Theoretical method for calculation of effective properties of composite materials with reconfigurable microstructure: electric and magnetic phenomena

Abstract

We propose a theoretical approach for calculating effective electric and magnetic properties of composites with field-dependent restructuring of the filler. The theory combines the Bruggeman-Landauer approximation extended to a field-dependent (variable) percolation threshold with the approximate treatment of nonlinearity of material properties. Theoretical results are compared with experiments on magnetorheological elastomers, which in the context of investigated phenomena are often called magnetoactive elastomers (MAEs). In MAEs with soft polymer matrices, the mutual arrangement of inclusions changes in an applied magnetic field. This reorganization of the microstructure leads to unconventionally large changes of electrical and magnetic properties. Obtained theoretical results describe observed phenomena in MAEs well. Qualitative agreement between theory and experiment is demonstrated for the magnetodielectric effect. In the case of magnetic permeability, quantitative agreement is achieved. The theoretical approach presented can be useful for development of field-controlled smart materials and design of smart structures on their basis, because the field dependence of physical properties can be predicted.

References in corpus (6)

• Tuned, driven, and active soft matter
• Effects of particle distribution on mechanical properties of magneto-sensitive elastomers in a homogeneous magnetic field
• High field magnetotransport in composite conductors: the effective medium approximation revisited
• Reversible magnetomechanical collapse: virtual touching and detachment of rigid inclusions in a soft elastic matrix
• Temperature-dependent magnetic properties of a magnetoactive elastomer: immobilization of the soft-magnetic filler
• Effect of single-particle magnetostriction on the shear modulus of compliant magnetoactive elastomers

Cited by in corpus (5)

• Critical bending and magnetic shape memory effect in magnetoactive elastomers
• Effect of Magnetic-Field-Induced Restructuring on the Elastic Properties of Magnetoactive Elastomers
• Interparticle Correlations in the Simple Cubic Lattice of Ferroparticles: Theory and Computer Simulations
• Magnetically induced deformation of isotropic magneto-active elastomers and its relation to the magnetorheological effect
• Effective medium theory for the thermoelectric properties of composite materials with various percolation thresholds