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Study on Improvement of Damping in Jointed Cantilever Beams Using FEM

R.C. Mohanty , Rajendra Kumar Mohanty , B.K. Nanda

Damping in built-up structures is produced by the energy dissipation due to micro-slip along the frictional interfaces. The analysis of the problem has been carried out using Finite Element Method (FEM). A finite element model of the linear elastic system has been formulated using the Euler-Bernoulli beam theory to investigate the damping phenomena in riveted connections. The discrete element system having two degrees of freedom per node representing v and ï�?¶v ï�?¶x has been used for the analysis. The solution considers one-dimensional beam elements with each one consisting of two nodes having two degrees of freedom, i.e. transverse displacement and rotation at each node. The generalized stiffness and mass matrices for this element has been derived. Extensive experiments have been conducted for the validation of the analysis. From this study, it is established that the damping capacity increases and the natural frequency decreases due to the joint effects.