Fracture toughness prediction of hydrogen-embrittled materials using small punch test data in Hydrogen

Ki Wan Seo, Jin Ha Hwang, Yun Jae Kim, Ki Seok Kim, Poh Sang Lam

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this paper, we propose a numerical methodology to predict the effect of hydrogen concentration on fracture toughness by using small punch (SP) test data in hydrogen. The proposed method performs finite element (FE) damage analysis, with the multi-axial fracture strain damage model based on. First, a damage model is derived from the tensile and fracture toughness test data obtained in air. Then, by simulating the SP test in hydrogen, the hydrogen-embrittlement constant is determined. Finally, fracture toughness of hydrogen-embrittled material is predicted using the determined damage model and hydrogen-embrittlement constant. To validate the proposed methodology, published test data of API X70 steel in hydrogen and air (or nitrogen) atmosphere are used. In terms of hydrogen concentration, the predicted fracture toughness agrees well with the fracture toughness test data obtained in hydrogen environment.

Original languageEnglish
Article number107371
JournalInternational Journal of Mechanical Sciences
Volume225
DOIs
Publication statusPublished - 2022 Jul 1

Keywords

  • Finite element damage analysis
  • Fracture toughness prediction
  • Hydrogen-embrittlement constant
  • Multi-axial fracture strain model
  • Small punch test

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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