连续碳纤维增强复合材料汽车顶盖铺层优化

Ply Optimization on Vehicle Roof of Continuous Carbon Fiber Reinforced Polymer

本文中基于抗雪压性能需求,对连续碳纤维增强复合材料汽车顶盖结构开展了多层次铺层优化设计。首先,进行了连续碳纤维增强复合材料力学性能试验和参数反求,并将分析所得应力应变曲线与试验结果对比,结果误差均在允许范围之内,验证了所选取的材料本构模型参数的正确性。然后,以顶盖质量最小化为目标,开展了汽车顶盖自由尺寸优化、尺寸优化和层组优化,在优化过程中同时兼顾了工艺约束和顶盖刚度两个方面的要求。优化后,连续碳纤维增强复合材料汽车顶盖的质量比原始钢制件减轻了59.3%,顶盖在加载过程中未出现明显的屈曲现象,满足设计要求。

In this paper, multi-layer ply optimization for the vehicle roof of continuous carbon fiber rein-forced polymer （ CFRP） is conducted based on the requirements of anti-snow performance. Firstly, material me-chanical properties test for CFRP and inverse identification of material parameters are performed, and the stress-strain curves obtained by numerical simulation are compared with test results with errors within allowed range, verif-ying the rightness of material constitutive model parameters defined. Then,with minimizing roof mass as objective,free-size optimization,size optimization and ply stacking optimization on CFRP vehicle roof are carried out with both process constraints and stiffness requirements concurrently considered. After optimization the mass of CFRP roof is 59. 3% lighter than that of original steel one,and no obvious bucking occurs during roof loading,meeting design re-quirements.