An accelerated test method for determining near-threshold stress intensity values in HSLA steels

G. Liu-Nash, J. A. Todd, S. Mostovoy

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

A new method for accelerating the collection of near-threshold corrosion fatigue crack propagation data, using local hydrogen embrittlement in the crack tip region, has been investigated for ASTM A710 HSLA steel. Fatigue tests were conducted at 10 and 0.2 Hz (stress ratio, R = 0.1) on "constant K" contoured double cantilever beam (CDCB) specimens, to establish near-threshold crack growth rates in a locally hydrogen charged region at the crack tip. Hydrogen charging was then discontinued and crack growth rates were monitored in the uncharged material. Near-threshold fatigue crack growth rates were found to be 100 times faster in the locally hydrogen charged specimens than in the uncharged material. Fatigue thresholds, ΔKth, were defined in less than one fifth the time required for load shedding tests in air at 0.2 Hz. Although demonstrated for HSLA steels, the technique is applicable to any material which can be embrittled by hydrogen.

Original languageEnglish (US)
Pages (from-to)1657-1664
Number of pages8
JournalFatigue and Fracture of Engineering Materials and Structures
Volume20
Issue number12
DOIs
StatePublished - Jan 1 1997

All Science Journal Classification (ASJC) codes

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

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