(510ax) Compressible Magnetorheological Fluids

Compressible Magnetorheological Fluid (CMRF) is a modification of typical Magnetorheological (MR) fluid. It is modified by adding compressible particles and provides an elastic component to MR fluids which can be used with a spring less damper. In the absence of an applied magnetic field, CMRF behaves like Newtonian fluids. When subjected to a magnetic field it exhibits completely reversible rheological property change. The magnetic field induces the particles of the CMRF to form chain like structures, and the fluid behaves as a Bingham plastic. CRMF consists of a carrier fluid such as silicone oil or polyalphaolefin which has a suitable compressibility factor. Magnetorheological materials are comprised of magnetizable particles, usually carbonyl iron or other magnetizable alloys of iron, nickel and cobalt. These particles are micron sized, and are dispersed in a liquid carrier fluid. To make the magnetorheological fluid compressible micron size compressible polymer particles or microcellular closed cell flexible foam particles are added to the MR fluid along with the suspended magnetizable particles. To improve the stability of the particles, CMR fluid also contains stabilizer suspensions, as well as various surfactants and other additives. This will improve the performance of the CMRF as a working fluid for various devices.