汽车动力总成橡胶悬置的疲劳寿命实测与预测方法  

Methods for Measuring and Predicting Fatigue Life of Rubber Mounts of Vehicle Powertrain

作　　者：上官文斌[1,2] 刘泰凯[1] 王小莉[1] 李武成 潘孝勇 徐驰 俞斌[3] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510640 [2]宁波拓普集团股份有限公司,宁波315800 [3]泛亚汽车技术中心有限公司,上海201201

出　　处：《机械工程学报》2014年第12期126-132,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51275175);汽车仿真与控制国家重点实验室开放基金(20130103)资助项目

摘　　要：以某汽车动力总成橡胶悬置的寿命预测为研究目标,基于哑铃形橡胶试件的疲劳试验结果,分别以应变能密度、最大主Green-Lagrange应变、有效应力为损伤参量建立该橡胶材料的三种寿命预测模型。利用建立的三种疲劳寿命预测模型,对该汽车动力总成橡胶悬置疲劳寿命进行预测,并与实测结果进行对比分析。对比分析结果表明,以应变能密度为损伤参量的疲劳寿命预测模型和以最大主Green-Lagrange应变为损伤参量的疲劳寿命预测模型的预测效果相对较差,预测寿命落在实测寿命的4倍分散线之内;以有效应力为损伤参量的寿命预测模型预测的橡胶悬置的寿命落在实测寿命的2倍分散线之内。因此,以有效应力为损伤参量的寿命预测模型可较好地预测该动力总成橡胶悬置的疲劳寿命。A fatigue experiment is carried out for a rubber dumbbell cylindrical specimen and a rubber mount of vehicle powertrain.The dumbbell cylindrical specimen and the mount for vehicle powertrain are made of filled natural rubbers with the same formula.The calculation method for three damage parameters to estimate fatigue of rubbers is described and discussed.The damage parameters include strain energy density,maximum principal Green-Lagrange strain and effective stress.Based on the measured fatigue life data of dumbbell cylindrical specimen,three models using different damage parameters to predict rubber fatigue life is presented.The fatigue life of the mount predicted by the three models is estimated and is compared with the experimental fatigue life.The fatigue life calculated using the modes with strain energy density or maximum principal Green-Lagrange strain as the damage parameter is in a poor agreement with the experimental fatigue life within a factor of four.The model using effective stress as damage parameter can predict the fatigue life within a factor of two,which is the best prediction among the three models.It＇s concluded that the proposed model for fatigue life prediction with the effective stress can be used to estimate the fatigue life for a rubber mount of vehicle powertrain.

关 键 词：动力总成 橡胶悬置 疲劳寿命 疲劳试验测试 预测分析 

分 类 号：TQ333[化学工程—橡胶工业] TB39[一般工业技术—材料科学与工程]