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Effect of bolt diameter and washer on structural damping of layered and jointed copper structures

Abstract In this work, the mechanism of damping in layered and jointed structures with connecting bolts and washers has been studied in detail. Extensive experiments have been conducted on a number of copper specimens with connecting bolts of various diameters to study its effect on the damping capacity of the layered and jointed structures, and to establish the authenticity of the theory developed. The intensity of the interface pressure, diameter of the connecting bolts, washer type, frequency and amplitude of excitation, along with the number of layers, are found to play a vital role on the damping capacity of such structures. It is established that the damping capacity of structures joined with connecting bolts can be improved considerably by increasing the number of layers connected with bolts of smaller diameters and washers.