Effect of creep-fatigue loading condition on crack tip fields of grade 91 steel at crack initiation and growth

Hyun Woo Jung, Yun Jae Kim, Yukio Takahashi

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, the effect of creep-fatigue loading condition on crack tip deformation and stress fields of Grade 91 steel at 600 °C at crack initiation and growth is studied. By using finite element debond analysis method, creep-fatigue crack growth tests using C(T) specimens under various load ratios and hold times are simulated, and the effect of creep-fatigue load ratio and hold time on the crack opening profile, equivalent stress, crack-opening stress and triaxiality at crack initiation and growth is presented. It is found that the crack tip deformation and stress fields under tension–compression creep-fatigue loading are overall different from those under tension-tension creep-fatigue and pure creep loading, due to re-sharpening of the crack tip.

Original languageEnglish
Pages (from-to)127-135
Number of pages9
JournalInternational Journal of Fracture
Volume231
Issue number1
DOIs
Publication statusPublished - 2021 Sep

Keywords

  • Crack growth
  • Crack initiation
  • Crack tip stress fields
  • Creep fatigue

ASJC Scopus subject areas

  • Computational Mechanics
  • Modelling and Simulation
  • Mechanics of Materials

Fingerprint

Dive into the research topics of 'Effect of creep-fatigue loading condition on crack tip fields of grade 91 steel at crack initiation and growth'. Together they form a unique fingerprint.

Cite this