关键词: 复合材料, 金属基复合材料, 短纤维, 弹性模量, 临界长径比

Abstract: Based on the theoretical model for the elastic modulus of short fiberreinforced composite, the critical elastic modulus of short fiberreinforced metal matrix composites was proposed and an analytical expression for the relationship between the critical elastic modulus and the critical aspect ratio of the fiber and other material parameters was derived. The critical aspect ratio of the fiber is defined as the crosspoint of the tangent value of the inflexion and the asymptote of the maximum elastic modulus. The calculations reveale that the critical aspect ratio of the fiber increased with increasing the elastic modulus of the fiber and decreased with increasing the elastic modulus of the matrix and the volume fraction of the fiber.

Key words: composite material, metal matrix composites, short fiber, elastic modulus, critical aspect ratio