纤维增强复合材料力学性能预测及试验验证

针对纤维均匀排布的单向纤维增强复合材料结构力学性能预测问题,基于复合材料细观力学有限元方法,研究建立了代表体积元(RVE)模型,并施加周期性边界条件,实现了纤维增强复合材料基本力学性能的预测。通过将应用上述RVE模型所获取的B/Al纤维增强复合材料力学性能预测结果与解析解和试验数据进行对比表明,施加周期性边界条件的RVE模型的力学性能预测结果与解析解和试验数据吻合良好,验证了所建立计算模型的有效性。基于单向连续纤维增强SiC/TC4复合材料板材的力学性能测试试验,获取了不同铺层方案结构的纵向/横向弹性模量和泊松比,得到的纵向/横向弹性模量计算值与各自试验值均值的误差均小于5%，表明弹性力学性能参数基本一致，计算模型具有合理性。 

Prediction and test verification of mechanical properties of fiber reinforced composites

For the problem of predicting mechanical properties of unidirectional fiber reinforced composite with uniform arranged fiber, based on the composite micro-mechanical finite element method, the representative volume element (RVE) model with periodic boundary conditions was researched and established, the basic mechanical properties were realized. By comparing simulation results of B/Al fiber reinforced composites which obtained by applying the RVE model with test results and analytical solutions, it showed that prediction of the mesoscopic mechanical model with periodic boundary conditions kept a preferable consistency with test results and analytical solutions, and the efficiency of the RVE model was proved. Based on the mechanical properties test of unidirectional fiber reinforced SiC/TC4 composite sheets, the longitudinal/transverse elastic modulus and Poissons ratio of different layup structures were obtained, and the error between the calculated longitudinal/transverse elastic modulus and the mean value of the respective test values was less than 5%, the comparison of structural mechanics properties predicted results showed that the parameters of elastic mechanics agree well and the calculation model was reasonable.