Abstract
There are various types of structural components, which are subjected to hydrogen aggressive environment and cycling. Their unexpected failure occurs suddenly and may entail serious consequences such as emergency stop of equipment, failure of the structure etc. The special engineering models are developed to predict the crack kinetics in structure components, which are subjected both to hydrogen environment and to cycling simultaneously. These models enable estimation of structure component life. The paper considers some features of such empirically specified special model giving emphasis to the one of them, namely to the prevailing fracture mechanism transition from fatigue to hydrogen embrittlement and back in crack kinetics process.
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