Non destructive inspection of plates using frequency measurements

Kannappan, L. and Shankar, K. (2007). Non destructive inspection of plates using frequency measurements. In: Martin Veidt, Faris Albermani, Bill Daniel, John Griffiths, Doug Hargreaves, Ross McAree, Paul Meehan and Andy Tan, Proceedings of the 5th Australasian Congress on Applied Mechanics (ACAM 2007). 5th Australasian Congress on Applied Mechanics (ACAM 2007), Brisbane, Australia, (215-220). 10-12 December, 2007.

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Author Kannappan, L.
Shankar, K.
Title of paper Non destructive inspection of plates using frequency measurements
Conference name 5th Australasian Congress on Applied Mechanics (ACAM 2007)
Conference location Brisbane, Australia
Conference dates 10-12 December, 2007
Proceedings title Proceedings of the 5th Australasian Congress on Applied Mechanics (ACAM 2007)
Place of Publication Brisbane, Australia
Publisher Engineers Australia
Publication Year 2007
Year available 2008
Sub-type Fully published paper
ISBN 0 8582 5862 5
Editor Martin Veidt
Faris Albermani
Bill Daniel
John Griffiths
Doug Hargreaves
Ross McAree
Paul Meehan
Andy Tan
Volume 1
Start page 215
End page 220
Total pages 6
Collection year 2007
Language eng
Abstract/Summary This paper examines the use of natural frequency measurements and energy formulation of vibration theory to detect damage present in a structure. The extent of change in natural frequencies of the structure due to damage, which is highly dependent on the location and size of damage, is used to detect and characterise damage. An analytical solution to detect and characterise damage in plates from just change in natural frequencies is presented here for the first time. Damage is modelled as a spring with finite stiffness which is less than that of the undamaged structure. Using the strain energies stored in the plate and that of spring, calculated from discrete values of deflection mode shapes, the location and size of the damage is determined. The applicability of this approach is demonstrated through a numerical study, where the location and size of through thickness centre cracks in simply supported plates is deduced with greater than 95 percent accuracy.
Subjects 290501 Mechanical Engineering
0913 Mechanical Engineering
Keyword Crack detection
Centre crack
Plates
Structural health monitoring
Vibration
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

 
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Created: Mon, 10 Mar 2008, 14:33:49 EST by Thelma Whitbourne on behalf of School of Engineering