Study on mechanical properties of a novel polyurethane sponge magnetorheological elastomers in compressive mode

A kind of magnetorheological elastomer based on polyurethane sponge silicone rubber was prepared. Based on the representative volume element method of mesomechanics, COMSOL is used to numerically simulate the compression mechanical behavior of the new elastomer. The results show that the magnetorheological elastomer of polyurethane sponges has better magneto-strictive modulus than that of ordinary magnetorheological elastomers. Compressive mechanical properties of polyurethane sponge magnetorheological elastomer and common magnetorheological elastomer were tested by Instron8801 servo hydraulic fatigue testing machine, and the compressive stress-strain of two elastomers under different loading frequencies and different magnetic field strengths was obtained. Finally, combining the phenomenological theory with the microphysical model, a parametric constitutive model in compression mode considering the magnetic dipole interaction of the material, the viscoelastic properties of the matrix material and the strain hardening phenomenon of the rubber material is proposed. And then the accuracy of the constitutive model is verified by comparison with relevant experimental results.