纤维增强复合材料的力学性能预测的数值模拟

纤维增强复合材料的力学性能和热物理性能依赖于纤维的取向状态.在注射成型过程中纤维最终的取向状态依赖于充填过程的速度场,因此最终的产品性质依赖于成型的详细过程.研究发现,注塑成型制品的结构呈层状分布,层数依赖于模具几何和成型条件,不过大多数的结构在成型表面为沿流动方向取向,而在中心层为横向排列,有时在制件表面还有一层薄的介于二者之间排列的取向层.本文主要给出两个简单模型中纤维取向预测的理论和数值方法,这两个模型分别为:中心浇口圆盘和边浇口长条.

NUMERICAL SIMULATION AND PREDICTION OF MECHANICAL PROPERTIES OF FIBER REINFORCED COMPOSITES

The mechanical and thermal physic properties depend strongly on the fiber orientation state during injection molding process. The final orientation of the fiber depends on the velocity field during mold filling .So the properties of the finished part depend on the details of the molding process. According to the result of the research, the structure of inection moldings has been found to be layered. The mumber of layers appears to depend on the mold geometry and processing condition. But most structures show flowed-aligned shell layers near the surface of the molding with a transversely aligned core layer at the midplane. Sometimes, a thin skin layer at the outer surfaces has an orientation in between that of core and shell layers.In this paper, we set out the theory and numerical methods to predict fiber orientation appling to two simple patterns. The patterns are a film gated strip and a center gated disk.