The damping performance of aluminum-based composites |
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Authors: | Clark A. Updike M.S. Ram B. Bhagat Ph.D. Martin J. Pechersky Ph.D. Maurice F. Amateau Ph.D. |
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Affiliation: | 1. Harris Corporation-GASD, Melbourne, Florida 2. Engineering Science and Mechanics Department, The Pennsylvania State University, USA 3. The Pennsylvania State University, USA
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Abstract: | Metal-matrix composites may offer better damping properties than unreinforced alloys. Because damping properties (and metal-matrix composites) are becoming important in airframe design, the damping capabilities of a number of aluminum-matrix composites were measured over a wide range of frequencies at low strain amplitudes, using a new laser vibrometer technique. Silicon carbide and alumina reinforcements resulted in a material with damping properties similar to that of unreinforced aluminum 6061-T6, but unidirectional and planar-random graphite continuous-fiber reinforcements increased the damping by 5 and 14 times, respectively. The increased damping of the continuous fiber composites is attributed to the absence of interfacial reaction resulting from the high-pressure infiltration method used for their manufacture. |
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