表面疲労き裂の発生,伝ぱおよび破断寿命のばらつき特性に及ぼす材料組織の影響
1988 年 54 巻 499 号 p. 426-431
詳細
1988 年 54 巻 499 号 p. 426-431
Rotating bending fatigue tests were carried out for three metals; low carbon steel (S15C) with four grain sizes, pure copper and austenitic stainless steel (SUS 304). The distributions of crack initiation life Ni, growth life Np and failure life Nf determined in this study were expressed as a two-parameter Weibull distribution. The statistical scatter of Ni, Np and Nf distributions increased roughly with increases in grain size, except the smallest one and with decreases in stacking fault energy, and decreased with the development of fatigue cycles. The SUS304 showed the higest value of the correlation coefficient between Ni, Np and Nf distributions during the whole process. The relationship between the coefficient of variation η of Nf distribution and the slope a of S-N curves was expressed as η =c(a)-b, where b and c are constants.
