Affiliation:
1. Harbin Institute of Technology
Abstract
The relation between material’s cyclic plastic behavior and fatigue crack growth is
investigated. The present model is proposed on the dislocation-free zone (DFZ) theory. A cohesive
zone theory is developed to determine the stress field of the DFZ and the value of J-integer under
cyclic loading. The crack growth criterion is proposed based on J-integral. The calculated curve of
fatigue crack growth rate da/dN is agreement with the general propagation pattern and the predicted
threshold accords with the experiment threshold well. It is found that the near threshold
characteristics are most determined by the cyclic deformation behavior of the material. The relation
between fatigue crack growth threshold and material’s cyclic hardening behavior is discussed.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science