欠陥材の疲労限度の定量評価法と球状黒鉛鋳鉄によるその検証

抄録

In order to establish a quantitative evaluation method for the fatigue limit of materials with defects, a 4-parameter method, based on tensile strength σ_B, Vicker's hardness HV, threshold stress intensity range ΔK_th and maximum defect size a_max, was proposed and applied to three kinds of ductile cast iron and those austempered materials. As the result, the fatigue limit values estimated by the 4-parameter method agreed well with the experimental values.