Dynamic Performance of Different Metal Foam Magnetorheological Fluid Materials

Abstract

SThe paper mainly investigates the dynamic response of different metal foam MR fluid materials experimentally. Metal foam magnetorheological (MR) fluid materials can be used to manufacture the low-cost controllable damping devices with needless of seal and long service life. MR fluid is stored in metal foam by the capillary force mainly.In the action of magnetic field, MR fluid will be extracted out from metal foam and fill up the shear gap, and then, produce the MR effect. Three types of metal foams with different relative permeability, such as, Fe, Ni and Cu, are applied to store MR fluid. A set of testing system, including the plate-on-plate shear test rig, electromotor and force sensor, is built to investigate the dynamic performance of these materials. In order to describe the dynamic response accurately, three parameters of response time are introduced and defined. The magnetic field, both in the shear gap and the pore of metal foam, is simulated by the FEM software. The experimental results show that the response time of metal foam MR fluid materials will change with different currents, which provides the theoretical and experimental basis for the further development of metal foam MR fluid dampers or actuators. Index TermsDynamic performance, magnetorheological fluid, metal foam.

Magnetorheology: a review

“…They were discovered with the aim to improve the mechanical strength over that of MRF impregnated sponges. Liu et al 413 described the dynamic response of different metal foam MRF materials. They used three types of metal foams: Fe, Ni and Cu.…”

Controllable Damping Magnetorheological Elastomer Meniscus

“…Jin et al studied the compression properties of magnetorheological elastomers with added different types and quantities of iron powder, and the experimental results showed that the compression modulus could be increased by 12% to 15% by applying a 300 mT magnetic field during the compression test, and the mechanical properties of magnetorheological elastomers improved with the increase of the applied magnetic field. Our previous research results also proved its good effect in the field of human knee joint vibration reduction. − …”

A Novel Design Concept of a Magnetorheological Fluid-Based Damper Utilizing the Porous Medium for Implementation in Small-Scale Applications

“…It has been shown that in the presence of the magnetic field, the MR fluid is able to go out from the foam to make a contact with a surface that is placed not so far from the foam (up to 2 mm). Using this idea, an MR damper with a piston is proposed in [17][18][19], where the sponge is mounted at the housing wall over the circumference, and the electromagnet is attached to the moving piston. The principle sketch of this concept of MR damper is shown in Figure 1b.…”