Effects of hydrogen-altered yielding and work hardening on plastic-zone evolution: A finite-element analysis

Daisuke Sasaki, Motomichi Koyama, Kenji Higashida, Kaneaki Tsuzaki, Hiroshi Noguchi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Abstract In the present paper, finite-element analysis of a cracked specimen was conducted using a unified model for the elastic-plastic deformation and hydrogen diffusion. We considered the effects of the hydrogen-reduced yielding strength and work-hardening coefficient and used a comparison parameter in the simulation of the hydrogen-localized plastic zone near a crack tip. We realized two important facts: (1) the normal component of the plastic strain in the direction of remote stress near the crack tip is significantly increased by the reduced work-hardening coefficient at the same stress-intensity factor; (2) the reduced work-hardening coefficient enhances the localization of the plastic zone when compared to the case using the normal component of the crack-tip plastic strain in the direction of remote stress, which probably determines the ductile-brittle transition of the fatigue-crack propagation mode under a hydrogen atmosphere. These results indicate that the reduction in work-hardening coefficient and the utilization of the crack-tip plastic strain as a parameter to organize the data play important roles in the prediction of the transition condition of hydrogen-accelerated fatigue-crack propagation.

Original languageEnglish
Article number16071
Pages (from-to)9825-9837
Number of pages13
JournalInternational Journal of Hydrogen Energy
Volume40
Issue number31
DOIs
Publication statusPublished - Aug 17 2015

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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