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Least-weight design of carbon fibre honeycomb sandwich columns

Published online by Cambridge University Press:  04 July 2016

J. P. H. Webber
J. P. H. Webber*
Affiliation:
Department of Aeronautical Engineering, University of Bristol
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Extract

In Ref. 1, an exact theoretical analysis is given for the buckling of sandwich columns in compression. The theory is able to predict both overall buckling and face wrinkling and the present paper extends this work by suggesting a design procedure for obtaining least column weight for a given end load and column length. It is shown how a family of optimum design curves can be obtained for given material properties, which encompass all of the geometrical parameters excepting column width. For a given end load, least weight is obtained with least width, but the limiting factor then becomes one of overall instability in the transverse direction of the column. The columns are not optimum in the sense that the buckling and compressive failure loads are made to occur at the same time. Generally speaking, it is not possible to design to this condition for given core and face plate materials and there is found to be a large margin of safety between the buckling stresses and the ultimate failure stresses.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 83 , Issue 824 , August 1979 , pp. 314 - 319
Copyright
Copyright © Royal Aeronautical Society 1979 

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References

1. Webber, J. P. H., Kyriakides, S. and Lee, C. T. On the wrinkling of honeycomb sandwich columns with lamin ated cross-ply faces. The Aeronautical Journal, Vol 80, p 264, June 1976.Google Scholar
2. Gerard, G. Minimum Weight Analysis of Compression Structures, p 13, New York University Press, 1956.Google Scholar
3. Engineering Sciences Data Unit. Structures Sub-series, Vol 6, Regent St., London.Google Scholar
4. Sherwin, K. Man-powered Flight. Chapter 8, Model and Allied Publications, 1975.Google Scholar
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6. Heppel, P. G. M. and Leaver, E. C. Construction and testing of a carbon fibre primary structure for a man-powered aircraft wing. University of Bristol, Department of Aeronautical Engineering. Undergraduate Rep No 208, June 1977.Google Scholar