Abstract
Beetle wings are very specialized flight organs consisting of the veins and membranes. Therefore it is necessary from a bionic view to investigate the material properties of a beetle wing experimentally. In the present study, we have used a Digital Image Correlation (DIC) technique to measure the elastic modulus of a beetle wing membrane. Specimens were prepared by carefully cutting a beetle hind wing into 3.0 mm by 7.0 mm segments (the gage length was 5 mm). We used a scanning electron microscope for a precise measurement of the thickness of the beetle wing membrane. The specimen was attached to a designed fixture to induce a uniform displacement by means of a micromanipulator. We used an ARAMIS™ system based on the digital image correlation technique to measure the corresponding displacement of a specimen. The thickness of the beetle wing varied at different points of the membrane. The elastic modulus differed in relation to the membrane arrangement showing a structural anisotropy; the elastic modulus in the chordwise direction is approximately 2.65 GPa, which is three times larger than the elastic modulus in the spanwise direction of 0.84 GPa. As a result, the digital image correlation-based ARAMIS system was successfully used to measure the elastic modulus of a beetle wing. In addition to membrane’s elastic modulus, we considered the Poisson’s ratio of the membrane and measured the elastic modulus of a vein using an Instron universal tensile machine. The result reveals the Poisson’s ratio is nearly zero and the elastic modulus of a vein is about 11 GPa.
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Jin, T., Goo, N.S., Woo, SC. et al. Use of a digital image correlation technique for measuring the material properties of beetle wing. J Bionic Eng 6, 224–231 (2009). https://doi.org/10.1016/S1672-6529(08)60105-5
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DOI: https://doi.org/10.1016/S1672-6529(08)60105-5