非均匀性对纤维增强复合材料力学性能的影响

Numerical Simulation on Influence of Heterogeneity on Mechanical Behavior of Composites Reinforced with Fibers

研究了材料介质细观非均匀性对纤维增强脆性基复合材料在单轴拉伸荷载下的力学性能的影响。结果表明,材料介质越均匀,复合材料的弹性模量就越接近理论值,其峰值强度也越大。同时,复合材料的非线性行为降低,破坏前的预兆现象减少,并得到相应的声发射结果。

The influence of heterogeneity on mechanical behavior of composites reinforced with fibers was researched by using the different homogeneity indexes. The simulation results showed that the fiber reinforcement with higher homogeneity index （which represented that the material was more uniform） could bring out not only higher elastic modulus, but also higher strength. In addition, less nonlinear behavior of the failure process and less portent before the fracture can be observed. Furthermore, the figures of acoustic emission were also presented.