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Experimental Investigation of Terfenol-D's Elastic Modulus

Aerospace Engineering, Iowa State University, Ames, IA 50011, USA

Alison Flatau

Aerospace Engineering, University of Maryland, College Park, MD 20742, USA, aflatau{at}umd.edu

The variability of Young's modulus (the E effect) in giant magnetostrictive Terfenol-D has a significant impact on the performance and modeling of Terfenol-D transducers. In this investigation, Terfenol-D's modulus of elasticity is characterized under controlled thermal, magnetic, and mechanical loading conditions. Quasistatic cyclic compressive stress testing methods are used to quantify the variability in Young's modulus over a wide range of DC applied magnetic fields and stresses. Apparent elastic modulus changes of four-fold or more are demonstrated through the variation of a DC applied magnetic field. The effect of decreasing cyclic stress amplitude giving rise to an increase in Terfenol-D's apparent elastic modulus is also examined.

Key Words: Terfenol-D • magnetostriction • transducer • elastic modulus • delta-E effect.

This version was published on May 1, 2008

Journal of Intelligent Material Systems and Structures, Vol. 19, No. 5, 583-595 (2008)
DOI: 10.1177/1045389X07077854


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