High shear rate characterization of magnetorheological fluids

Andrew C. Becnel; Wei Hu; Norman M. Wereley

doi:10.1117/12.916086

30 March 2012 High shear rate characterization of magnetorheological fluids

Andrew C. Becnel, Wei Hu, Norman M. Wereley

Proceedings Volume 8341, Active and Passive Smart Structures and Integrated Systems 2012; 83410O (2012) https://doi.org/10.1117/12.916086
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

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.

Citation Download Citation

Andrew C. Becnel, Wei Hu, and Norman M. Wereley "High shear rate characterization of magnetorheological fluids", Proc. SPIE 8341, Active and Passive Smart Structures and Integrated Systems 2012, 83410O (30 March 2012); https://doi.org/10.1117/12.916086

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