METHOD FOR EVALUATING RESIDUAL LIFETIME OF METAL MATERIAL UTILIZING CREEP STRAIN RATIO

摘要

PROBLEM TO BE SOLVED: To provide a method for evaluating the residual lifetime of a metal material in which a high evaluation accuracy can be ensured even in the second half of lifetime consumption rate by utilizing the creep strain ratio. SOLUTION: Relation between the lifetime consumption rate and the creep strain or relation between the lifetime consumption rate and the variation rate of creep strain with respect to the variation rate of lifetime consumption rate is determined previously. Residual lifetime is evaluated with a high evaluation accuracy even in the second half of lifetime consumption rate from the creep strain ratio of the material being evaluated.