考虑缩径影响的橡胶衬套寿命仿真研究  

Life Simulation of Rubber Bush by Considering the Diameter Shrinkage Influence

作　　者：张志远 程稳正 陈海潮 徐京涛 余小巧 Zhang Zhiyuan;Cheng Wenzheng;Chen Haichao;Xu Jingtao;Yu Xiaoqiao(Geely Automobile Research Institute(Ningbo)Co.,Ltd.,Ningbo 315000)

机构地区：[1]吉利汽车研究院(宁波)有限公司,宁波315000

出　　处：《汽车技术》2024年第9期38-45,共8页Automobile Technology

基　　金：宁波市重点研发计划项目(20232ZDYF020091)。

摘　　要：为解决某车型前悬架下摆臂后衬套在路试中出现开裂的问题,提出一种考虑缩径工艺影响的寿命仿真方法。首先,通过仿真分析获得缩径后衬套的静刚度,结合多目标优化,得到可准确描述衬套力-位移特性的超弹性本构参数;然后,在考虑缩径预应变的基础上,采用裂纹扩展法预测衬套寿命,危险位置损伤达到2.01,并复现了路试开裂问题;最后,通过结构优化设计,将危险位置损伤降低至0.943。路试验证结果表明,优化后衬套的疲劳寿命得到有效提升,证明了所提出方案的有效性。To address the cracking issue of the rear rubber bushing in the front suspension lower control arm during road testing for a specific vehicle,a life simulation method considering the influence of the diameter shrinkage is proposed.Firstly,the static stiffness of the bushing after diameters shrinkage is simulated,and combined with multi-objective optimization,hyper elastic constitutive parameters that accurately describe the force-displacement characteristics of the bushing are obtained.Then,on the basis of considering pre-strain from diameter shrinkage,crack grow algorithm methods are employed to predict bushing life,achieving a damage level of 2.01 at critical location,which replicates the cracking problem observed in road tests.Finally,through structural optimization design,damage at hazardous locations is reduced to 0.943.The road test results show that the fatigue life of the optimized bushing can be improued effectively,and the proposed scheme is proved to be effective.

关 键 词：橡胶衬套 超弹性 多目标优化 裂纹扩展法 寿命仿真 缩径 

分 类 号：U463.3[机械工程—车辆工程]