Paper Title:

Cyclic Plasticity and Fatigue Crack Growth

Periodical Key Engineering Materials (Volumes 324 - 325)
Main Theme Fracture and Damage Mechanics V
Edited by M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz
Pages 603-606
DOI 10.4028/www.scientific.net/KEM.324-325.603
Citation Rui Zhang et al., 2006, Key Engineering Materials, 324-325, 603
Online since November, 2006
Authors Rui Zhang, Sun Yi
Keywords Cyclic Hardening, Cyclic Plasticity, Fatigue Crack Growth, Fatigue Threshold
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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.