硅橡胶基磁流变弹性体制备及动态剪切性能研究

Preparation and Dynamic Shearing Properties of Silicone Rubber Based Magnetorheological Materials

磁流变弹性体是一种新型的智能复合材料,其动态力学性能受磁场控制,可以应用于变刚度或避免共振的智能器件。在原有制备磁流变弹性体的基础上尝试采用不同的组份配比制备了以双组份室温硫化硅橡胶为基体的高性能磁流变弹性体。在0～700mT磁感应强度范围内,使用动态信号测试分析仪来测试分析所制样品的磁致动态频响函数。结果表明,在700mT磁感应强度下及羰基铁粉质量分数为75%时,所制备的磁流变弹性体的共振频率相对变化率可达到30%,具有较好的频率可控特性,同时,其动态剪切模量最大相对变化率可以达到67%,达到了磁场控制剪切模量的目的。

Magnetorheological elastomers（MRE） is a new type of smart materials. Its dynamic mechanical properties can be controlled by the magnetic field; and can be used in wide range of applications, such as the device in the need of variable stiffness or avoiding resonance： This article is in the base of the method MRE preparing, and prepared high-performance magnetorheolngical elastomers using two component RTV silicone rubbers as the matrix. In the range of 0mT to 700mT magnetic field, getting the magnetic dynamic frequency response function of samples in the use of the Test Dynamic Signal Analyzer. The results show that when magnetic induction at 700roT and carbonyl iron content of 75%, the sample＇s relative rate of change of resonant frequency can reach 30 %, characteristic frequency controllable is better. Relative rate of change of Dynamic shear modulus is 67%, Achieved the purpose that magnetic field controlling shear modulus.