碳纤维复合材料汽车B柱加强板的优化与性能分析

通过建立B柱总成的有限元仿真模型,在等刚度原则下,对碳纤维复合材料B柱加强版进行自由尺寸优化、尺寸优化、铺层角度优化设计,并对B柱总成进行三点弯曲有限元仿真,获取优化后模型的最大位移及最大强度.通过真空导入成型工艺制作B柱加强板样件,并对碳纤维复合材料B柱总成进行三点弯曲试验,校核总成的强度指标.最后基于2018版C-NCAP标准分析整车侧面碰撞性能.通过对比刚度、弯曲性能、侧面碰撞侵入量、侧面碰撞侵入速度、侧面碰撞加速度,优化设计后的碳纤维复合材料B柱加强板可在保证刚度、强度及侧面碰撞性能的前提下替代原钢制B柱加强板,并使B柱加强板减重1.376 kg,减重比达到76.4%.

Optimization and Performance Analysis of CFRP Automotive B-pillar Reinforced Plate

This study starts from setting up the finite element simulation model of B-pillar assembly. Then, the size, free size and laminate orientation of carbon fiber composite B-pillar reinforced plate were optimized based on the principles of constant stiffness. Maximum strength and displacement of the assembly were obtained through Finite Element (FE) simulation of quasi-static three-point bending test on B-pillar assembly. B-pillar sample was fabricated by a Vacuum Infusion Process (VIP) and conducted on a three-point bending test to check the strength index of the B-pillar assembly. Finally, according to 2018 C-NCAP standards, side impact performance of vehicle was elaborated. The comparison results among stiffness, flexural property, side impact intrusion, intrusion velocity and acceleration indicate that the optimization design of CFRP can replace the original B-pillar steel reinforced plate under the premise of ensuring rigidity, strength and side impact performance. CFRP B-pillar reinforcement plate is 1.376kg lighter than that of the conventional one, and the weight loss ratio is up to 76.4%.