The fabrication and the identification of damping properties of magnetorheological composites for energy dissipation

The paper presents experimentally characterises properties of magnetorheological composites (MRC) in terms of their application as the energy dissipating materials. Composite specimens saturated with various contents of magnetorheological fluid, the matrix of which was polyurethane material, were prepared. The obtained composites were tested in conditions of cyclic shearing in order to determine the parameters of damping. A focus was on influence of the following parameters: a share of magnetorheological fluid in MRC, value of the magnetic field intensity H, as well as the magnitude gamma and frequency f of strain. The study results have been presented in the form of hysteresis loops in the tau(gamma) stress-strain system. As the quantity representing energy dissipated by the composites the Delta W area of those loops was assumed.