橡胶隔振器静态特性计算方法研究

Investigation on Calculation Method for the Static Characteristics of a Rubber Isolator

对橡胶试件进行了单轴拉伸、等双轴拉伸和平面拉伸试验,获得了试件在各种受力状态下的材料应力-应变关系曲线,应用最小二乘法拟合得到了不同橡胶超弹性本构模型的参数。利用这些模型参数,计算了某汽车动力总成橡胶隔振器X,Y和Z方向静刚度,并与试验结果进行了对比分析;利用不同应变状态下应力-应变数据拟合得到的模型参数,计算了橡胶隔振器的X,Y和Z方向静刚度。同时,还研究了Mullin效应和体积压缩变形对静刚度的影响。

Uniaxial extension,biaxial extension and planar extension tests were conducted to obtain the stress-strain curves of rubber specimens in three states.The parameters of various hyperelastic models for rubber were obtained by the least square method.The static stiffness in three directions of an automotive powertrain rubber isolator was calculated utilizing the obtained model parameters and compared with the measured.The static stiffness in three directions of the rubber isolator was calculated by using the constitutive model parameters,which were fitted by stress-strain curve in different strain levels.Influences of the Mullin effect and the bulk deformation on static stiffness prediction were investigated.