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Application of iron-gallium alloy as magnetostrictive sensors
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Paper Abstract

There has been a growing need to develop non-contact sensors for use in real time structural health monitoring. Iron-Gallium alloys (Galfenol, Fe1-xGax, 0.13< x <0.21) appear to be a promising magnetostrictive material for such applications. This work discusses the concepts and methods used in developing a prototype Galfenol sensor for detecting bending induced strains and forces. The proof of concept experiment consists of two Galfenol patches attached on the top and bottom surfaces of an aluminum cantilevered beam. A solenoid applies a biasing magnetic field to the Galfenol patches. The change in Galfenol patch magnetic induction produced by compressive and tensile stresses during bending are continuously measured by a field sensor. The strains on the beam surface and Galfenol sensor surface are also measured using strain gages. The effect of biasing field at constant loading and the effect of loading at constant biasing field on the magnetic induction response have been investigated. A linear magneto-mechanical model for estimating the magnetic induction response for a given mechanical loading is presented.

Paper Details

Date Published: 17 May 2005
PDF: 11 pages
Proc. SPIE 5764, Smart Structures and Materials 2005: Smart Structures and Integrated Systems, (17 May 2005); doi: 10.1117/12.600088
Show Author Affiliations
Supratik Datta, Univ. of Maryland/College Park (United States)
Alison B. Flatau, Univ. of Maryland/College Park (United States)

Published in SPIE Proceedings Vol. 5764:
Smart Structures and Materials 2005: Smart Structures and Integrated Systems
Alison B. Flatau, Editor(s)

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