Electrorheological (ER) materials are suspensions of specialized, micron-sized particles in nonconducting oils. When electric fields are applied to ER materials, they exhibit dramatic changes (within milli-seconds) in material properties. Pre-yield, yielding, and post-yield mechanisms are all influenced by the electric field. Namely, an applied electric field dramatically increases the stiffness and energy dissipation properties of these materials. A previously known cubic equation which describes the flow of fluids with a yield stress through a rectangular duct can be applied to annular flow, provided that certain conditions on the material properties are satisfied. An analytic solution and a uniform approximation to the solution, for the rectangular duct Poiseuille flow case is presented. A numerical method is required to solve the flow in annular geometries. The approximation for rectangular ducts is extended to deal with the annular duct case.
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September 1996
Research Papers
Electrorheological Dampers, Part I: Analysis and Design
H. P. Gavin,
H. P. Gavin
Department of Civil and Environmental Engineering, Duke University, Durham, NC 27708-0287
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R. D. Hanson,
R. D. Hanson
FEMA Disaster Field Office, 245 S. Los Robles, Room 630, Pasadena, CA 91102-6020
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F. E. Filisko
F. E. Filisko
Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109
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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. Sep 1996, 63(3): 669-675 (7 pages)
Published Online: September 1, 1996
Article history
Received:
March 10, 1995
Revised:
March 1, 1996
Online:
December 4, 2007
Connected Content
A companion article has been published:
Electrorheological Dampers, Part II: Testing and Modeling
Citation
Gavin, H. P., Hanson, R. D., and Filisko, F. E. (September 1, 1996). "Electrorheological Dampers, Part I: Analysis and Design." ASME. J. Appl. Mech. September 1996; 63(3): 669–675. https://doi.org/10.1115/1.2823348
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