A Fracture Strain Based Numerical Prediction Method For Hydrogen Effect on Fracture Toughness. (15th July 2021)

• Record Type: Journal Article
• Authors: Youn, Gyo-Geun; Kim, Yun-Jae; Kim, Jong-Sung; Lam, Poh-Sang
• Is Part Of: International journal of mechanical sciences. Volume 202/203(2021)
• Publication Date: 2021-07-15
• Subjects: CF 21-6-9 stainless steel -- hydrogen-embrittlement effect -- fracture toughness -- finite element damage analysis; Mechanical engineering -- Periodicals; Génie mécanique -- Périodiques; Mechanical engineering; Maschinenbau; Mechanik; Zeitschrift; Periodicals; 621.05
• DOI: 10.1016/j.ijmecsci.2021.106492
• Languages: English
• ISSNs: 0020-7403

Abstract

Highlights: 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. ABSTRACT: 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. Graphical abstracts: Image, graphical abstract