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

Using image processing, recognition technology and edge extraction technology, the real particle morphology and distribution of TiC/AZ91 composites are obtained, and a finite element numerical calculation model containing different particle shapes, different particle volume fractions and distributions is constructed. With the help of ABAQUS finite element software, the influence of different shapes, volume fractions and distributions of reinforcing particles on the stress distribution of TiC/AZ91 composites during the tensile process is studied, and the influence law and mechanism of the material failure behavior are discussed. The results show that: compared with circular particles, when the reinforcing particles are square, the failure area of the composite is the largest and the failure is the most serious; the larger the volume fraction of the reinforcing particles, the more likely the composite is to fail; the reinforcement effect of particle agglomeration is worse than that of uniform particle distribution, and there is a linear relationship between the ratio of the failure area of particle agglomeration to that of uniform particle distribution (y) and the tensile load (x): y = -0.041x + 6.54.

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。