| Abstrakt: |
Abstract: In the companion paper we describe a new experimental technique for resolving the phase difference between two electrical sinusoidal signals to an accuracy of 2pgr/216 or 9.587×10–7 radians. In this paper we demonstrate the use of that technique in measuring the intrinsic material damping of metal-matrix composites in axial tension using strain gages. In particular, the influence of ply, angle, theta, on the axial damping of a Pitch 55 graphite/6061 aluminum [±theta]s laminate is studied at a fixed frequency, a fixed strain level, and at room temperature. Recently, Ni and Adams proposed a model for predicting theflexural damping of a liminate from the flexural damping properties of a lamina. A close agreement between the model and the experiment was observed. As far as we know these are the first measurements of intrinsic material damping of metal-matrix composites. |
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