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

概要

論文の詳細を見る
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 N_i, growth life N_p and failure life N_f determined in this study were expressed as a two-parameter Weibull distribution. The statistical scatter of N_i, N_p and N_f 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 N_i, N_p and N_f distributions during the whole process. The relationship between the coefficient of variation η of N_f distribution and the slope a of S-N curves was expressed as η =c(a)^<-b>, where b and c are constants.
1988-03-25