车用结构胶在白车身轻量化设计中的应用

Application of vehicle structural adhesive in lightweight design of car body-in-white

从传统白车身(BIW)连接技术的局限性出发,通过增加白车身特定部位的结构胶,结合有限元(FEM)及灵敏度分析法,对某型乘用车白车身进行了轻量化应用研究。首先,建立白车身的有限元模型;其次,基于拓扑优化和工艺约束,确定结构胶涂抹的位置;然后,以白车身弯扭刚度和一阶弯扭模态性能作为约束,以白车身质量最小为目标函数,以白车身钣金件的料厚为变量,建立了基于灵敏度分析法的白车身轻量化设计模型。研究结果表明:采用有限元分析法,在白车身轻量化设计中,白车身可减重15.68 kg,弯扭刚度和弯扭模态性能有所提升。

Considering the limitations of traditional body-in-white(BIW)connection technology,the lightweight application of BIW in a certain type of passenger car was studied by adding structural adhesive to specific parts of BIW,combining with finite element method(FEM)and sensitivity analysis method.Firstly,the finite element model of BIW was established,and secondly,the coating position of structural adhesive was determined based on topology optimization and process constraints.Then,taking the bending-torsion stiffness and first-order bending-torsion modal performance as constraints,taking the minimum mass of BIW as objective function,and taking the material thickness of BIW sheet metal parts as variables,the lightweight design model of BIW was established based on sensitivity analysis method.The research results showed that the weight of BIW could be reduced by 15.68 kg by using FEM in the lightweight design of BIW,and the bending-torsion stiffness and bending-torsion modal performance were improved to a certain extent.