Research On The Mechanical Propertie Of Magnetorheological Elastomers

Magnetorheological elastomer,as a kind of magnetic sensitive intelligent material,has the advantages of adjustable self-performance and process controllability,which provides possibility for real-time intelligent control of sheet forming process.In this paper,two-dimensional and three-dimensional MREs RVE models are established for silicone rubber-based or polyurethane-based magnetorheological elastomer media from the viewpoint of micromechanics.Based on the combination of theoretical analysis and numerical simulation,the macro-static properties and magnetic properties of MREs are studied,and the mechanism of mechanical properties change is analyzed in combination with magnetic properties.The results show that the tensile stress of 2D isotropic MREs increases and the tensile modulus decreases under the application of external magnetic field.The compressive stress decreases and the compressive modulus increases.However,the shear stress decreases and the shear modulus decreases first and then increases.The tensile stress of MREs with two-dimensional and three-dimensional uniform particle chains increases and the tensile modulus decreases under the application of external magnetic field.The compressive stress decreases and the compressive modulus increases.The shear stress and shear modulus increase.The non-uniform distribution of particles in the three-dimensional particle chain MREs can keep the change rule of mechanical properties unchanged,while the mechanical properties such as magnetic stretching,compression,shear modulus and magnetic properties such as magnetic force and magnetic energy are improved.The change of mechanical properties under external magnetic field is the result of phase transformation between magnetic energy and strain energy of matrix prestored in matrix.Firstly,on the basis of the dipole model,the magnetic properties and magnetic properties of the magnetic stretching,compression and shear modulus of the grain chain MREs are theoretically studied based on the homogenization method,and the calculation formulas of the magnetic stretching,compression and shear modulus are obtained.At the same time,the calculation formula of magnetic energy in MREs is provided.A two-dimensional RVE model of magnetorheological elastomer is established.Considering the nonlinearity of matrix constitution and the linear magnetization of particles,the magnetoelastic coupling numerical simulation of magnetic deformation of MREs is carried out through the use of multi-physical field coupling software,including tensile,compressive and shear deformation,and its magnetocommitted and magnetic properties are studied.The RVE model of three-dimensional magnetorheological elastomer with uniform and non-uniform particle chains is established,and the magnetic deformation of MREs is simulated by magneto-elastic coupling numerical simulation of stretching,compression and shearing.Finally,the changes of magnetic modulus,magnetic energy and magnetic field force of MREs with magnetic field strength and strain under the action of tension,compression and shear are obtained.