Determination of slip damping in jointed riveted beams

Abstract

Built-up structures need to possess an energy dissipation mechanism to damp-out vibrations quickly, which can be achieved effectively by providing joints. Damping in joints is due to the frictional effects associated with relative shear displacements at the interfaces of the connections. This paper presents a finite element approach based on Euler-Bernoulli beam theory to evaluate the damping capacities of cantilever beams of unequal thickness with riveted joints under different dynamic conditions. The solution is based on one-dimensional beam elements, with each element consisting of two nodes with two degrees of freedom, ie. transverse displacement and rotation at each node. The experiments are carried out to authenticate the theory and the results establish that the damping capacity of built-up structures with lower beam thickness ratio and higher cantilever length can be improved substantially using larger diameter rivets undergoing vibration at lower amplitude of excitation.

Keywords:

• Joints
• micro-slip
• interface pressure
• dissipation energy
• damping
• finite element method

Additional information

Notes on contributors

R C Mohanty

Dr Ramesh Chandra Mohanty is a faculty member and Head in the Department of Mechanical Engineering at Centurion University of Technology and Management (CUTM), Jatni, Orissa, India. He received his Master Degree from Biju Pattnaik University of Technology (BPUT), Orissa, India, in 2005. He was awarded his PhD degree in December 2010 from National Institute of Technology (NIT), Rourkela, Orissa, India. His research area is mainly confined to the vibration analysis and design of structures, and vibration control and damping of jointed beams. He has published more than 10 papers in various international journals and conferences.

B K Nanda

Dr Bijoy Kumar Nanda, Professor of Mechanical Engineering at National Institute of Technology, Rourkela, Orissa, India, has been a faculty member for the last 31 years. His fields of specialisation are acoustics and vibration, damping of structures, machine tools, and manufacturing engineering. He has published more than 50 papers in various international and national Journals. He has been the member of the Editorial Board and Reviewer of many international journals. Bijoy has guided many research scholars, edited many conference proceedings, chaired many technical sessions in the national conferences, and has been a member of the advisory committee of international conferences.