Smart_Materials71


 * ** Current industrial applications : **

1- ** Heavy Duty Vehicle Seat Suspensions ** Recently a small, monotube MR fluid-based damper has been commercialized for use in a semi-active seat suspension system for large on- and off-highway vehicles (Carlson, Catanzarite and St.Clair, 1995; Lord, 1997). In this application the MR damper represents enabling technology for a variety of semi-active control schemes. This damper has also served as a testbed for developing phenomenological device models (Spencer, et al., 1996; Pang et al., 1998).
 * 2- “Seal-Less” Vibration Damper **

A small, controllable MR fluid vibration damper that is being used for real-time, active-control of-damping in industrial applications is s (Carlson, Catanzarite and St.Clair, 1995). The damper functions by moving a small steel disk or baffle in a chamber of MR fluid. Primary controlled motion is axial although secondary lateral and flexing motions may also be accommodated. Damping forces of 0 to ± 125 N are produced in the primary direction. This damper may be alsoe used as a locking device. This damper does not require dynamic, sliding seals. The relatively small amplitudes encountered (± 3 mm) allow the use of elastomeric rubber elements instead. Typically these dampers are used as controllable dash-pots in parallel with separate spring elements. Stiffness may also be added to the elastomeric elements so that the damper functions as a controllable mount.



3 - Human prosthesis
 Magnetorheological are utilized in semi-active human prosthetic legs. Much like those used in military and commercial helicopters, a damper in the prosthetic leg decreases the shock delivered to the patients leg when jumping, for example. This results in an increased mobility and agility for the patient.

4 - Optics
 Magneto rheological finishing,  a magnetorheological fluid-based optical polishing method, has proven to be highly precise. It was used in the construction of the [|Hubble Space Telescope] 's corrective lens.


 * Videos and pictures demonstrating the functions of the materials : **
 * Videos and pictures demonstrating the functions of the materials : **


 * [|Magneto-Rheological Fluid] **


 * Magnetorheological fluid used in Liquid Body Armor **






 * ** External material for further readings : **
 *  [|Experimenting with magnetorheological fluids] **


 * [|Howstuffworks.com liquid body armor]**

[|How Smart Structures Will Work]


 * ** References list : **

1- Mark R., Jonathan W., & Carlson J. Properties and Applications of Commercial Magnetorheological Fluids. In //Coe.Montana.////Retrieved February 26, 2012, from//[]

2- Hong-yun W. & Shuang L. (2008 ,December)Mechanical properties of magnetorheological fluids under squeeze-shear mode. In // Harvard. Retrieved February 26, 2012, from//[]

3- //Rmcybernetics.// [|Magnetic Liquids Experiment]. //Retrieved February 26, 2012, from// []

4- Weiss, K.D., J.D. Carlson and D.A. Nixon, 1994. “Viscoelastic Properties of Magneto- and ElectroRheological Fluids,” J. Intell. Mater. Syst. and Struct. 5, 772-775.