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Assessment of hygrothermal ageing and damage in sandwich foam using TSA

Record type: Conference or Workshop Item (Paper)

The present paper is an introduction to the use of Thermoelastic Stress Analysis (TSA) to assess the response to closed-cell PVC structural foams from damage sustained during service in a marine environment. The effects of damage were accelerated by hygrothermal ageing at a temperature of 60ºC in distilled water. The CTS-type foam specimens contained a scalpel induced ‘edge-crack’ which were loaded at 0º, 10º, 30º, 45º, 60º,80º and 90º to obtain fracture toughness properties. A correlation was observed between increasing foam density and resistance to moisture uptake, with moisture acting as a plasticizer replacing that which has been leached away during immersion. After exposure to moisture specimens exhibited increased brittleness with significant reductions in energy to fracture. Linear foams were found to absorb almost twice the moisture of a cross-linked equivalent, and experience the greatest change in energy to fracture, most notably in shear, the most vulnerable loading mode for a sandwich structure. A CEDIP ‘Silver’ infrared system comprising an array of 320 x 240 detectors was used to perform TSA and evaluate the effects of fracture damage. The system recording capability allows crack propagation to be captured in real-time. The thermoelastic signal data at the crack-tip was related to stress using a calibration constant obtained from a specimen in its aged or unaged states when loaded with a known uniform stress. In addition, a high-resolution lens attachment allowed the cellular response to a crack-tip to be magnified, revealing the complex stress distribution on the thin struts around individual foam cells.

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Citation

Lembessis, E., Dulieu-Barton, J.M. and Shenoi, R.A. (2007) Assessment of hygrothermal ageing and damage in sandwich foam using TSA At 13th International Conference on Experimental Mechanics (ICEM 13). 01 - 06 Jul 2007. 8 pp.

More information

Published date: 2007
Venue - Dates: 13th International Conference on Experimental Mechanics (ICEM 13), 2007-07-01 - 2007-07-06
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 49033
URI: http://eprints.soton.ac.uk/id/eprint/49033
PURE UUID: 9341c4d3-4ab3-4fda-8027-2fb5f8c32f2f

Catalogue record

Date deposited: 22 Oct 2007
Last modified: 17 Jul 2017 14:57

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Contributors

Author: E. Lembessis
Author: R.A. Shenoi

University divisions


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