Fabrication defects are generally inevitable in particle-reinforced metal matrix composites (PRMMCs), however studies on their influence on the mechanical behaviors of PRMMCs are still far from sufficient. This paper presents a comprehensive investigation on the effect of internal fabrication defects (mainly voids and interface defect) on the mechanical properties of PRMMCs. The single-particle FE model and multi-particle FE model were established to comprehensively investigate the effect of voids and interface defect on PRMMCs. Simulation results show that the mechanical properties of composites are greatly influenced by various characteristics of voids and interface. In general, the detrimental effect of voids declines when voids are distributed far away from the particle. Moreover, when voids are located along the loading direction, they lower the mechanical performance the most. Additionally, composites with the most elongated voids show the lowest mechanical performance. Apart from these, the mechanical behaviors of composites can also be greatly impaired by the high dispersion of interface strength. This paper provides a guidance towards the evaluation and prediction of the mechanical properties of PRMMCs with internal fabrication defects.

在颗粒增强金属基复合材料（PRMMC）中，制造缺陷通常是不可避免的，但是对它们对PRMMC力学性能的影响的研究仍然远远不够。本文对内部制造缺陷（主要是空隙和界面缺陷）对PRMMC力学性能的影响进行了全面研究。建立了单颗粒有限元模型和多颗粒有限元模型，以全面研究孔洞和界面缺陷对PRMMC的影响。仿真结果表明，复合材料的力学性能受到空隙和界面各种特性的极大影响。通常，当空隙远离粒子分布时，空隙的有害作用会降低。而且，当沿加载方向定位空隙时，它们会最大程度地降低机械性能。另外，具有最大伸长空隙的复合材料表现出最低的机械性能。除此之外，界面强度的高度分散也会极大地损害复合材料的机械性能。本文为评估和预测具有内部制造缺陷的PRMMC的机械性能提供了指导。