クリープき裂発生評価法とクリープき裂発生,成長挙動に及ぼす切欠き形状,試験片板幅効果

概要

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In this paper, we snow that creep crack propagation life is controlled by the size of the micro cracking region formed before crack initiation. Since, for a circular notch, the stress concentration factor is small compared with that for a V type sharp notch, the size of the micro cracking region is much larger than that for a V type sharp notch. So the creep crack propagation life becomes very short. These micro cracking regions are formed due to concentrated plastic deformation. But the relative notch opening displacement RNOD_c=Δφ_i/φ_o(Δφ_i=φ_i-φ_o,φ_i is the notch opening displacement at the crack initiation, φ_o : Initial notch opening displacement) is the accurate parameter of crack initiation, independent of such different creep crack propagation characteristics.
一般社団法人日本機械学会の論文
1986-05-25