Analysis of 316H creep crack initiation data at 550 °C using a crack tip constraint parameter

Seung Ho Lee, Hyun Woo Jung, Yun Jae Kim, Kamran Nikbin, Robert A. Ainsworth

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, 316H creep crack growth data at 550 °C are analysed to investigate the effect of in-plane constraint on creep crack initiation times. A constraint parameter is proposed to quantify the difference between an actual opening stress and the Riedel-Rice opening stress field in plane strain, using experimentally measured C*. Test data analysis shows that creep crack initiation times can be well characterized by the C* integral with the proposed parameter. A modified form of a model due to Nikbin, Smith and Webster is suggested, and scatter in predictions is shown to be reduced from ~40 to ~5.

Original languageEnglish
Article number107746
JournalEngineering Fracture Mechanics
Volume248
DOIs
Publication statusPublished - 2021 May 1

Keywords

  • 316H creep crack growth data at 550 °C
  • Creep crack initiation time
  • Creep crack tip constraint parameter

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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