機械構造用金属材料の低サイクル疲労強度と疲労き裂進展速度の関係について

概要

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The estimation of fatigue crack propagation rate in structural materials and the clarification of crack propagation mechanism are extremely important. In this study, a low cycle fatigue test and a fatigue crack propagation test were carried out. Then the relation between the low cycle fatigue strength and the fatigue crack propagation rate was investigated, and the factors affecting the fatigue crack propagation rate were clarified on the basis of a damage accumulation model. Consequently it was found that Young's modulus E, the fracture ductility ε_f and the yield strain ε_N considerably affected the fatigue crack propagation rate da/dN, and the following equation involving the effective stress intensity factor range ΔK_<eff> was proposed in order to consider the effect of material properties on the fatigue crack propagation rate. da/dN=506(ΔK_<eff>/E)^<2.79>/(ε_f√<ε_y>)
一般社団法人日本機械学会の論文
1997-01-25