機械構造用材料の疲労き裂進展抵抗とき裂開閉口挙動

概要

論文の詳細を見る
"Fatigue crack growth behavior and its governing factors were investigated by analysing the test data obtained under K-increasing conditions on various structural materials. The fatigue crack growth rate curves exhibited a trilinear form in the so-called Region II. This trilinear form also appeared in the relationship of da/dn versus the effective stress intensity range ΔK_<eff> and the transition points in the relationship corresponded to those in the plot of the crack opening ratio U againstΔK_<eff>. Irrespective of materials, the effect of stress ratio on the crack growth rate can be well evaluated in terms of ΔK_<eff>. The fracture ductility of material ε_f was found to exert a considerable effect on the fatigue crack growth rate and the following empirical equation was proposed to account for the effect of material properties on the crack growth rate; da/dn=c/(√<ε_f>)((ΔK_<eff>)/E)^m"
社団法人日本材料学会の論文
1984-04-15