中文摘要：

研究了理想界面短纤维的不同长径比对脆性基复合材料在单轴拉伸荷载下力学性能的影响．从细观尺度上考虑基体材料介质的非均匀性，对复合材料的变形、损伤直至失稳破坏的全过程进行数值模拟、结果表明：随着增强短纤维长径比的增加，复合材料的强度、韧性以及刚度都随之增加，同时材料试件的失稳破坏模式也受到长径比的影响而有所不同.

英文摘要：

The effect of fiber aspect ratio on the mechanical behavior of composite is studied under uniaxial tensile load. Heterogeneity is applied to each mechanical parameter in mesoscale. Then, RFPA^2D, a numerical program developed on meso-damage mechanics, is adopted to simulate the whole failure process. The simulation result shows that higher fiber aspect brings higher strength, toughness and elasticity for the short fiber reinforced composite. Furthermore, the mechanism of the composite is also distinct with different aspect ratios.