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...

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Bibliographic Details
Published in:Composite structures 2001-03, Vol.51 (3), p.319-334
Main Authors: Cunningham, P.R., White, R.G.
Format: Article
Language:English
Subjects:
Beams, plates and shells
Computational techniques
Exact sciences and technology
Finite difference
Finite-difference methods
Fundamental areas of phenomenology (including applications)
Mathematical methods in physics
Measurement technique
Physics
Sandwich
Shear strain
Solid mechanics
Structural and continuum mechanics
Structural mechanics (beam, string...)
Theory and numerical methods
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Summary: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.
ISSN:0263-8223
1879-1085
DOI:10.1016/S0263-8223(00)00148-3