A Fracture Strain Based Numerical Prediction Method For Hydrogen Effect on Fracture Toughness

Gyo Geun Youn, Yun Jae Kim, Jong Sung Kim, Poh Sang Lam

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


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.

Original languageEnglish
Article number106492
JournalInternational Journal of Mechanical Sciences
Publication statusPublished - 2021 Jul 15

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd


  • CF 21-6-9 stainless steel
  • finite element damage analysis
  • fracture toughness
  • hydrogen-embrittlement effect

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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