DAMPING MEASUREMENTS OF GRAPHITE-ALUMINUM COMPOSITES.
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Continuous fiber reinforced graphite-aluminum (Gr/Al) composites are candidate structural materials for space structures, because of their high specific properties. In addition, design requirements indicate damping as a critical structural or material property. Therefore, the damping capacity of Gr/Al was measured in flexural and extensional modes of vibration by using fixed-free flexure and uniaxial tension-tension cycling test methods respectively. Extraneous sources of vibrational energy losses were identified and minimized to establish the inherent damping characteristics of Gr/Al composites. Damping measurements conducted at low strain levels (50 multiplied by 10** minus **6-700 multiplied by 10** minus **6) and low frequency ranges (0. 4-150 Hz) exhibited strain amplitude dependent behavior.