Abstract
A new model for the threshold stress intensity factor (KIH) for delayed hydride cracking (DHC) has been developed that account for the crack tip stress shielding by hydrides and plastic strains. The article reviews existing approaches to the evaluation of KIH and key features that govern the DHC process: hydride shape and stress field at the crack tip. The evaluation and validation of hydride length and thickness at the crack tip have been carried out. The new parametric model for KIH is based on a direct account for stress concentrator shielding by plastic zone and hydrides at the crack tip. The model results are in good agreement with experimental data.
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