混合モードき裂の破壊モードに及ぼす材料のぜい性・延性およびき裂端負荷様式の影響

概要

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It was shown that the fracture mode of a mixed-mode crack in a homogeneous ductile material changes from mode I (opening type) to mode II (shear type) or vice versa by changing the loading type in the neighborhood of a crack tip. The characteristics of this fracture mode change may depend not only on the loading type but also on the brittle/ductile property of a material. Thus, in the present study, the fracture experiments of the specimens with an inclined crack made up by using acryl resin and aluminum alloy are carried out under tensile and shear type loadings and it is confirmed that the different fracture modes can be realized between the specimens of above two materials even under the same loading type. Moreover, the CED in an arbitrary direction is evaluated through the finite element analyses corresponding to the experiments. Finally, it is shown that the observed fracture phenomena can be explained and the effects of brittle/ductile property of a material and loading type at the crack tip on fracture mode of a mixed mode crack can also be grasped in a unified way, by the fracture criteria based on the CED in an arbitrary direction.
社団法人日本機械学会の論文
1998-11-25