球状黒鉛鋳鉄における表面疲労き裂の発生・進展寿命分布の確率特性

概要

論文の詳細を見る
Rotating bending fatigue tests were carried out smooth specimens of ferrite-base and mainly pearlite-base spheroidal graphite cast iron (FDI and PDI, respectively) at room temperature. The statistical properties of initiation and propagation lives of surface cracks and fatigue life were discussed in detail from results of successive observations of specimen surface. The distrubution of the initiation life N_i, the propagation process life N_<p1>, N_<p2> and the fracture life N_f, determined in this study, were well represented by a three-parameter Weibull distribution. The coefficient of variationηof those distributions decreased with increasing crack length 2_α during the fatigue process. The corrrelation coefficient in order Z of N_i, N_p for N_f increased with increasing 2_α, and in the lower stress level the Z reached about 1.0 in the early stage of fatigue (2_α=700μm).
社団法人日本機械学会の論文
1992-06-25