Experimental investigations of the functional morphology of dragonfly wings

doi:10.1088/1674-1056/22/8/088702

Abstract Nowadays, the importance of identifying the flight mechanisms of the dragonfly, as an inspiration for designing flapping wing vehicles, is well known. An experimental approach to understanding the complexities of insect wings as organs of flight could provide significant outcomes for design purposes. In this paper, a comprehensive investigation is carried out on the morphological and microstructural features of dragonfly wings. Scanning electron microscopy (SEM) and tensile testing are used to experimentally verify the functional roles of different parts of the wings. A number of SEM images of the elements of the wings, such as the nodus, leading edge, trailing edge, and vein sections, which play dominant roles in strengthening the whole structure, are presented. The results from the tensile tests indicate that the nodus might be the critical region of the wing that is subjected to high tensile stresses. Considering the patterns of the longitudinal corrugations of the wings obtained in this paper, it can be supposed that they increase the load-bearing capacity, giving the wings an ability to tolerate dynamic loading conditions. In addition, it is suggested that the longitudinal veins, along with the leading and trailing edges, are structural mechanisms that further improve fatigue resistance by providing higher fracture toughness, preventing crack propagation, and allowing the wings to sustain a significant amount of damage without loss of strength.

Keywords: dragonfly wings SEM tensile test nodus longitudinal corrugation

Received: 23 January 2013
Revised: 05 March 2013
Accepted manuscript online:

PACS:	87.85.J-	(Biomaterials)
	81.05.Zx	(New materials: theory, design, and fabrication)
	87.19.R-	(Mechanical and electrical properties of tissues and organs)
	87.18.-h	(Biological complexity)

Corresponding Authors: H. Rajabi
E-mail: harajabi@ahrar.ac.ir

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H. Rajabi, A. Darvizeh Experimental investigations of the functional morphology of dragonfly wings 2013 Chin. Phys. B 22 088702

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Experimental investigations of the functional morphology of dragonfly wings

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