Measurement of the strain-dependent damping of metals in axial vibration

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Abstract
The internal vibration-damping characteristics of metallic materials at stress levels of engineering interest have been measured by exciting resonant longitudinal vibration in bar specimens and observing the consequent temperature rise. The method has proved suitable for all stress levels from a few hundred lbf in−2 to stresses near the fatigue limit, and for the range of specific damping capacity encountered in most ferrous and non-ferrous materials. There are no extraneous effects from damping not inherent in the material itself. The present paper describes the apparatus and techniques used, and summarizes the results of a few typical measurements. Detailed results obtained by this method are to be published separately.

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