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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 >Crack Propagation in Graded Alumina-Polyester Composites
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Crack Propagation in Graded Alumina-Polyester Composites

机译：梯度氧化铝-聚酯复合材料的裂纹扩展

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摘要

In joining materials with significantly different properties, stress at the interface may be minimised by incorporating a compositionally graded region. Often cracks propagating through such regions experience crack-bridging due to significantly differing failure strains of component phases. In addition, a gradient in elastic properties may lead to mixed-mode loading of the crack-tip which results in crack kinking. This paper investigates the effect of crack bridges upon the effective mode-mixity and predicted kink angle of a crack in a graded material. An analytical model has been developed and applied to stepwise-graded alumina-polyester composite materials. It is found that Young's modulus, volume fraction and failure strain of the bridging phase, along with bridge diameter and delamination between phases, all noticably affect mode-mixity and crack kinking.
机译：在连接具有明显不同特性的材料时，可以通过合并组成渐变区域来最小化界面处的应力。由于组分相的破坏应变明显不同，在这些区域中传播的裂纹经常会出现裂纹桥接。另外，弹性特性的梯度可能导致裂纹尖端的混合模式载荷，从而导致裂纹扭结。本文研究了裂纹桥对梯度材料中裂纹的有效模式混合和预测的扭结角的影响。已开发出一种分析模型，并将其应用于逐步分级的氧化铝-聚酯复合材料。发现桥相的杨氏模量，体积分数和破坏应变，以及桥的直径和相之间的分层，都显着影响模态混合和开裂。

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