基于连续损伤模型空气弹簧疲劳寿命分析  

Fatigue Life Analysis of Air Springs Based on Continuum Damage Model

作　　者：丁智平[1] 李志超[1] 何园[2] 李雪冰[3] 黄达勇 

机构地区：[1]湖南工业大学机械工程学院,湖南株洲412007 [2]清华大学汽车安全与节能国家重点实验室,北京100084 [3]中车青岛四方车辆研究所有限公司,山东青岛266031

出　　处：《铁道学报》2016年第5期23-29,共7页Journal of the China Railway Society

基　　金：2013年中央财政支持地方高校发展专项资金(0420036017)

摘　　要：基于连续介质损伤力学理论,结合三阶Ogden应变能密度函数,推导出以等效应变范围为损伤参量的连续损伤寿命预测模型,并利用橡胶多轴疲劳试验数据拟合确定模型材料常数。通过等效应力计算公式和橡胶材料单轴拉伸实验数据拟合确定的应力-应变关系,得到空气弹簧胶囊在复杂应力状态下的等效应变范围。应用所建模型对空气弹簧进行疲劳寿命分析预测,并通过空气弹簧疲劳试验验证,结果显示实验疲劳寿命是预测疲劳寿命的2.02倍,满足工程疲劳寿命预测精度要求。Based on the continuum damage mechanics theory,and using the third order Ogden strain energy den-sity function,a continuum damage life prediction model with equivalent strain range as damage parameter was obtained.By fitting the data of the multiaxial rubber fatigue test,the material constants of the model were i-dentified.The equivalent stress formula and the data of uniaxial tensile test of the rubber materials were used to fit and determine the stress-strain relationship to obtain the equivalent strain range of air spring capsule un-der complex stress state.The model was used to predict the fatigue life of air springs and verified by fatigue ex-periments of air springs.The results showed that the experimental fatigue life was 2.02 times of the predicted fatigue life,meeting the requirement of engineering predictive precision for fatigue life.

关 键 词：橡胶 空气弹簧 等效应变范围 损伤模型 疲劳寿命 

分 类 号：TQ336.42[化学工程—橡胶工业] TH145.41[一般工业技术—材料科学与工程]