基于偶极模型的磁流变弹性体磁致压缩弹性模量机理

On Mechanism of Magnetic Field Induced Compressive Modulus of Magnetorheological Elastomers Based on Dipole Model

基于偶极模型分析了磁流变弹性体的磁致压缩弹性模量的机理。结果表明:当磁流变弹性体受到压缩变形时,其内部的颗粒链发生弯曲变形或在弯曲的同时被拉长;弯曲的颗粒链由于磁场产生的力矩作用使得压缩力增大;弯曲的同时被拉长的颗粒链在磁场的作用下会对基体材料产生挤压作用,而且在垂直于压缩方向限制了磁流变弹性体的变形,使得压缩力增大;磁流变弹性体的压缩弹性模量由于压缩力的增大而增大。

The mechanism of magnetic field induced compressive modulus of magnetorheological elastomers was analyzed by dipole model herein.The results show that particle chains are curved or curved and elongated simultaneously when magnetorheological elastomers are compressed.The compressive force of curved particle chains increases because of the moment on them induced by external magnetic field.When particle chains are curved and elongated,the matrix material is pressed by the chains at the presence of magnetic field,and the deformation of magnetorheological elastomers perpendicular to the direction of compression is constrained,so the compressive force increases.Therefore the compressive modulus of magnetorheological elastomers is enhanced by external magnetic field.