中高温下疲労き裂進展下限界に及ぼすき裂開閉口の役割

概要

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fatigue crack growth and the threshold of SS41, SM41A, and SUS304 steels and 2218-T6 Al alloy were examined at elevated temperatures up to 500℃. An emphasis was made on examining the role of crack closure in the fatigue threshold at elevated temperatures. Fatigue threshold, ΔK_<th>, was found to increase with an increase in test temperatures for all the steels tested, while it was found to decrease for the 2218-T6 Al alloy. Oxide-induced crack closure was found to play an important role in the temperature dependence of ΔK_<th> for SM41A and 2218-T6 Al alloy, while it was found to play a less important role in the increase in ΔK_<th> at elevated temperatures for SS41 and SUS304 steels. The importance of the relative value of the oxide thickness to the CTOD at threshold was discussed.
社団法人日本機械学会の論文
1987-06-25