Abstract
ABSTRACTA cyclic cohesive zone model (CZM) combined with the extended finite element method for the fatigue crack initiation and propagation in ductile materials was investigated under different loading conditions in C(T) specimens. Detailed experimental verification confirmed the known CZM could not predict effects of the loading ratio in fatigue crack properly. Including the loading ratio into the damage evolution equation described the loading ratio correctly. The CZM was used to predict both fatigue crack nucleation and propagation in a deep notched C(T) specimen. The simulations displayed reasonable agreement with experimental data in the stable stage of fatigue crack propagation and showed the potential for a unified description of fatigue crack nucleation and growth.
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