多尺度联合仿真在复合材料注塑成型中的应用

Application of Multi-Scale Co-Simulation in Injection Molding of Composite

纤维增强材料的微观取向及分布结果是影响复合材料注塑制品宏观力学性能的关键因素。然而,结合复合材料注塑制品结构性能的传统模拟分析结果,由于没有分析由注射成型加工所引起的纤维微观取向及分布结果,其分析结果难以为产品结构优化和性能评价提供准确指导。以玻纤增强复合材料注塑成型汽车电子油门踏板为研究对象,采用基于模流分析软件Moldflow、复合材料建模平台Digimat以及结构分析软件Abaqus的多尺度联合仿真技术进行结构性能分析。结果表明,微观层面的纤维取向与分布对制品的宏观性能具有显著影响,在中间肋板与踏板连杆杆体的交汇处增加过渡圆角,能够有效地改善纤维的取向与分布,从而减少应力集中现象。

The micro-orientation and distribution of fiber-reinforced materials were the key factors that determined the macro-mechanical properties of injection-molded composite parts. However,since the micro-orientation and distribution results of the fibers caused by the injection molding process were not taken into consideration,the traditional simulation analysis results of mechanical properties of the injection-molded composite parts were difficult to provide accurate guidance for structure optimization and performance evaluation. A multi-scale co-simulation technology based on Moldflow,Digimat and Abaqus was used to analyze the structure and performance of automotive electronic throttle pedal which was injection molded with glass fiber reinforced composite. The results showed that the macroscopic properties of the product were significantly affected by the orientation and distribution of the fibers at the microscopic level,and the orientation and distribution of the fiber were effectively improved. The stress concentration was released by increasing the transition angle at the intersection of the intermediate ribs and connecting rod.