动力总成橡胶悬置高温疲劳特性的预测与试验研究  

Fatigue life prediction and tests for rubber mounts under high temperature

作　　者：上官文斌[1,2] 李明敏[1] 段小成[1,2] 

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

出　　处：《振动与冲击》2015年第15期66-71,共6页Journal of Vibration and Shock

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)项目

摘　　要：选硬度为45度以及50度的天然填充橡胶(N45及N50)为研究对象,在常温(23℃)、60℃和90℃的环境中,对哑铃形橡胶试片进行单轴拉伸疲劳试验。以工程应变峰值ε为损伤参量,根据哑铃形试片的疲劳试验结果,建立了橡胶材料在三种不同温度环境下的疲劳寿命预测模型。分析了不同温度、高温软化、橡胶材料的硬度对橡胶疲劳寿命的影响。对一动力总成橡胶悬置进行了高温疲劳试验,利用建立的橡胶材料的疲劳寿命模型对其疲劳特性进行了预测,预测得到的寿命与实测寿命的相对误差小于10%,说明本文建立的填充天然橡胶高温疲劳寿命预测模型,可以用于高温环境下工作的橡胶悬置疲劳寿命的预测。Uniaxial tension fatigue tests were conducted for filled natural rubber specimens with two hardnesses including N45 and N50 under temperatures of 23℃,60℃ and 90℃. Based on the test data,the fatigue life prediction models were established by taking the maximum engineering strain as the damage parameter under three different temperatares. The influences of temperature,high temperature softening and hardness on the fatigue life of rubbers were investigated. A powertrain rubber mount was tested under 90℃ to obtain its fatigue life. A finite element model was established and the fatigue life of the rubber mount was estimated using the damage parameter calculated with the finite element model. The calculated fatigue life was compared with the measured one,and their relative error was less than10%. It was shown that the proposed fatigue life prediction models and the measurement method can be used to estimate the fatigue life of rubber mounts under high temperature.

关 键 词：填充天然橡胶材料 高温疲劳寿命 疲劳试验 寿命预测模型 试验验证 

分 类 号：U467.497[机械工程—车辆工程]