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Damping and internal friction have been used extensively in studies concerned with microstructural and macrostructural changes of crystalline materials and with the mechanism causing inelastic deformations. Damping has seldom been used for metals characterization on an engineering level. Some possible reasons are discussed. The energy dissipation of strongly amplitude-dependent metals is determined best by measuring the work per cycle required to maintain a constant kinetic energy for a specimen subjected to bending or torsional vibrations. A mathematical relationship between the kinetic energy and the work per cycle is proposed and compared with experimentally determined data. An excellent correlation has been obtained. Three experimentally determined constants classify the behavior of metals in the range most important for engineering applications.
Technical staff member, Bell Laboratories, Murray Hill, NJ
Stock #: JTE11565J