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Abstract
A model describing the initiation of hydrogen embrittlement cracks during square wave low cycle fatigue loading of blunt-notched specimens of high strength steels is presented. A quantitative analysis of the number of cycles required to initiate a crack is developed which assumes the rate-determining step to be the slow diffusion of hydrogen to the region of high triaxial stress ahead of the notch. The predictions of the analysis are in good qualitative agreement with the limited available experimental data.
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