Dynamic magneto-viscoelastic model for magnetorheological nanocomposites with imperfect interface

Xiangrong Chen,Lz Sun,Rui Li

doi:10.1177/1056789518823877

Abstract

A dynamic magneto-viscoelastic interface model is proposed to study the effective magneto-mechanical responses of magnetorheological nanocomposites filled with carbon nanotubes. It is incorporated with the fundamental micromechanics principles, microstructural magnetic and mechanical coupling, and computational homogenization procedures. The field-dependent effective dynamic stiffness and damping of randomly dispersed, chain-structured nanocomposites are investigated with the consideration of imperfect interfacial conditions among nanofillers, micro-particles and the matrix. Comparisons are performed between the model prediction and experimental data for a specific type of Fe particle-reinforced elastomer nanocomposites filled with multi-walled carbon nanotubes to demonstrate the capability of the proposed model framework.

Highlights

Magnetorheological elastomers (MREs) are adaptive elastomeric composites reinforced with ferromagnetic micro-particles
A micromechanics-based dynamic magneto-viscoelastic interface model is developed to investigate the effective magneto-mechanical responses of MR nanocomposites filled with carbon nanotubes (CNTs)
Both the zero-field dynamic viscoelastic behavior and the corresponding MR effect have been taken into account

Summary

Introduction

Magnetorheological elastomers (MREs) are adaptive elastomeric composites reinforced with ferromagnetic micro-particles. The addition of magnetizable particles allows magnetic fields to rapidly and continuously control the effective mechanical performance of the composites. Such tunable magnetorheological (MR) composites promise more functionality than conventional composites and can provide a bridge among modern control technologies, intelligent structures, and robotics (Carlson and Jolly, 2000; Kim et al, 2018; Li et al, 2014; Lopez-Lopez et al, 2016; Elhajjar et al, 2018). The ferrous particles are induced by the magnetic field to form chain-like structures, which are embedded in the solidified rubber matrix. When such MR composites are exposed to an applied magnetic field, their bulk mechanical properties can be tailored by the magnetic field due to inter-particle magnetic interactions

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Methods

Conclusion