高温クリープ・疲労重畳条件下におけるNi基合金切欠きのき裂発生と成長挙動

概要

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The crack initiation and growth behavior of Ni-based heat-resisting alloy was investigated in a vacuum environment at 1073 K using double edge notch test specimens, with varying holding times T_h at maximum stress during the cycle. The results showed that the crack growth rate could be evaluated by the C^*-integral because of the good correspondence of the crack growth rate and the notch opening displacement rate in the case of T_h≧50 s ; however, the crack growth rate did not correspond to the deformation of the test specimen in the other range of T_h. Relative notch opening displacement at the crack initiation, RNOD_c, indicated almost constant value and agreed with the results of SUS 304 stainless steel, except for the fatigue region.
一般社団法人日本機械学会の論文
1986-05-25