Electrorheological Dampers, Part II: Testing and Modeling

[+] Author and Article Information
H. P. Gavin

Department of Civil and Environmental Engineering, Duke University, Durham, NC 27708-0287

R. D. Hanson

FEMA Disaster Field Office, 245 S. Los Robles, Room 630, Pasadena, CA 91102-6020

F. E. Filisko

Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109

J. Appl. Mech 63(3), 676-682 (Sep 01, 1996) (7 pages) doi:10.1115/1.2823349 History: Received March 10, 1995; Revised March 01, 1996; Online December 04, 2007


Electrorheological (ER) materials develop yield stresses on the order of 5–10 kPa in the presence of strong electric fields. Viscoelastic and yielding material properties can be modulated within milli-seconds. An analysis of flowing ER materials in the limiting case of fully developed steady flow results in simple approximations for use in design. Small-scale experiments show that these design equations can be applied to designing devices in which the flow is unsteady. More exact models of ER device behavior can be determined using curve-fitting techniques in multiple dimensions. A previously known curve-fitting technique is extended to deal with variable electric fields. Experiments are described which illustrate the potential for ER devices in large-scale damping applications and the accuracy of the modeling technique.

Copyright © 1996 by The American Society of Mechanical Engineers
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