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Effect of core crush on honeycomb sandwich panels

Record type: Conference or Workshop Item (Paper)

Nomex honeycomb is used as the predominate core material in aerospace standard sandwich structure. To provide aerospace standard composite face sheets it is necessary to cure the sandwich structure in an autoclave at elevated pressure. The honeycomb material is capable of withstanding the forces experienced through its thickness, but the lateral forces applied by the elevated pressure cause a crushing effect on the cells of the material. To prevent this crushing a ‘core stabilisation’ technique is applied to the core, prior to the lay-up of the sandwich panel, which increases the rigidity of the material and protects the cells. The core stabilisation process is time consuming and therefore costly. The current work investigates the effect of core crush on the mechanical properties of sandwich beams, along with the success of eight core treatments to reduce core crush. Without stabilisation, the core crushed by almost 12%, and had a large detrimental effect on the mechanical properties of the beam. However, by curing in a conventional oven at vacuum pressure crushing was prevented and similar mechanical properties to the fully stabilised core were achieved. Finally, the effect of core crush on actual sandwich components is investigated by loaded representative panels on a specialist rig capable of applying representative pressure loads and measuring the stress distribution using full-field thermoelastic stress analysis (TSA).

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Citation

Dulieu-Barton, J.M., Crump, D.A. and Griffith, D., (2010) Effect of core crush on honeycomb sandwich panels Ravichandran, G. (ed.) In Proceedings of the 9th International Conference on Sandwich Structures (ICSS-9). California Institute of Technology. 10 pp.

More information

Published date: June 2010
Venue - Dates: 9th International Conference on Sandwich Structures (ICSS-9), United States, 2010-06-14 - 2010-06-16
Keywords: honeycomb sandwich panel, core crush, TSA
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 159417
URI: http://eprints.soton.ac.uk/id/eprint/159417
PURE UUID: aa071fc4-72d4-44a1-a287-a55e5f43e878

Catalogue record

Date deposited: 30 Jun 2010 08:27
Last modified: 18 Jul 2017 12:37

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Contributors

Author: D.A. Crump
Author: D. Griffith
Editor: G. Ravichandran

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