with the fatigue
damage fraction. On the basis of the relationship between the crack
length and the natural frequency, the definition of fatigue crack
initiation stage is proposed. Fatigue crack initiation life is predicted
by the local stress and strain approach with the proposed fatigue crack
initiation stage for tensile-shear spot-welded specimens. The results
show that good agreement is achieved with experimental data.
Key words: 3D Finite element Spot-welded joint Fatigue crack
initiation and propagation Natural frequency Life prediction
CLC No: TH114
北京市自然科学基金(3042003)和北京市教委科技发展基金资助项目. Received 20040713,
received in revised form 20041228
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