Dynamic Mechanical Hysteresis of Magnetorheological Elastomers Subjected to the Cyclic Loading and Periodic Magnetic Field

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.

Magnetorheological Elastomers: Fabrication, Characteristics, and Applications

“…For the synthesis of PU elastomers, diisocyanate such as aromatic or aliphatic, macrodiol such as polymeric diol, and small molecule diol or diamine as chain extenders are used to form a copolymer. Macrodiol sequence is a soft-segment and diisocyanate and chain extender sequence are a hard-segment to have the character of elastomer [ 75 , 76 , 77 , 78 ]. In order to provide mechanical properties such as the elastomer of the PU, the soft segment generally has a glass transition temperature substantially lower than the desired service temperature, and the hard segment has a glass transition temperature or melting temperature much higher than the desired service temperature.…”

Novel high efficiency deterministic polishing method using magnetorheological elastomer

“…It therefore has been successfully applied in the fields of noise reduction [17], vibration attenuation [18,19], soft robots [20], smart sensing [21], electromagnetic shielding [22], etc. The MR effect computed by the ratio of the magnetic-induced modulus to the initial modulus is the most significant feature of MREs, which essentially is the strengthened magnitude of dynamic mechanical behaviors of the material [23]. The MR effect of MREs is just like that of magnetic-induced Bingham fluid ribbon in MRF.…”

Installation and technology for the synthesis of magnetorheological polyurethane elastomer

“…The MRE manufacturing process involves three steps: mixing, curing, and aligning the magnetic particles under an external magnetic field. *acidwolfvx@rambler.ru The characteristics of the synthesized material are influenced by both the composition of the polymer matrix used (silicone rubber, natural rubber, polyurethane elastomer and others), and the conditions of synthesis and stabilization of particles in a magnetic field [13][14][15]. The paper describes the technology for the synthesis of MREs based on polyurethanes and an installation for aligning magnetic particles.…”