Abstract
Abstract— Elastic‐plastic finite element analysis is used to study fatigue crack closure at three different crack length to width ratios for three plane stress specimen geometries: center‐cracked plate, single‐edge‐cracked plate (tension), and single‐edge‐cracked plate (bend). The maximum stress to flow stress ratio, Smax/σO, which successfully describes closure results in many center‐cracked plate configurations, does not correlate the effect of different geometries on the normalized opening stress, Sopen/Smax. Crack opening stresses for different geometries and crack lengths are successfully correlated by a normalized stress intensity parameter, Kmax/K0, where K0=σ0φa. The quality of the correlation is very high at small Kmax/K0, and gradually deteriorates as Kmax/K0 increases beyond the small‐scale yielding regime.
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