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.
|ジャーナル||American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP|
|出版ステータス||Published - 1998 12 1|
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