Isotropic magnetorheological elastomers with thermoplastic matrices: structure, damping properties and testing

Abstract

This paper presents a procedure for manufacturing composites, a methodology for testing them and the cyclic properties of isotropic magnetorheological elastomers. The choice of a thermoplastic matrix and magnetically active iron powder as the filling (much larger than the carbonyl iron powder filling used so far) is expounded. A manufacturing technology has been developed. Possibilities for the experimental investigation of magnetomechanical properties have been created by building a measuring system enabling the testing of various elastomers in a wide range of mechanical and magnetic parameters. The effect of the magnetic field and that of the stress frequency on the damping properties of a selected elastomer (considered to be optimal) were examined.

Magnetic field intensity effect on plane electric capacitor characteristics and viscoelasticity of magnetorheological elastomer

“…MR elastomers can be produced either in the absence or in the presence of the magnetic field. Without magnetic field, an isotropic MR elastomer is produced [17][18][19], while anisotropic MR elastomers are produced in the presence of the magnetic field [20][21][22][23]. These two types of MR elastomers are different from the formation of microparticle chains along the magnetic field lines.…”

Mechanics of magneto-active polymers

“…Zhao et al, 2011), natural and synthetic rubber (Carlson and Jolly, 2000), silicon elastomers (Zhou et al, 2003), polyurethanes (e.g. Carlson and Jolly, 2000;Wu et al, 2010) and thermoplastic polymer (Zajac et al, 2010). Typical magnetic particles used as the filler of MAPs are soft magnetic materials, such as iron particles in micron size (e.g.…”

“…(3.7) should be valid. It should be mentioned that some experiments are done under approximately constant true magnetic induction by placing the sample between two permanent magnets, such as those measuring the MR effect in shear (Jolly et al, 1996;Varga et al, 2006;Kaleta and Lewandowski, 2007;Stepanov et al, 2007;Chen et al, 2007;Zajac et al, 2010). The measured constant-induction moduli, e.g.…”

“…While various polymers can been employed as the matrix material, silicon rubber and polyurethane are often used (e.g. Carlson and Jolly, 2000;Varga et al, 2006;Zajac et al, 2010;Wu et al, 2010). Due to their reliability and ease of manufacturing, micron-sized iron particles are usually used as the filler (e.g.…”

Physicochemical Properties and Stress-Strain Compression Behaviors of a Waste based Magnetorheological Elastomers

“…(2), can be recognized as the fraction of the di erence between on-state and o -state respond parameters to the o -state respond parameter [38]. In practice, the parameters can be forces [56], normal stress [75], sti ness [76], shear stress, and dissipation energy [77]. In this study, the MR e ect in static and dynamic testing conditions can be determined through both static and dynamic compressive stresses.…”