AUTHOR=Zhang Yunfei , Fang Fengzhou , Huang Wen , Chen Yuchuan , Qi Song , Yu Miao TITLE=Dynamic Mechanical Hysteresis of Magnetorheological Elastomers Subjected to the Cyclic Loading and Periodic Magnetic Field JOURNAL=Frontiers in Materials VOLUME=6 YEAR=2019 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2019.00292 DOI=10.3389/fmats.2019.00292 ISSN=2296-8016 ABSTRACT=

Magnetorheological elastomer (MRE) is one of the most promising smart materials with excellent magnetic-control mechanical properties. This work focuses on the study of the dynamic mechanical properties of MRE under cyclic loadings and periodic magnetic field. The influences of matrix, particle distribution, magnetic field on the dynamic mechanical hysteresis are systematically investigated. It is found that all the normal force, magnetic fields and shear strain would cause a hysteresis in the dynamic mechanical responses of MRE. The continuous cycle tests reveal the hysteresis tended to be saturated after several initial cycles. The hysteresis of MRE under the constant magnetic field can be attributed to the rearrangement of particles, which causes a hardening effect of MRE under the continuous dynamic tests. The periodic magnetic field causes a hysteresis in the dynamic modulus which could be attributed to the irreversible movement of the particles. Among them, the polymer matrix of MRE plays an important role in the dynamic mechanical hysteresis, which suggests more stable molecular chain structures in the matrix reducing the magnitude of hysteresis and improving its stability. Besides, the saturation of the mechanical hysteresis had also been studied, and then relevant physical mechanism was proposed for the qualitative explanation.