Abstract
Crack closure during fatigue crack propagation is a phenomenon widely investigated in the last years by experimental means. Researches have achieved the knowledge of the different causes of the problem: the roughness-induced crack closure, the oxide -induced crack closure, the compressive stresses in the plastic zone near the crack tip produced by elastic unloading of the material (plasticity-induced crack closure), etc.. From these researches, several micromechanical models have been developed enabling the evaluation of the influence of microstructural parameters of the material on crack closure (1–2). Nevertheless, an analysis of the role played by the mechanical properties of the material and loading conditions requires using numerical methods.
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