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Proceedings Paper

High shear rate characterization of magnetorheological fluids
Author(s): Andrew C. Becnel; Wei Hu; Norman M. Wereley
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Paper Abstract

Shear mode or rotary drum-type magnetorheological energy absorbers (MREAS) are an attractive option for use in occupant or payload protection systems that operate at shear rates well over 25,000 s-1. However, their design is still performed using material properties measured using low-shear rate (<1,000 s-1) characterization techniques. This paper details a method for characterizing MR fluids at high shear rates, and presents characterization results for three commercially available MR fluids. It is proposed to utilize the perspective of apparent viscosity (the ratio of shear stress over shear rate) vs. shear rate to describe the behavior of the fluid at these shear rates. Good agreement between the measured data and predictions of MR fluid behavior are achieved using this framework. By expanding the knowledge of MR fluid behavior to these high shear strain rates, the design of MREAs is enabled for occupant protection systems for crash and mine blast events.

Paper Details

Date Published: 30 March 2012
PDF: 10 pages
Proc. SPIE 8341, Active and Passive Smart Structures and Integrated Systems 2012, 83410O (30 March 2012); doi: 10.1117/12.916086
Show Author Affiliations
Andrew C. Becnel, Univ. of Maryland, College Park (United States)
Wei Hu, Univ. of Maryland, College Park (United States)
Norman M. Wereley, Univ. of Maryland, College Park (United States)

Published in SPIE Proceedings Vol. 8341:
Active and Passive Smart Structures and Integrated Systems 2012
Henry A. Sodano, Editor(s)

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