Energy Dissipation at Structural Joints; Mechanisms and Magnitudes

Abstract
A largely experimental study is described, which indicates that dissipation of vibratory energy at multi-pointfastened (bolted, riveted, spot- welded) joints connecting panels to stiffeners or to other panels, at frequencies considerably above the panel fundamental, is primarily due to the 'pumping' of air produced as adjacent surfaces between fasteners move away from and toward each other. A study of the energy dissipation characteristics of plate-strips whose ends are bolted to rigid supporting structures is discussed. From comparison of data obtained by direct measurement of energy dissipation with analysis for a number of possible mechanisms it is concluded that interface slip plays a minor role in such bolted joints. Damping here appears to be primarily associated with relative motions normal to the mating surfaces.

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