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首页> 外文会议>International Conference on Structural Integrity and Fracture, SIF 2002, Sep 25-27, 2002, Perth, Australia >Size effect and crack bridging in coarse-microstructure composites
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Size effect and crack bridging in coarse-microstructure composites

机译：粗微结构复合材料的尺寸效应和裂纹桥接

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摘要

Size and ligament effects on the specific fracture energy defined by the area under a crack bridging stress and crack opening displacement curve are explained by a boundary effect concept. A boundary or an outer zone is assumed to exist around a specimen or structure, where many factors including fracture process zone, material microstructure and distance of crack-tip to a boundary will influence the crack growth process and then the specific fracture energy. Based on the relation between the locally and globally defined specific fracture energies, the influence of a boundary zone on the globally averaged fracture energy is evaluated. It is shown from measurements of the global fracture energy that the bridging stress and crack opening relationship is not unique within the boundary zone because of the variation in the local specific fracture energy which is directly related to the bridging stress and crack opening relationship.
机译：边界效应概念解释了尺寸和韧带对特定断裂能的影响，该比断裂能由裂缝桥接应力和裂缝开口位移曲线下的面积确定。假定在试样或结构周围存在边界或外部区域，其中许多因素（包括断裂过程区域，材料微观结构和裂纹尖端到边界的距离）将影响裂纹扩展过程，进而影响比断裂能。基于局部和全局定义的特定断裂能之间的关系，评估边界区域对全局平均断裂能的影响。从整体断裂能的测量结果表明，由于局部比断裂能的变化与边界应力和裂纹张开关系直接相关，因此在边界区内桥应力和裂纹张开关系并不是唯一的。

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