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A new measurement technique for the estimation of core shear strain in closed sandwich structures

A new measurement technique for the estimation of core shear strain in closed sandwich structures
A new measurement technique for the estimation of core shear strain in closed sandwich structures
Sandwich structures have been widely used for many years in applications such as aircraft panels, marine-craft hulls, racing car bodies and spacecraft solar arrays. Most sandwich panel designs include a lightweight core such as paper honeycomb or closed cell foam encased between two face plates, and in the case of aircraft panels constructed from carbon fibre reinforced plastics, the core is bevelled and edge pan plies are included to totally enclose the core. This type of design restricts access to the core making it almost impossible for the engineer to measure the shear strain developed in the core during in-service static or dynamic loading. This paper introduces a new measurement technique whereby the shear strain in the core can be estimated from face plate measurements using a linear finite difference approximation. The estimation method is presented and supported by calculations on a statically loaded sandwich beam. Static and dynamic experiments were conducted in order to validate the technique using a honeycomb sandwich beam instrumented with strain gauges on the core and face plates. The results showed excellent agreement between measured and estimated core shear strain for sandwich configurations with thin face plates, such as those encountered in aircraft and marine-craft constructions.
sandwich, measurement technique, shear strain, finite difference
0263-8223
319-334
Cunningham, P.R.
678bb28d-d7b5-4c50-b312-0a25cec0c3f5
White, R.G.
d67216d7-2691-4322-9dac-56b96add39e1
Cunningham, P.R.
678bb28d-d7b5-4c50-b312-0a25cec0c3f5
White, R.G.
d67216d7-2691-4322-9dac-56b96add39e1

Cunningham, P.R. and White, R.G. (2001) A new measurement technique for the estimation of core shear strain in closed sandwich structures. Composite Structures, 51 (3), 319-334. (doi:10.1016/S0263-8223(00)00148-3).

Record type: Article

Abstract

Sandwich structures have been widely used for many years in applications such as aircraft panels, marine-craft hulls, racing car bodies and spacecraft solar arrays. Most sandwich panel designs include a lightweight core such as paper honeycomb or closed cell foam encased between two face plates, and in the case of aircraft panels constructed from carbon fibre reinforced plastics, the core is bevelled and edge pan plies are included to totally enclose the core. This type of design restricts access to the core making it almost impossible for the engineer to measure the shear strain developed in the core during in-service static or dynamic loading. This paper introduces a new measurement technique whereby the shear strain in the core can be estimated from face plate measurements using a linear finite difference approximation. The estimation method is presented and supported by calculations on a statically loaded sandwich beam. Static and dynamic experiments were conducted in order to validate the technique using a honeycomb sandwich beam instrumented with strain gauges on the core and face plates. The results showed excellent agreement between measured and estimated core shear strain for sandwich configurations with thin face plates, such as those encountered in aircraft and marine-craft constructions.

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More information

Published date: 2001
Keywords: sandwich, measurement technique, shear strain, finite difference

Identifiers

Local EPrints ID: 21982
URI: http://eprints.soton.ac.uk/id/eprint/21982
ISSN: 0263-8223
PURE UUID: 20b782f4-50ab-45a5-926a-8fbbe8c7a7b8

Catalogue record

Date deposited: 17 Mar 2006
Last modified: 15 Mar 2024 06:33

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Contributors

Author: P.R. Cunningham
Author: R.G. White

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