填充橡胶材料单轴拉伸疲劳试验及疲劳寿命模型研究  

Experiment of Uniaxial Tension Fatigue and Modeling of Fatigue Life for Filled Natural Rubbers

作　　者：王小莉[1] 上官文斌[1,2] 刘泰凯[1] 李武成 徐驰 潘孝勇 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》2013年第14期65-73,共9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：对由汽车橡胶隔振器常用的橡胶材料制作的试件(哑铃形试片和哑铃形试柱),进行单轴拉伸疲劳试验。基于哑铃形试片的试验数据,分别以最大主应变量峰值、八面体切应变峰值和应变能密度峰值为损伤参量建立橡胶单轴疲劳寿命预测模型。结果表明,最大主应变量峰值、八面体切应变峰值和应变能密度峰值为损伤参量的寿命预测模型均能很好地以幂法则来建立损伤参量与疲劳寿命之间的关系,预测寿命与实测寿命的相关系数均达到0.9以上。其中以最大主Green-Lagrange应变峰值为损伤参量的寿命模型预测效果最佳,并以此最佳寿命模型预测哑铃形试柱的拉伸疲劳寿命。结果表明预测的哑铃形试柱拉伸疲劳寿命分布在实测寿命2倍分散因子之内,最大相对误差不超过28%。因此,为了节省试验成本和缩短试验周期,可用成本较低的哑铃形试片来代表哑铃形试柱进行橡胶材料的拉伸疲劳试验。A uniaxial tension fatigue test is carried out for two filled natural rubber specimens, dumbbell simple tension specimen （STS） and dumbbell cylinder specimen （DCS）. Based on the STS experimental data, the fatigue life prediction models using some commonly used damage parameters （maximum principal strain, octahedral shear strain and strain energy density） are established and used for estimating fatigue life. The comparison of estimated and measured fatigue lives for STS shows that all damage parameters discussed can be used to estimate tension fatigue life with correlation coefficient greater than 0.9, among which the model using maximum principal Green-Lagrange strain peak has the largest correlation coefficient with a value of 0.9966. Based on the model using maximum principal Green-Lagrange strain peak of STS, the fatigue life of a DCS is estimated. The estimated fatigue life of a DCS is compared with the measured data, which shows a good correlation. It is concluded that one can carry out only tension fatigue test using STS to model the tension fatigue of rubbers, with a lower cost and shorter test period.

关 键 词：橡胶隔振器 填充橡胶 损伤参量 疲劳寿命模型 疲劳试验 

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]