| 摘要 |
PROBLEM TO BE SOLVED: To predict the growth rate of development of stress corrosion cracking, even under complicated residual stress of a nuclear reactor structure etc. and K-distribution conditions. SOLUTION: A crack-tip strain rateε'<SB>ct</SB>is expressed by a function of a stress intensity factor K and the rate of change dK/da of the stress intensity factor with respect to crack length, and the crack growth rate da/dt is predicted, on the basis of the crack-tip strain rate. The crack-tip strain rateε'<SB>ct</SB>is computed, by dividing the crack-tip opening rate dδ/dt by the reference distanceδ<SB>0</SB>. By further expressing the crack-tip opening rate dδ/dt, by the function of the stress intensity factor K and the rate of change dK/da of the stress intensity factor to crack length, the crack growth rate da/dt is predicted. COPYRIGHT: (C)2007,JPO&INPIT
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