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30 March 2010 Magnetomechanical properties of magnetostrictive composites with high volume of fraction Terfenol-D powder
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The role of Smart Magnetic Materials (SMM) is still increasing. One type of SMM are Giant Magnetostrictive Materials (GMM) which can be represented by i.e. Terfenol-D. The biggest difficulty with mechanical application of GMM is its brittleness. On the other hand, increase of frequency generate meaningfully eddy currents. These disadvantages tend to search new solutions in a form of composite materials with giant magnetostriction (GMMC). The matrix for GMMC most often is an epoxy resin with magnetostrictive material inside (in a form of powder, flakes or tiny rods made of i.e. Terfenol-D). Several composites, with outstanding magnetostrictive properties, have been synthesized combining an epoxy resin with polycrystalline powders of Terfenol-D. Application of appropriate way of compression allowed to achieve composites consisting near 70% volume fraction of Terfenol-D powder in comparison with about 48% volume fraction of reinforcement in traditional production way. Composites had random and preferential grain orientation which was obtained by curing the material respectively with or without a magnetic field. The quasistatic magnetomechanical properties of the composites were investigated and compared with monolithic Terfenol-D alloy. The highest response was obtained for a perpendicular polarized composite. Investigated composite are promising magnetostrictive material enable to create a new type of actuators and magnetic field sensor.
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Jerzy Kaleta, Daniel Lewandowski, and Rafal Mech "Magnetomechanical properties of magnetostrictive composites with high volume of fraction Terfenol-D powder", Proc. SPIE 7644, Behavior and Mechanics of Multifunctional Materials and Composites 2010, 76441L (30 March 2010); doi: 10.1117/12.847845;

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