微小疲労き裂の開閉口挙動に及ぼす結晶粒界の影響

概要

論文の詳細を見る
The effect of the interaction between crack-tip slig band and grain boundary on plasticity induced crack closure was analyzed. On the basis of th method proposed by Budinansky and Hutchinson, the crack opening stress and the crack opning displacement were calculated for the constant and proportional resicual stretch models in which theresidual srech was assumed to be constant and proporsional along the crack surfaces, respectively. The crack opening stress and the crack opening displacement range decreased with increasing crack lennth. Then the simulation method developed by New-man was applied to crack growth. The crack opening stress increased with increasing crack length. The distribution of the residual stretch was geometrically similar to the change of the maximum crack opening displacement with crack length. The relation between the crack opening displacement range and the effective stress intensity range was almost unique irrespective of applied stress and boundary condition.
1993-06-15