增强颗粒形状、体积分数及分布对原位自生TiC/AZ91复合材料失效行为的影响

Effect of shape, volume fraction and distribution of reinforced particles on failure behavior of in-situ TiC/AZ91 composites

采用图像处理、识别技术和边缘提取技术,获取TiC/AZ91复合材料真实的颗粒形貌和分布,构建了含有不同颗粒形状、不同颗粒体积分数及分布的有限元数值计算模型。借助ABAQUS有限元软件研究拉伸过程中增强颗粒不同形状、体积分数和分布对TiC/AZ91复合材料应力分布影响,探讨材料失效行为的影响规律及机制。结果表明:与圆形颗粒相比,增强颗粒为正方形时,复合材料失效面积最大,失效最为严重;增强颗粒体积分数越大,复合材料更容易产生失效;颗粒团聚比颗粒均布增强效果差,颗粒团聚与颗粒均布的失效面积比值(y)和拉伸载荷(x)之间呈线性关系:y=-0.041x+6.54。

The real particle morphology and distribution of TiC/AZ91 composites were obtained by image processing, recognition and edge extraction techniques, and a finite element numerical model with different particle shapes, different particle volume fraction and distribution was constructed. The effects of different shapes, volume fraction and distribution of reinforced particles on stress distribution of the TiC/AZ91 composites during tensile process were studied by means of ABAQUS finite element software, and the influence law and mechanism of failure behavior of the composites were discussed. The results show that compared with circular particles, the failure area of the composites is the largest and the failure is the most serious when the reinforced particles are square, the larger the volume fraction of the reinforced particles is, the easier the failure of the composites is. The reinforced effect of the particle clusters is worse than that of particle uniform distribution, and there is a linear relationship between the failure area ratio(y) of particle clusters and particle uniform distribution and tensile load(x):y=-0.041x+6.54.