Abstract
The effect of in-plane and out of plane constraints on the fatigue crack closure phenomenon is studied numerically by elastic-plastic finite element analysis. Three Dimensional Elastic-plastic finite element software is written to consider most aspects effecting plasticity induced crack closure. The paper presents results from the study carried out on a compact tension (CT) coupon at various crack lengths corresponding to different loading conditions. Finally the results of analysis are compared and evaluated with the earlier experimental estimates of fatigue crack closure levels obtained from transmission electron fractography and laser interferometry.
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