Abstract
A new hydrogen embrittlement fracture model is proposed based on the discrete distributed dislocation method. The effect of hydrogen atoms distribution at the crack tip on dislocation emission before micro-crack nucleation in the early stage of corrosion fracture is investigated. The results show that hydrogen can promote the emission, diffusion and movement of dislocations, increasing the plastic zone at the crack tip. In the hydrogen environment, the critical stress intensity factor of the crystalline material decreases by a maximum of about 11%. Within the theoretical framework of this model, it is believed that hydrogen atoms accumulated closest to the crack tip will promote the emission of dislocations from the crack tip, thereby suppressing passivation of the crack while promoting brittle fracture of metallic materials. These results are helpful to analyze the hydrogen embrittlement fracture behavior of the material.
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