Effect of pre-strain history on small crack growth under Low Cycle fatigue for JIS SFVQ1A steel

Shota Hasunuma, Yohei Miyata, Kenichi Sakaue, Takeshi Ogawa

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Low cycle fatigue tests were performed for a low alloy steel, JIS SFVQ1A, used for pressure vessels of nuclear power plants. The effect of pre-strain history on the small crack initiation and growth was investigated in detail using cellulose acetate replicas. Under the tests in which the total strain range, Δ ε, is constant, surface crack length, 2c, was smaller for the tests with larger Δ ε due to the different numbers of small crack initiation and coalescence. The pre-strain histories were applied at Δ ε of 8 or 16% with its fatigue usage factor, UF, of less than 0.2, followed by fatigue loading at Δ ε = 2% until fracture. In these tests, the relationships between 2c and UF agreed with each other unless crack coalescence occurred. The scatter in fatigue life was attributed to the coalescences of small cracks. Fracture mechanics approach was applied to predict the fatigue lives and to characterize the growth behavior of small fatigue cracks.

Original languageEnglish
Pages (from-to)210-216
Number of pages7
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume60
Issue number3
DOIs
Publication statusPublished - 2011 Mar 1

Keywords

  • Fatigue crack growth
  • Fatigue crack initiation
  • Fatigue life
  • Low alloy steel
  • Low cycle fatigue
  • Pre-strain history

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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