塑性 / 破面粗さおよび酸化物誘起き裂閉口の修正Dugdaleモデルによる解析

概要

論文の詳細を見る
Crack closure characteristics in fatigue crack growth were examined using the modified Dugdale model developed by Newman. The model can leave several elements in the wake of the advancing crack tip. First, plasticity induced crack closure was analyzed. The results gave a fairly good agreement with those obtained by finite element analysis or the Dugdale model. Applications of the model to crack surface roughness and oxide induced crack closure were attempted. Roughness or oxide debris near the crack tip causes a increase in opening stress intensity K_<op>. On the other hand, K_<op> decreases when they are located at the first contact point during unloading. It is also demonstrated that K_<op> increases as roughness of crack surfaces or the strength of oxide debris increases.
社団法人日本機械学会の論文
1985-01-25