Magnetorheological effect in elastomers containing uniaxial ferromagnetic particles

TL;DR

This paper investigates the magnetorheological effect in elastomers with uniaxial ferromagnetic particles, revealing large shear deformations and phase transition behavior induced by magnetic fields.

Contribution

It introduces a theoretical framework for the collective magnetorheological effect in magnetoactive elastomers with uniaxial ferromagnetic particles, highlighting conditions for large shear and phase transitions.

Findings

Magnetically-induced shear can reach tens of percent even at low particle concentrations.

Deformation can undergo a second-order phase transition when magnetic field aligns with particle easy axis.

Theoretical description based on force momenta consistency explains observed effects.

Abstract

The description of the collective magnetorheological effect induced by magnetic field in magnetoactive elastomers is proposed. The condition of consistency is used between magnetic and mechanic momenta of forces exerted on magnetically uniaxial ferromagnetic particles in elastomer at their magnetization. The study shows that even in the case of small concentration of particles, the value of magnetically-induced shear can be anomalously large, reaching up to tens of percent. The deformation of magnetoactive elastomer can evolve critically, as a second-order phase transition, if magnetic field is aligned along the easy axis of particles.