Abstract
Many investigations of internal friction of metals have been made so far. But, few well-ordered data of frequency dependence of loss factors have been obtained. Furthermore, it seems that incorrect constants of the three element model for visco-elasticity of metals are used sometimes. Therefore engineers who deal with structural vibrations can hardly know damping characteristics of materials. Then measurements of internal friction of mild steel, brass and alminum are made by use of bending, longitudinal and torsional vibrations. The obtained data of loss factors are arranged in relation to frequency. These metals show similar tendencies of damping to one another.
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