き裂エネルギ密度による安定成長き裂の破壊抵抗評価 : 第2報,薄板延性き裂への適用

抄録

The method proposed in the 1st Report for evaluating the fracture resistance of a stably growing crack by crack energy density is applied to the stable crack growth problems of thin plates, and its applicability and validity are confirmed. That is, the experiments of stable growth fractures of thin single-edge cracked specimens with different initial crack lengths under bending moment, and thin center cracked specimens also with different initial crack lengths under tensile force are carried out. The fracture resistances expressed by additional rates of crack energy density and crack energy density are evaluated, based on the results. When fracture modes are almost the same, fracture resistances have almost the same values regardless of initial crack lengths, and their values vary only corresponding to the change of fracture mode caused by crack extension. Also, the difference of specimen types has no remarkable influence on their values.