摘要
基于连续介质损伤力学理论研究橡胶类材料疲劳寿命预测方法,用一阶Ogden应变能函数导出橡胶材料疲劳损伤演化方程,建立以等效应变范围为损伤参量的疲劳寿命预测模型。拟合橡胶材料无切口试样拉伸试验应力应变数据,获得橡胶超弹材料Ogden本构模型参数,通过有限元结构分析得出转臂橡胶球铰在疲劳载荷工况下的主应力分布。应用橡胶超弹材料等效应力计算法则与橡胶材料无切口拉伸试验应力应变数据,提出复杂应力状态下橡胶弹性减振元件等效应变范围计算方法,得出转臂橡胶球铰的等效应变范围。利用所建疲劳寿命模型对橡胶球铰进行寿命分析预测,并通过转臂橡胶球铰台架疲劳试验进行验证,结果显示试验疲劳寿命是预测疲劳寿命的1.96倍,预测精度比较理想。
Based on the continuum damage mechanics theory,rubber-like material fatigue life prediction method is researched.Using the first order Ogden strain energy function,a fatigue damage evolution equation of rubber material is derived and a fatigue life prediction model for rubber with equivalent strain range as damage parameter is built.Fitting tensile stress-strain data of unnotched specimen,Ogden hyperelastic constitutive model parameters of rubber materials are obtained.The principal stress distribution of an arm rubber bushing under fatigue loading is calculated by finite element structural analysis.Using equivalent stress method of rubber hyperelastic materials and the tensile stress-strain data of unnotched specimen,the equivalent strain range calculation method of rubber vibration damper under multiaxial stress state is put forward and the equivalent strain range of the arm rubber bushing is calculated.The model is used to predict the fatigue life of rubber bushing and verified by fatigue bench test result.The result shows that the predicted fatigue life is the fatigue test life of 1.96 times.So,the prediction accuracy is good.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2014年第10期80-86,共7页
Journal of Mechanical Engineering
基金
湖南省教育厅科研基金重点(08A014)
湖南省十二五机械工程重点学科(湘教发[2011]76号)资助项目
