Abstract
The resonance apparatus was developed to characterize the damping properties of materials. The apparatus has been used extensively to determine Young’s modulus and loss factor of polymers in the kHz frequency range over a temperature range of -60 °C to 70 °C. However, very little work has been done in using the apparatus to characterize metallic materials. To demonstrate the limits of the instrument, measurements were made on a high damping material, an epoxy polymer, and a low damping material, aluminum. The loss factor for the epoxy polymer is 2.4, which is the highest value measured in this apparatus. The loss factor for the aluminum is 0.003, which is the lowest value measured in this apparatus. Based on the aluminum results, the accuracy and precision were found to be 2 pct for Young’s modulus. However, the accuracy and precision for loss factor were not as good as for the modulus.
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