增强颗粒对金属基复合材料微观失效的影响

Effects of particle configuration on damage properties of metal matrix composites

借助图像处理和识别技术,建立复合材料真实微观结构的有限元模型,进而把该微观结构有限元模型嵌入到宏观模型中,并借助子模型分析技术研究SiCp/6061Al复合材料增强颗粒对其微观结构失效的影响。研究结果表明,和圆形颗粒相比,增强颗粒为正四边形时,SiCp/6061Al复合材料基体容易发生失效。颗粒团簇提高SiCp/6061Al复合材料刚度,但降低了SiCp/6061Al复合材料失效应变。当SiCp/6061Al复合材料达到失效状态,随着增强颗粒密度增加,SiCp/6061Al复合材料失效面积增大。

Using image processing and recognition,the microstructure-based finite element model(FEM) was established and embedded in a macro-model.In the meantime,the sub-model analysis technique was also used to analyze the effects of reinforced particle on the micro-failure of SiCp/6061 Al composites.The results show that when reinforced particles has square shapes,the matrix in SiCp/6061 Al composites is more prone to failure comparing with circle particles.Particle clusters can enhance the stiffness and reduce the failure strain of SiCp/6061 Al composites.When SiCp/6061 Al composites reach the critical failure,the failure area of SiCp/6061 Al composites can increase with increasing of particle volume fractions.