A study of ultra-low cycle fatigue failure based on a fracture strain energy model

Tao Wang, Jian Feng Wen, Peng Peng Liao, Xian Cheng Zhang, Yun Jae Kim, Shan Tung Tu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Ductile failure under ultra-low cycle fatigue (ULCF) loading is often the limit service state of a nuclear structure. In the paper, ULCF tests for a C-Mn-Si steel are carried out. It is observed that the fracture displacement decreases as the number of fatigue cycles increases. An energy-based model, which considers the effects of both stress triaxiality and cyclic loading on the critical fracture strain energy, is proposed. Coupled with the new model, finite element analyses of the round notched specimens can predict the equivalent plastic strain and the number of fatigue cycles to fracture within a scatter band of 1.5.

Original languageEnglish
Article number106149
JournalInternational Journal of Fatigue
Volume146
DOIs
Publication statusPublished - 2021 May

Keywords

  • Ductile fracture
  • Finite Element Analysis
  • Fracture strain energy
  • Seismic load
  • Ultra-low cycle fatigue (ULCF)

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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