Role of Mechanical Factors in Environmentally Enhanced Crack Growth under Cyclic Loading

Tetsuo Shoji, Hideaki Takahashi, Hajime Nakajima, Tatsuo Kondo

Research output: Contribution to journalArticle

Abstract

The role of mechanical factors in environmentally enhanced crack growth under cyclic loading was examined from a mechanistic view point in terms of time base crack growth rate in inert environment, [da/dt]inert, which was clarified to reflect the crack tip strain rate directly. Corrosion fatigue crack growth rate data in a simulated BWR environment at different stress ratios were compared with those obtained by the slow strain rate test (SSRT), aiming the direct correspondence on the growth rate diagram, [da/dt]E—[da/dt]inertdiagram. This diagram can be used to develope the mechanistically-based design rule for environmentally enhanced crack growth such as corrosion fatigue, stress corrosion cracking and slow strain rate tests on the pressure boundary materials in LWR environments. Furthermore, it provides a physical basis to understand the acceleration mechanism and also a useful tool to predict the maximum acceleration under conceivable operating conditions. Finally, the usefulness of SSRT coupled with fracture mechanics is emphasized from its applicability to predictive testing and toughness evaluation in terms of JIcor tearing modulus Tmatin aggresive environments.

Original languageEnglish
Pages (from-to)703-709
Number of pages7
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume31
Issue number346
DOIs
Publication statusPublished - 1982

ASJC Scopus subject areas

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

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