16 May 2005 Hybrid polymer matrix Terfenol-D composite/PMN-PT transducer in mechanical series configuration
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Combining smart materials with other materials to form composites has received attention due to the possibility of obtaining improved performance and functionality. One such composite combines Terfenol-D particulates with a soft epoxy, with the particles magnetically aligned in one direction forming an anisotropic structure. In this paper we consider the fabrication of the particle composites and the implementation of the composites in a hybrid Ferroelectric/ferromagnetic transducer presented previously. The composite was first tested quasistatically for obtaining material property information and identifying suitable bias conditions. The transducer was then tested for dynamic response, both of the individual parts and with the full system powered, for purposes of validating the concept of hybrid actuation and the model. The transducer is modeled through basic mechanical vibration principles, electroacoustics theory, and constitutive relations for electrostrictive and magnetostrictive materials operated in linear regimes. The paper highlights the advantageous properties of the Terfenol-D composite when utilized in this hybrid transducer in regard to the increased resistivity, decreased eddy current losses, and reduced density. The paper also proposes a model based approach for understanding the factors that control the reduced, and hence disadvantageous in some cases, stiffness and electromechanical coupling coefficient of the Terfenol-D composite.
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Anthony P. Mortensen, Anthony P. Mortensen, Marcelo J. Dapino, Marcelo J. Dapino, "Hybrid polymer matrix Terfenol-D composite/PMN-PT transducer in mechanical series configuration", Proc. SPIE 5761, Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics, (16 May 2005); doi: 10.1117/12.600110; https://doi.org/10.1117/12.600110

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