基于Mori?Tanaka方法的短纤维复合材料开孔板分析

基于Mori?Tanaka均匀化方法，对短纤维复合材料开孔板力学性能进行研究。首先，使用Mori?Tanaka方法预测单向和二维2种分布形式的短纤维复合材料应力?应变曲线曲线。其次，通过试验方法分析不同区域纤维取向对开孔板力学性能的影响。最后，使用多尺度方法研究不同注塑位置和不同开孔方式对开孔板力学性能的影响，该部分在宏观有限元分析中耦合了注塑模拟的纤维方向分布以及Mori?Tanaka均匀化方法得到的复合材料参数。结果表明，短边注塑开孔板综合力学性能更好；孔周围纤维分布是影响应力集中的主要因素；整体的纤维取向分布影响开孔板的刚度；单向纤维材料的角度对材料性能的影响不是单调的。

Analysis of Opening Plate Injection?Molded by Short?Fiber?Reinforced Thermoplastic Composites Based on Mori?Tanaka Method

This paper reported an investigation on the mechanical properties of opening plate injection?molded by short?fiber?reinforced thermoplastic composites by means of the Mori?Tanaka homogenization method. The Mori?Tanaka method was adopted to predict the stress?strain curves of the composites in both unidirectional and two?dimensional distributions, and then the effect of fiber orientation on the mechanical properties of the opening plate were analyzed by experimental methods. Finally, a multi?scale method was used to study the effects of different injection positions and different opening methods on the mechanical properties of the opening plate. This study was coupled with the fiber direction distribution of the injection molding simulation and the material parameters obtained by the Mori?Tanaka homogenization method in the macroscopic finite element analysis. The results indicated that the opening plate molded by short?side injection exhibited better comprehensive mechanical properties, and the fiber distribution around the hole was the main factor affecting the stress concentration. The overall fiber orientation distribution influenced the stiffness of the opening plate, and however there is a complicated influence from the angle of unidirectional fiber?reinforced composites on the material properties.