球状黒鉛鋳鉄の疲労強度の統計的性質

概要

論文の詳細を見る
Rotating bending fatigue tests of smooth specimens were carried out at room temperature on a pearlitic ductile cast iron(PDI) and austempered ductile cast iron(ADI). No significant difference due to sampling position from cast blocks in both materials was found in fatigue limit and fatigue life distribution. Then, the statistical fatigue properties of ferritic(FDI), ferritic/pearlitic(FPDI), pearlitic and austemperd ductile cast irons were investigated. The fatigue life distributions of all ductile irons were well respresented by the three parameter Weibull distribution modified by the saturated probability of failure. The shape parameters of FDI, FPDI and PDI were in proportion to σ/σ_w independent on microstructure, while the shape parameters of both stress levels in ADI were smaller than unity. The fatigue strength of ADI was highest, but the scatter of fatigue life was largest among the all cast irons.
社団法人日本材料学会の論文
1995-09-15