Transient response of magnetorheological elastomers to step magnetic field

The time-dependent performance of magnetorheological elastomers (MREs) under a magnetic field is important for the precise control of smart devices based on MREs. Here, the transient responses of anisotropic magnetorheological elastomers, including magnetic field-induced storage modulus (Delta G') and loss modulus (Delta G ''), were investigated under different step magnetic fields. The results indicated that Delta G' increased over time while Delta G '' decreased after the initial jump in the loading stage of the step field. Delta G' quickly dropped to 0, while Delta G '' continued to decrease gradually in the removal stage of the step field. A comprehensive model based on magnetic dipolar and viscoelastic parameter models was proposed to explain the transient responses. Published by AIP Publishing.