有効応力拡大係数範囲ΔK_<eff>による疲労き裂伝ぱ挙動の評価に関して

概要

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Fatigue crack propagation law in the following two cases was investigared under the negative stress ratio R (=σ_<min>/σ_<max>) condition.The one is the crack propagation in the field of welding-residual stress,and the other is that after the overloading.In the former case,the crack propagation rate da/dN depended on the stress ratio R.Due to the tensile residual stress,the crack propagation tate increased as the stress ratio dectrased in the range of 0≦R≦-2.In the latter case,the crack propagation rate da/dN after the overloading was higher at first and then became lower than that of the constant stress amplitude.In the present exerimental cases,the crack propagarion rate was affected by the residual stress and the overloading.However,the crack propagarion behavior had a good correlation with the crack closure behavior.Therefore,in the present cases,the crack propagarion law was reasonanly evaluated with the effective stress intensity factor range ΔK_<eff>.
社団法人日本材料学会の論文
1993-10-15