Study of damping in layered and jointed welded structures Online publication date: Mon, 21-Sep-2009
by Bhagat Singh, B.K. Nanda
International Journal of Design Engineering (IJDE), Vol. 2, No. 2, 2009
Abstract: Vibration and noise reduction are crucial in maintaining high performance level and prolonging the useful life of machinery, automobiles, aerodynamic and spacecraft structures. It is observed that damping is caused by energy dissipation due to micro-slip along frictional interfaces. In this paper, a layered and jointed welded cantilever beam model has been considered for examining the vibration energy dissipation due to interfacial friction of jointed structures. Experiments are performed on mild steel specimens with a number of layers under different initial conditions of vibration to validate the theory developed. It is found that the interface pressure distribution characteristics, number of contacting layers, amplitude and frequency of vibration, length and thickness of specimen govern the damping capacity of jointed layered structures with welded joints. These results can be positively exploited in the design of machine tools, aircrafts, spacecrafts, satellites, automobiles and missile systems effectively to maximise their damping capacity.
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