扭转梁悬架碳纤维复合材料横梁结构优化

鉴于碳纤维增强复合材料(CFRP)轻质高强的特点,本文中将某乘用车扭转梁悬架原钢质横梁用碳纤维复合材料替代,并进行结构优化设计。首先,通过碳纤维增强复合材料层合板力学性能试验获得材料力学参数,建立悬架扭转梁有限元模型,并对扭转梁中的碳纤维复合材料横梁截面进行改进设计。在此基础上,综合考虑横梁质量、刚度和工艺约束,对CFRP横梁进行铺层厚度、角度和铺层顺序的多层次优化。优化后,在满足各项性能指标的情况下,碳纤维增强复合材料横梁比原钢质横梁轻量79.34%,取得显著的轻量化效果。

Structural Optimization of Carbon Fiber Reinforced Plastic Crossbeam in Twist Beam Suspension

In view of the features of lightweight and high-strength of carbon fiber reinforced plastic(CFRP),the original steel crossbeam of twist beam suspension is substituted with CFRP one,and the structural optimization design of CFRP crossbeam is carried out.Firstly,the material mechanical parameters are obtained through the mechanical properties test on CFRP laminates.The finite element model of suspension twist beam is established,and a modification of the cross section of CFRP crossbeam is proposed.On this basis,with concurrent consideration of the mass,stiffness and process constraints of crossbeam,a multi-stage optimization is conducted on the thickness,orientation angle and laying sequence of the plies of CFRP crossbeam.After optimization,compared with the original steel crossbeam,the CFRP crossbeam gets a mass reduction of 79.34%,achieving a remarkable effect in mass reduction while meeting the requirements of performance indicators.