Quantification of pre-strain effect on ductile fracture and application to irradiation embrittlement problems

Ki Wan Seo, Yun Jae Kim, Ki Seok Kim

Research output: Contribution to journalArticlepeer-review

Abstract

This paper proposes a numerical method to predict fracture resistance of pre-strained materials, which is further applied to predict fracture resistance of irradiation-embrittled materials. The proposed method is based on a multi-axial fracture strain damage model using the fracture strain locus and critical damage. The key point is that the pre-strain effect on the critical damage is predicted using the pre-strain effect on plastic strain energy density of tensile data. Application to published experimental data for pre-strained SUS316 and SM490A shows that the predicted fracture toughness results agree well with experimental data. Based on published experimental results that the pre-strain effect on tensile and fracture toughness properties is similar to the irradiation effect, the proposed model is further applied to predict fracture toughness of irradiation-embrittled SUS316 material. Although only numerical simulation results are available, they show that maximum loads for irradiated specimens are higher than those for un-irradiated specimens. Furthermore, the effect of irradiation gradient along the crack growth direction is not so significant.

Original languageEnglish
Article number109986
JournalEngineering Fracture Mechanics
Volume300
DOIs
Publication statusPublished - 2024 Apr 16

Bibliographical note

Publisher Copyright:
© 2024 Elsevier Ltd

Keywords

  • FE damage analysis
  • Fracture strain model
  • Fracture toughness prediction
  • Irradiation-embrittlement effect on fracture
  • Quantification of pre-strain effect on fracture

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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