Identification of Damping in Sandwich Beam
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Vibration reduction is a phenomenon that is used to obtain the stability of a member subjected to various loadings. The objective to be fulfilled in this research process is to attain the dynamic stability of the components. Beams used in any machine or mechanism are simple structural members. Structures build in layers are gaining importance these days because of their good vibration damping characteristics. This experimental approach aims to highlight the effect of interfacial slip on the damping of layered and bolted simply supported beams undergoing free vibration. Fabricating the structures in layers and joining them by the means of bolts is the technique used in this problem. The structure engaged with such joints is majorly responsible for energy dissipation where the energy is damped through frictional effects associated with relative displacements due to shear at the interfaces. The parameters that affect the damping capacity of the jointed structures are beam length, thickness ratio, torque of tightening the bolt, number of layers, etc. When a layered beam with bolted joints is acted upon by dynamic loading, the vibrations are produced with some amplitude of excitation at a particular frequency of vibration, and thus damping in a structure occurs by the energy dissipation. It has been established that the factor responsible for 90% of energy getting dissipated in layered structure is interfacial micro-slip.
KeywordsDynamic stability Interfacial slip Energy dissipation Damping
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