磁敏橡胶材料弹性模量的测试与研究

研究了磁敏橡胶超声测试的基本方法和参数，测量了各向同性和颗粒成链磁敏橡胶材料的纵向模量。对含铁颗粒填料体积分数不同的磁敏橡胶样本进行了三点弯曲试验，计算出磁敏橡胶样本的弹性模量，并与相关理论预测模型进行了对比，结果表明，对于各向同性磁敏橡胶，随着含铁颗粒填料体积分数的增加，其弹性模量和剪切模量增大。颗粒成链磁敏橡胶的弹性模量很大程度上依赖于测量的方向，含铁颗粒填料体积分数超过15 ％时，在平行和垂直于颗粒链方向所测得的弹性模量有显著的不同。这是因为含铁颗粒填料体积分数超过15 ％时，磁敏橡胶的颗粒成链结构不具有立体对称性。

Research of Test of Elastic Modulus of Magnetorheological Rubber

With the change of volume fraction of the iron particle and magnetic field strength, the characteristics of the elasticity for the isotropic and the aligned silicone rubber-based magnetorheological rubbers were investigated. Using ultrasonic testing methods, the longitudinal modulus of the isotropic and the aligned magnetorheological rubbers were measured. The magnetorheological rubber samples with the different volume fraction of the iron particle were tested using a three-point bending test. The results from experiment were compared with the relevant theoretical prediction model. The elastic modulus and shear modulus increases linearly with the increasing volume fraction of the filler. The moduli of parallel are significantly different from perpendicular if the filler volume fraction exceeds 15%. The chain structure of rubber does not have a cubical symmetry when the iron particles filler volume fraction more than 15%.