减震胶粘接结构烘烤变形机理的仿真分析

摘要

针对汽车车身中的减震胶粘接结构在烘烤固化后出现凹陷变形的问题,在试验研究的基础上,开展了有限元仿真模拟研究.通过选取合理的仿真材料模型,实现了汽车常用减震胶粘剂的同化特性、膨胀特性及粘弹性特性的仿真再现.在此基础上,建立了粘接结构有限元模型,并通过简单样件试验及模拟对模型进行了调试和验证将模型用于轿车车顶结构的模拟分析,成功预测了车顶结构在烘烤同化后的变形行为.%Finite element simulations were conducted,in addition to experimental studies,to investigate the curing depression deformation observed after curing in damping adhesive structures on vehicle body.Curing characteristics,expansion behaviors and viscoelasticity properties of commonly used damping adhesive were modeled by properly selection of constitutive models.Simplified finite element models of damping adhesive structures were then set up,debugged and validated with sample piece test and simulation.Finally,the developed model was applied to the simulation of roof structure,and the deformation after curing was predicted successfully.