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Proceedings Paper

Statistical analysis of Terfenol-D material properties
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Paper Abstract

Modeling of magnetostrictive Terfenol-D transducer performance requires reliable data on functional trends of the magnetostrictive element's material properties under various operating conditions. A statistical study was designed to experimentally evaluate material properties of 50 Terfenol-D samples under varied mechanical loads, varied ac drive levels, magnetic bias and mechanical prestress typical of transducer applications. This approach is based on a low-signal, linear- magnetomechanical model of the test transducer, and electroacoustics theory. Statistical analysis is provided for the material properties: Young's modulus at constant applied magnetic field, linear coupling coefficient (or axial strain coefficient), magnetomechanical coupling factor, and magnetic permeability at constant strain. Functional relations between material properties and ac drive levels and loads are developed, and corresponding confidence intervals are assessed. The trends show the sensitivity of Terfenol-D material properties to the operating variables and highlight the importance of properly understanding the effects of operating conditions on transducer performance.

Paper Details

Date Published: 6 June 1997
PDF: 12 pages
Proc. SPIE 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems, (6 June 1997); doi: 10.1117/12.275651
Show Author Affiliations
Marcelo J. Dapino, Iowa State Univ. (United States)
Alison B. Flatau, Iowa State Univ. (United States)
Frederick T. Calkins, Iowa State Univ. and ETREMA Products, Inc. (United States)

Published in SPIE Proceedings Vol. 3041:
Smart Structures and Materials 1997: Smart Structures and Integrated Systems
Mark E. Regelbrugge, Editor(s)

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