| 摘要 |
PROBLEM TO BE SOLVED: To create an SCC crack progress prediction expression under wide environmental conditions by obtaining a crack tip distortion speed and an active solution characteristic constant (n value) in the theoretical model expression of SCC crack progress, rearranging the n value with the independent variable of environmental/ material factors, and determining a parameter constant in an n-value analysis expression by the multivariate analysis. SOLUTION: The database of SCC(stress corrosion crack) crack progress is rearranged by environment/stress/material factors. The database and the theoretical model expression of SCC crack progress in high-temperature and high-pressure water are used to calculate a crack tip distortion speed and an n value in the theoretical model expression of the crack progress. Further, the calculated n value is used to determine a parameter constant in the analysis expression of the n value is determined by the multivariate analysis, and an SCC crack progress prediction expression in corrosion environment is created. The expression is a theoretical prediction expression based on a physical model consisting of an atomic theory mechanism due to stress at the crack tip part and an electrochemical mechanism due to environment and can be applied under wide conditions by appropriately selecting parameters and constants.
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