Abstract
• FE method to predict the fracture behavior under hydrogen environment is proposed. • Hydrogen embrittlement constant is introduced in the damage model. • The method is applied to test data of hydrogen-charged CF 21-6-9 stainless steel. • The predicted results agree well with experimental toughness data. In this paper, a finite element (FE) simulation method based on the multi-axial fracture strain model is proposed to predict the effect of hydrogen embrittlement on fracture toughness and is applied to test data on conventionally forged (CF) 21-6-9 stainless steel. For the uncharged material, the damage model parameters are determined from the tensile and fracture toughness test results. A hydrogen-embrittlement constant is introduced to modify the multi-axial fracture strain for hydrogen-charged materials. The predicted fracture toughness results using the modified multi-axial fracture strain agree closely with the experimental data of CF 21-6-9 stainless steel precharged at two different hydrogen concentrations, 78 and 210 wppm.
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