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首页> 外文期刊>JSME International Journal. Series A >Effects of Material Brittle/Ductile Property and Crack Tip Loading Type on Fracture Mode of a Mixed-Mode Crack
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Effects of Material Brittle/Ductile Property and Crack Tip Loading Type on Fracture Mode of a Mixed-Mode Crack

机译：材料脆性/延性和裂纹尖端载荷类型对混合模式裂纹断裂模式的影响

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摘要

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 (in-plane shear) type or vice versa by changing the loading type in the vicinity of a crack tip. The characteristics of this fracture mode change may depend not only on the loading type in the vicinity of a crack tip but also on the brittle/ductile property of a material. From this point of view, the fracture experiments of the specimens with an inclined crack made up by using acrystal resin and aluminium alloy are carried out, in the present study, under tensile type and shearing type external loads. It is confirmed first through the experiments that the different fracture modes can be realized between the specimens of above two materials waven under the same loading type in the vicinity of a crack tip. Moreover, the CED in an arbitrary direction is evaluated through the finite element analyses corresponding to the experiments. Finally, it is demonstrated that the effects of brittle/ductile property of a material and loading type in the vicinity of a crack tip on fracture mode of a mixed-mode crack can be grasped in a unified way by the criterion based on the CED in an arbitrary direction.
机译：结果表明，通过改变裂纹附近的载荷类型，均质延性材料中混合模式裂纹的断裂模式从模式I（开口）变为模式II（面内剪切），反之亦然。小费。这种断裂模式变化的特性不仅取决于裂纹尖端附近的载荷类型，还取决于材料的脆性/延性。从这一观点出发，在本研究中，在拉伸型和剪切型外载荷下，进行了由无定形树脂和铝合金制成的具有倾斜裂纹的试样的断裂试验。首先通过实验证实，在裂纹尖端附近，在相同载荷类型下挥舞的两种以上材料的试样之间可以实现不同的断裂模式。此外，通过与实验相对应的有限元分析来评估任意方向的CED。最后，证明了基于CED的判据，可以统一掌握裂纹尖端附近材料的脆性/延性和载荷类型对混合模式裂纹断裂模式的影响。任意方向。

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