Detecting moisture in honeycomb sandwich structures using through-thickness resonance measurements

Veidt, Martin, Fay, James, Liew, Chin Kian and Kepple, Jendi (2014). Detecting moisture in honeycomb sandwich structures using through-thickness resonance measurements. In: Rikard Benton Heslehurst, Composites Australia and CRC-ACS Conference 2014: Materials for a Lighter and Smarter World. Composites Australia and CRC-ACS Conference, Newcastle, NSW, Australia, (). 7-9 April 2014.

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Name Description MIMEType Size Downloads
Author Veidt, Martin
Fay, James
Liew, Chin Kian
Kepple, Jendi
Title of paper Detecting moisture in honeycomb sandwich structures using through-thickness resonance measurements
Conference name Composites Australia and CRC-ACS Conference
Conference location Newcastle, NSW, Australia
Conference dates 7-9 April 2014
Proceedings title Composites Australia and CRC-ACS Conference 2014: Materials for a Lighter and Smarter World
Place of Publication Hawthorn, VIC, Australia
Publisher Composites Australia
Publication Year 2014
Sub-type Fully published paper
Open Access Status
ISBN 9780987328533
Editor Rikard Benton Heslehurst
Total pages 15
Collection year 2015
Language eng
Abstract/Summary Sandwich structures are frequently used in transport and civil infrastructure applications where high bending stiffness to weight ratio and excellent strength performance are required. One possible damage mode for sandwich components is moisture ingression creating pockets with liquid water or humid cores in the case of paper based honeycomb materials. Both variants may cause the sandwich structure to deteriorate and lose its stiffness and load carrying capacity. Different methods of non-destructive testing have been tried to detect and quantify moisture ingress. However, the development of a robust and simple measurement technique with the required sensitivity has not yet been achieved. This paper describes a non-destructive testing method using through-thickness resonant modes to detect moisture ingress into honeycomb sandwich structures by detecting changes in through-thickness resonant frequencies as a function of humidity levels. Results from numerical simulation and experimental measurements show that there exists a downward relationship between resonant frequency and volume of moisture ingress. The major conclusion of the work is that the through thickness resonant technique has the potential to be developed into a robust and simple measurement technique to detect and quantify moisture levels in sandwich structures.
Keyword Honeycomb sandwich
Moisture ingression
Non-destructive testing
Resonance testing
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Wed, 18 Mar 2015, 15:14:27 EST by Brianne Mackinnon on behalf of School of Mechanical and Mining Engineering