Publication Date

9-21-2020

Department

Electrical and Computer Engineering; Materials Science and Engineering; Ames Laboratory

Campus Units

Ames Laboratory, Electrical and Computer Engineering, Materials Science and Engineering

OSTI ID+

1765698

Report Number

IS-J 10402

DOI

10.1109/TMAG.2020.3024878

Journal Title

IEEE Transactions on Magnetics

Volume Number

57

Issue Number

2

First Page

2500605

Abstract

Magnetorheological elastomers (MREs) are composite materials that consist of magnetically permeable particles in a nonmagnetic polymeric matrix. Under the influence of an external magnetic field, a reversible deformation change occurs in the mechanical properties of these materials. Due to their coupled magnetomechanical response, these materials have been found suitable for a range of applications including tunable vibration absorbers, sensors, and actuators. Notably, improvement of such devices are prerequisites to efficient energy conversion systems, hence the need to understand further the MRE technology. The Jiles-Atherton (JA) theory takes into consideration the magneto-coupling experienced by effective domains in a magnetic material. Algorithm based on the theory yields five model parameters; saturation magnetization (M s ), domain density (a), domain coupling (α), loss coefficient (k), and reversibility (c). Using JA theory, model parameters were calculated and linked to the physical attributes of Fe powder and isotropic MRE. The results show that the calculated Ms for the MRE is reasonably related to that of the Fe powder by a factor of the particle's volume fraction used in the MRE. The calculated k, a, and α provided support for the reduced pinning factor, domain density, and increased domain coupling in the MRE due to the changes in the domain structure between the two materials. From the calculated JA parameters, finite-element modeling (FEM) of the MRE hysteresis loop was performed. The analysis showed that the modeled magnetic properties including coercivity, remanence, and coordinates of the hysteresis loop tip vary with geometric position.

DOE Contract Number(s)

AC02-07CH11358

Language

en

Department of Energy Subject Categories

42 ENGINEERING

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Tuesday, September 21, 2021

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