In low alloy steel,the combination of tension concentration and high hydrogen pressure results in environmentally induced cracking(EAC),also known as hydrogen induced cracking(HIC).This article's objective is to investigate the fracture mechanical behavior of 30CrMo steel,which is commonly used in high-pressure hydrogen storage pressure vessels,under high-pressure hydrogen environment.The finite element model of compact tensile specimen of 30CrMo steel was established by Abaqus/Explicit finite element software.The influence of stress intensity factor and defect fracture length on the distribution of mechanical field and hydrogen concentration field at crack tip is analyzed.A higher driving force for fracture propagation behavior is provided by an increase in the stress intensity factor at the crack tip,as demonstrated by the findings.In addition,during crack propagation,when the external load remains constant,the driving force of the crack tip progressively increases.The singular field at the tip of the fissure will prevent the ultimate distribution of diffusible hydrogen there.Except for the singular field at the crack tip,the hydrogen concentration field at the crack tip increases with the stress intensity factor and crack length.
30CrMo steelstress intensity factorcrack lengthcrack tip mechanical fieldhydrogen concentration field
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