Fatigue life assessment based on crack growth behavior in reduced activation ferritic/martensitic steel

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5 Citations (Scopus)

Abstract

Crack growth behavior under low cycle fatigue in reduced activation ferritic/martensitic steel, F82H IEA-heat (Fe-8Cr-2W-0.2V-0.02Ta), was investigated to improve the fatigue life assessment method of fusion reactor structural material. Low cycle fatigue test was carried out at room temperature in air at a total strain range of 0.4-1.5% using an hourglass-type miniature fatigue specimen. The relationship between the surface crack length and life fraction was described using one equation independent of the total strain range. Therefore, the fatigue life and residual life could be estimated using the surface crack length. Moreover, the microcrack initiation life could be estimated using the total strain range if there was a one-to-one correspondence between the total strain range and number of cycles to failure. The crack growth rate could be estimated using the total strain range and surface crack length by introducing the concept of the normalized crack growth rate.

Original languageEnglish
Pages (from-to)457-461
Number of pages5
Journaljournal of nuclear science and technology
Volume47
Issue number5
DOIs
Publication statusPublished - 2010

Keywords

  • Crack initiation
  • Crack propagation
  • F82H
  • Fusion reactor
  • Life assessment
  • Low cycle fatigue
  • Miniature specimen
  • Reduced activation ferritic/martensitic steel

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

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