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Journal of Experimental Biology 125,361-372 (1986)
Published by Company of Biologists 1986

An Approach to the Mechanics of Pleating in Dragonfly Wings

D. J. S. Newman 1 and R. J. Wootton 1

1 Department of Biological Sciences, University of Exeter

A structural engineering approach to the pleated wings of Odonata has been developed during a functional study of wing morphology in the group. The wing can be regarded as a folded plate structure within which each pleat-side acts as a deep plate-girder. Small cross-veins act as stiffeners within the girders, allowing the membrane to carry web shearing forces as pure tension, through a stressed-skin effect. Bending experiments confirm that the membrane significantly increases the rigidity of wing components. The properties of the membrane are unknown. It lacks birefringence, is very thin, and may be pure epicuticle. The advantages of stressedskin construction are discussed, and possible modes of structural failure considered. The wing seems adapted to yield reversibly to unpredictable heavy loads.

Key words: Odonata, dragonflies, wings, flight, engineering, pleating, membrane.

Accepted on June 16, 1986


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© The Company of Biologists Ltd 1986