考虑界面时细观几何结构对复合材料力学性能的影响

基于应力为未知量的通用单胞模型改进算法在保证计算精度的前提下,可以提高计算效率,本文利用该方法计算了考虑界面时细观结构对纤维增强复合材料力学性能的影响.计算结果表明,当界面结合较差时,必须考虑界面性能对复合材料的影响;当界面模量接近或等于基体的模量时,已满足界面结合完好的条件,因此可不考虑界面对复合材料的影响;界面对复合材料的弹性模量、泊松比以及应力-应变曲线的影响较大,因此,界面是复合材料力学性能预测中不可忽略的重要环节.同时,纤维截面形状及排列方式对复合材料宏观的力学性能影响较大.

Influence of Micro-structural Geometry and Interface on Composite's Mechanical Behavior

An efficient implementation of GMC model was used to investigate mechanical behavior of fiber reinforced metal matrix composites considering interfacial effects in this paper. The efficient implementation, which can be used to analyze repeating unit cells containing thousands of subcells, is more efficient than original formulation of GMC. The results indicate that the interface must be considered when interfacial modulus is lower. The interfacial performance will influence the modulus, poisson's ratio and stress-strain curve of composites. The interface is key factor in composite's mechanical behavior. The influence of fiber shape and packing arrangement are obvious for mechanical properties of composites.