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基于随机分布短纤维与基体损伤的物理机制与统计描述 ,针对长径比、刚度模量与强度都比较大的脆性短纤维增强复合材料 ,提出了一种亚宏观材料模型 ;考虑了纤维与基体的损伤统计规律、损伤诱发的各向异性与损伤率等因素对材料宏观力学行为的影响 ,导出了亚宏观损伤本构方程 .还以短玻璃纤维增强聚丙烯复合材料为例 ,对损伤诱致各向异性与损伤率效应及初始取向分布对材料宏观力学性能的影响进行了定量分析 ;理论预测与文献中提供的实验结果良好吻合 .
Based on the physical mechanism and statistical description of stochastic distribution of short fibers and matrix, a macroscopic macromolecule material model is proposed for brittle short fiber reinforced composites with long and narrow diameter ratio, high stiffness modulus and strength. Considering the relationship between fiber and matrix The damage statistics law, the damage-induced anisotropy and the damage rate and other factors on the macroscopic mechanical behavior of the material, derived sub-macro damage constitutive equation. Short glass fiber reinforced polypropylene composite material is also taken as an example, The effect of anisotropy and damage rate and the initial orientation distribution on the macroscopic mechanical properties were quantitatively analyzed. The theoretical prediction is in good agreement with the experimental results provided in the literature.