Prediction of environmentally assisted cracking behavior of structural material in LWR systems: Theory and experiments

Tetsuo Shoji, Yunju Lee, Takeshi Satoh, Shun Ichi Suzuki

Research output: Contribution to journalArticlepeer-review

Abstract

Quantitative prediction of environmentally assisted crack growth behavior of structural materials in corrosive environments is one of the greatest concerns for plant life management and consequent plant life extension. The formulation for prediction of EAC was developed based upon the Faraday's equation for metal dissolution and crack tip strain rate at a growing crack tip in an elastic/plastic work hardening material under either rising load or constant load. This formulation was also used to correlate the data obtained by different testing modes such as SSRT and constant load SCC tests. A crack growth rate under a constant load can be estimated experimentally by SSRT at a given dK/dt using fracture mechanics parameters, repassivation characteristic parameter, m and characteristic distance r, from a growing crack tip to define a plastic strain. In this work, we developed a methodology for evaluation of crack growth rate under constant load test from those obtained by SSRT The estimated crack growth rate under constant load from SSRT data based upon the formulation was compared with the experimental data. Emphasis is also focused on microsampling technique for a quantitative characterization of crack tip solution chemistry which controls a repassivation behavior at a crack tip.

Original languageEnglish
Pages (from-to)201-205
Number of pages5
JournalAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume374
Publication statusPublished - 1998 Dec 1

ASJC Scopus subject areas

  • Mechanical Engineering

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