CFRP-TRB超混杂复合汽车B柱结构的优化设计

B柱是汽车的关键承载结构件之一。为了提高某轿车的侧面碰撞性能并实现B柱轻量化设计,结合汽车B柱的结构特点以及不同材料的特性,设计一种碳纤维增强复合材料(CFRP)-差厚钢板(TRB)复合B柱结构。将传统B柱中部加强板去除,B柱外板设计为差厚板的同时在其内侧局部铺贴碳纤维增强复合材料。基于Optistruct对该复合B柱内外板的厚度分布以及复合材料的铺层顺序及铺层厚度进行了优化设计。整车侧面碰撞模拟结果表明,在满足制造工艺要求的条件下,新型超混杂复合B柱结构达到了27.7%的轻量化效果,并同时提高了侧面碰撞的耐撞性。

Optimal design of the structure of CFRP-TRB supper-hybrid composite B pillar

The B pillar is one of the key load-bearing structural members of vehicles. To improve the side crash performances of a vehicle and realize the lightweight design of the B pillar, a hybrid structure of B pillar made from carbon fiber reinforced composite (CFRP)-tailor rolling steel blank (TRB) was adopted based on structural and different material characteristics of the B pillar. The traditional reinforcing plate in the middle of the B pillar was removed, and the B pillar outer plate was designed as a TRB steel plate with the CFRP partially attached to the inner side of the B pillar outer plate for reinforcement. In addition, the thickness distribution of the inner and outer plates of the hybrid structure B pillar and the layup order and layup thickness of the reinforced composite were optimized based on the software of Optistruct. Finally, the side crash simulation results of the whole vehicle show that the optimized hybrid-structure B pillar achieves a weight reduction of 27.7% and the resistance to side impact is improved.