Abstract
Macro-/Micro-structures and mechanical properties of the elytra of beetles were studied. The Scan Electron Microscope (SEM) and optical microscopy were employed to observe the macro-/micro-structure of the surface texture and cross-section structure of elytra. Nano-indentation was carried out to measure the elastic modulus and the hardness of elytra. Tensile strengths of elytra in lateral and longitudinal directions were measured by a multifunctional testing machine. The coupling force between elytra was also measured and the clocking mechanism was studied. SEM images show the similar geometric structure in transverse and longitudinal sections and multilayer — dense epicuticle and exocuticle, followed by bridge piers with a helix structured fibers, which connect the exocuticle to the endodermis, and form an ellipse empty to reduce the structure weight. The elastic modulus and the hardness are topologically distributed and the mechanical parameters of fresh elytra are much higher than those of dried elytra. The tensile strength of the fresh biological material is twice that of dried samples, but there is no clear difference between the data in lateral and longitudinal directions. Coupling forces measured are 6.5 to 160 times of beetles’ bodyweight, which makes the scutellum very important in controlling the open and close of the elytra. The results provide a biological template to inspire lightweight structure design for aerospace engineering.
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Wang G L, Ren L Q, Chen B C. The detach-shape character of the non-smooth geometrical units’ distributing on the integumentary surface of the Coprisochus Motschulsky. Transactions of the Chinese Society for Agricultural Machinery, 1997, 28, 5–9. (in Chinese)
Li J Q, Ren L Q, Liu C Z, Chen B C. A study on the bionic plow moldboard of reducing soil adhesion and plowing resistance. Transactions of the Chinese Society for Agricultural Machinery, 1996, 27, 1–14. (in Chinese)
Cheng H, Sun J R, Li J Q, Ren L Q. Structure of the integumentary surface of the dung beetle Copris ochus Motschulsky and its relation to non-adherence of substrate particles. Acta Entomologica Sinica, 2002, 45, 175–181. (in Chinese)
Ren L Q, Li J Q, Chen B C. Research on the bionics and anti-resistance of the non-smooth surface. Chinese Science Bulletin, 1995, 40, 1812–1814. (in Chinese)
Chen J X, Ni Q Q, Li Q, Xu Y L. Biomimetic light weight composite structure with honeycomb-trabecula. Acta Materiae Compositae Sinica, 2005, 22, 103–108. (in Chinese)
Chen J X, Ni Q Q. Three dimensional composite structures in the fore-wing of beetles. Acta Materiae Compositae Sinica, 2003, 20, 61–66. (in Chinese)
Chen B, Peng X H, Fan J H. Fiber-reinforce characteristics of chafer cuticle and research on structure of branched fiber. Chinese Journal of Materials Research, 2003, 17, 630–636. (in Chinese)
Gorb S N, Goodwyn P J. Wing-locking mechanisms in aquatic heteroptera. Journal of Morphology, 2003, 257, 127–146.
Goodwyn P J, Gorb S N. Attachment forces of the hemelytra-locking mechanisms in aquatic bugs (Hete-roptera: Belostomatidae). Journal of Insect Physiology, 2003, 49, 753–764.
Gorb S N, Beutel R G, Gorb E V, Jiao Y K, Kastner V, Niederegger S, Popov V L, Scherge M, Schwarz U, Vötsch W. Structural design and biomechanics of friction-based releasable attachment devices in insects. Integrative and Comparative Biology, 2002, 42, 1127–1139.
Breed R S, Ball E F. The interlocking mechanisms which are found in connection with the elytra of Coleoptera. Biological Bulletin, 1908, 15, 289–303.
Holleway B A. Elytra surface structures as indicators of relationships in stag beetles, with reference to the New Zealand species (Coleoptera, Lucanidae). New Zealand Journal of Zoology, 1997, 24, 51–63.
Frantsevich L, Dai Z D, Wang W Y, Zhang Y F. Geometry of elytra opening and closing in some beetles (Coleoptera, Polyphaga). The Journal of Experimental Biology, 2005, 208, 3145–3158.
Weis-Fogh T, Jensen M. Biology and physics of locust flight. I: Basic principles in insect flight. A critical review. Philosophical Transactions of Royal Society London B, 1956, 239, 415–458.
Weis-Fogh T. Biology and physics of locust flight. II: Flight performance of the desert locust. Philosophical Transactions of Royal Society London B, 1956, 239, 459–510.
Jensen M. Biology and physics of locust flight. III: The aerodynamics of locust flight. Philosophical Transactions of Royal Society London B, 1956, 239, 511–552.
Smith C W, Herbert R, Wootton R J, Evans K E. The hind wing of the desert locust. II: Mechanical properties and functioning of the membrane. The Journal of Experimental Biology, 2000, 203, 2933–2943.
Herbert R, Yong P G, Smith C W, Wootton R J, Evans K E, Young P G. The hind wing of the desert locust (Schistocerca gregaria Forskål) III: A finite element analysis of a deployable structure. The Journal of Experimental Biology, 2000, 203, 2945–2955.
Yang Z X, Dai Z D. Progress in bionic research on biomaterials of beetles. Acta Materiae Compositae Sinica, 2008, 25, 1–9. (in Chinese)
Yang Z X, Dai Z D, Guo C. Morphology and mechanical properties of Cybister elytra. Chinese Science Bulletin, 2009, 54, 1767–1772. (in Chinese)
Dai Z D, Zhang Y F, Liang X C, Sun J R. Coupling between elytra of some beetles: Mechanism, forces and effects of surface texture. Science in China Series C: Life Sciences, 2008, 51, 894–901. (in Chinese)
Beament J W L. Wetting properties of insect cuticle. Nature, 1960, 186, 408–409.
Parker A R, Lawrence C R. Water capture by a desert beetle. Nature, 2001, 414, 33–34.
Sun J R, Cheng H, Cong Q, Li J Q, Ren L Q, Chen B C. Bionic study on the dung beetle Copris ochus Motschulsky for reduction of soil adherence. Acta Biophysica Sinica, 2001, 17, 785–793. (in Chinese)
Yang Z X, Wang W Y, Yu Q Q, Dai Z D. Measurements on mechanical parameters and studies on microstructure of elytra in beetles. Acta Materiae Compositae Sinica, 2007, 24, 92–98. (in Chinese)
Kurachi M, Takaku Y, Komiya Y, Hariyama T. The origin of extensive colour polymorphism in Plateumaris sericea. Naturwissenschaften, 2002, 89, 295–298.
Wang F Z, Li R H, Fei Y. Study of light Mg-Li matrix composite. Journal of Materials Science & Engineering, 2003, 21, 134–137. (in Chinese)
Chen P Y, Lin A Y M, McKittrick J, Meyers M A. Structure and mechanical properties of crab exoskeletons. Acta Biomaterialia, 2008, 4, 587–596.
Sachs C, Fabritius H, Raabe D. Experimental investigation of the elastic-plastic deformation of mineralized lobster cuticle by digital image correlation. Journal of Structural Biology, 2006, 155, 409–425.
Vincent J F V, Wegst U G K. Design and mechanical properties of insect cuticle. Arthropod Structure & Development, 2004, 33, 187–199.
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Dai, Z., Yang, Z. Macro-/micro-structures of elytra, mechanical properties of the biomaterial and the coupling strength between elytra in beetles. J Bionic Eng 7, 6–12 (2010). https://doi.org/10.1016/S1672-6529(09)60187-6
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DOI: https://doi.org/10.1016/S1672-6529(09)60187-6