Rising Load法による応力腐食割れの下限界特性の評価

概要

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The Top-on ultrasonic method proposed earlier is applied to rising load K_<ISCC> testing, and it is shown that the initiation behavior of stress corrosion cracking under monotonic loading can be accurately detected from an echo difference output voltage characteristics. Threshold stress intensity factor level below which no stress corrosion cracking will occur are evaluated both under charging hydrogen and in 3.5% by weight NaCl solution, and the validity of rising load K_<ISCC> testing based on the ultrasonic method is confirmed by comparing these K_<ISCC> values with that determined according to long time K_<ISCC> testing in the same environments. Moreover, the influences of loading rate, fatigue precracking level and fracture mechanism of precracked zone on K_< ISCC> are discussed.
社団法人日本機械学会の論文
1984-04-25