LORD Magneto-Rheological (MR) Fluids
LORD Magneto-Rheological (MR) fluids are suspensions of micron-sized, magnetizable particles in a carrier fluid. Normally, LORD MR fluids are free-flowing liquids having a consistency similar to that of motor oil. However, when a magnetic field is applied, their rheology changes, virtually instantly, to a consistency similar to peanut butter. LORD MR fluids have been used in a variety of applications.
Altering the strength of an applied magnetic field precisely and proportionally controls the consistency or yield strength of these fluids, which behave as Bingham plastics when in the presence of a magnetic field.
LORD MR fluids can be used in valve mode, with fluid flowing through an orifice (as in a shock absorber) or in shear mode (for a brake or clutch) with the fluid flowing between two surfaces that move relative to each other. In the absence of a magnetic field applied across the gap the fluid occupies, the fluid flows freely or allows free movement. Upon application of a magnetic field, the particles align along the flux path generated by the magnetic field. The formation of these particle chains restricts the movement of the fluid within the gap since the fluid’s yield strength is increased. Altering the inter-particle attraction by increasing or decreasing the strength of the field permits continuous control of the fluid’s rheological properties and hence the damping or clutch or braking force.
Our patented MR fluids exhibit fast response time, high dynamic yield stress, low plastic viscosity, broad operational temperature range, resistance to settling, easy remixing, and excellent wear and abrasion resistance. Many people ask us about the life of LORD MR Fluid. Our FAQs provides additional information about our fluid;s characteristics.
Learn more about a specific LORD MR fluid, with our technical data sheets:
To learn about material selection, please download the MR Fluid Selector Guide.