Experimental Analysis of Damping across Joints in Metal Plates


Article Preview

In the current world of engineering, structural vibration problems continue impact the design and construction of a wide range of products. Amid the parameters that determine the dynamic behaviour of a structure the one that takes into account the dissipation of energy resulting in the decay of the vibration is the least understood and the most difficult to quantify [1]. The estimation of damping factors is of interest in most branches of engineering sciences. In the field of aircraft structures the damping directly affects the fatigue life, a parameter which is applied conservatively due to the inherent complexity in modelling the damping of built up structures and the potentially catastrophic consequences of a fatigue failure. One of the most important problems is the limited knowledge of how joints affect the damping of the complete structure. This work therefore addresses this issue and focuses on the damping of joints in metal plates as part of a larger project to investigate the damping of built up structures. Various plate configurations are experimentally investigated using two different approaches. The results from the configurations are compared and discussed along with the advantages and disadvantages of each experimental approach. This enables a link to be identified between the damping magnitudes and the mode shapes and joint stiffnesses.



Edited by:

Patrick Sean Keogh




S.J.I. Walker et al., "Experimental Analysis of Damping across Joints in Metal Plates", Applied Mechanics and Materials, Vols. 5-6, pp. 391-398, 2006

Online since:

October 2006





[1] D.J. Ewins: Modal Testing, Theory Practice and Application, Research Studies Press LTD., Baldock, England, (2000).

[2] D. Gregory and D. Segalman: Some experimental and computational efforts to understand the dynamics of structures with bolted joints. Microdynamics Workshop, 23-24 June, 1999, Pasadena, CA, USA.

[3] L.A. Bergman and A.F. Vakakis: Damping in bolted joints. DOE SNL BF-0162, Sandia National Laboratories, (2000).

[4] J. Esteban and C.A. Rogers: Energy dissipation through joints: theory and experiments. Computers and Structures, Vol. 75, 2000, pp.347-359.

DOI: https://doi.org/10.1016/s0045-7949(99)00096-6

[5] B.P. Jarvis: Simple Joint Models. Proceedings of ISMA 25, 2000, Vol. 2.

[6] L. Gaul and J. Lenz: Nonlinear dynamics of structures assembled by bolted joints. Acta Mechanica, Vol. 125, 1997, pp.169-181.

DOI: https://doi.org/10.1007/bf01177306

[7] S. Moaveni: Finite Element Analysis: Theory and Application with ANSYS, Prentice Hall, 1999. ISBN: 0137850980.

[8] C.H. Hodges, J. Power and J. Woodhouse: The use of the sonogram in structural acoustics and an application to the vibrations of cylindrical shells. Journal of Sound and Vibration, Vol 101, No. 2, 1985, pp.203-218.

DOI: https://doi.org/10.1016/s0022-460x(85)81216-5

[9] W.E. Baker, W.E. Woolam, W.E. and D. Young: Air and internal damping of thin cantilever beams. International Journal for Mechanical Science, Vol. 9, 1967, pp.743-766.

DOI: https://doi.org/10.1016/0020-7403(67)90032-x

[10] S.W. Earles: Theoretical estimation of the frictional energy dissipation in a simple lap joint. Journal of Mechanical Engineering Science, Vol. 8, No. 2, 1966, pp.207-214.

DOI: https://doi.org/10.1243/jmes_jour_1966_008_025_02

[11] G. Maidanik: Energy dissipation associated with gas pumping in structural joints. Journal of Acoustic Society of America, Vol. 40, No. 5, 1966, pp.1064-1072.

DOI: https://doi.org/10.1121/1.1910189

[12] C. Beards and J. William: The damping of structural vibration. Journal of Sound and Vibration, No. 53, 1977, pp.333-340.

[13] A. Wylie: Vibration damping in structural joints, Fourth year project, University of Cambridge, 1997/(1998).