Finite element simulation method for combined Ductile-Brittle fracture of small punch test in hydrogen

Ki Wan Seo, Yun Jae Kim, Jin Ha Hwang, Ki Seok Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This paper presents a simulation method for combined ductile–brittle fracture of small punch (SP) test in hydrogen and application to test data of API X70 steel. For ductile fracture simulation, the multi-axial fracture strain damage model determined from un-embrittled material with the hydrogen-embrittlement constant determined from SP test in hydrogen is used. To simulate brittle fracture, the critical stress method is proposed, where the critical stress is determined using the V notch round bar tensile test in hydrogen. The determined models are applied to simulate the SP test in hydrogen showing combined ductile and brittle fracture mode. Simulation can well reproduce not only the load–displacement curve but also the circumferential ductile cracking, followed by radial brittle cracking, observed in the test.

Original languageEnglish
Article number109489
JournalEngineering Fracture Mechanics
Volume289
DOIs
Publication statusPublished - 2023 Sept 1

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • Combined ductile–brittle fracture simulation
  • Finite element analysis
  • Hydrogen-embrittlement
  • Small punch test

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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