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Dynamic Magnetomechanical Properties of Terfenol-D/Epoxy 1-3 Particulate Composites

[+] Author Affiliations
Siu Wing Or, Geoffrey P. McKnight, Nersesse Nersessian, Gregory P. Carman

University of California at Los Angeles, Los Angeles, CA

Paper No. IMECE2002-33998, pp. 65-70; 6 pages
doi:10.1115/IMECE2002-33998
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Adaptive Structures and Materials Systems
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Aerospace Division
  • ISBN: 0-7918-3625-8 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

This paper describes the effect of particulate crystallographic orientation on the dynamic magnetomechanical properties of Terfenol-D/epoxy 1–3 magnetostrictive particulate composites. Two different types of composites with approximately 50% Terfenol-D volume fraction were fabricated for comparison with [112]-textured monolithic Terfenol-D. In the first type, needle-shaped, [112]-oriented particles cut from the monolithic Terfenol-D were used and in the second type, irregular-shaped, randomly oriented particles ball-milled from the monolithic material were employed. Elastic moduli (E33 H and E33 B ), dynamic strain coefficient (d33 ), and magnetomechanical coupling coefficient (k33 ) were investigated as a function of bias field. Both composites demonstrate similar property trends with the negativeE, d33 , and k33 values maximizing near 30 kA/m. The maximum values achieved in the oriented type are up to 67% larger than the non-oriented type and approaches 65% of the monolithic Terfenol-D. The property improvement in the oriented type is shown to be attributed to [112] preferential particulate orientation.

Copyright © 2002 by ASME

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