posted on 2013-01-21, 11:51authored byE.P. Bowyer, Peter Nash, Victor V. Krylov
In this paper, the results of the experimental investigation into the addition of indentations of power-law profile into
composite plates and panels and their subsequent inclusion into composite honeycomb sandwich panels are reported. The
composite plates in question are sheets of composite with visible indentations of power-law profile. A panel is a sheet of
composite with the indentations encased within the sample. This makes a panel similar in surface texture to an
un-machined composite sheet (reference plate) or conventional honeycomb sandwich panel. In the case of quadratic or
higher-order profiles, the above-mentioned indentations act as two-dimensional acoustic black holes (ABH) for flexural
waves that can absorb a large proportion of the incident wave energy. For all the composite samples tested in this investigation,
the addition of two-dimensional acoustic black holes resulted in further increase in damping of resonant vibrations,
in addition to the already substantial inherent damping due to large values of the loss factor for composites. Due to large
values of the loss factor for composite materials, there was no need to use attached absorbing layers to implement the
acoustic black hole effect.
History
School
Aeronautical, Automotive, Chemical and Materials Engineering
Department
Aeronautical and Automotive Engineering
Citation
BOWYER, E.P., NASH, P. and KRYLOV, V.V., 2013. Damping of flexural vibrations in glass fibre composite plates and honeycomb sandwich panels containing indentations of power-law profile. Proceedings of Meetings on Acoustics - 164th Meeting of the Acoustical Society of America, Kansas City, Missouri, 22-26 October 2012, 18, 030004, 13pp.