Tensile Properties of Veins of Damselfly Wing
- 1 Center for Composite Materials Research (CCMR), Department of Mechanical Engineering, North Carolina A & T State University (NC A & T SU), Greensboro, USA.
- 2 Center for Composite Materials Research (CCMR), Department of Mechanical Engineering, North Carolina A & T State University (NC A & T SU), Greensboro, USA.
Abstract
Microtension test of Costa and Radius veins of damselfly wing was conducted to measure tensile strength and modulus. The specimens were classified into fresh and dry depending on when the samples were prepared and tested. Fresh sam ples tested immediately after extracting from the fly while the dry samples were tested one year after extraction and stored in a desiccator. Measured load-displacement response and fracture load were used to calculate modulus and strength. Field Emission Scanning Electron Microscope was used to measure the fracture morphology and cross-section of the vein. The results showed that the veins are brittle and fracture surface is flat. The average strength (232 - 285 MPa) and modulus (14 - 17 GPa) of the Costa and Radius veins were nearly same for both fresh and dry samples. The tensile modulus of the veins was 8% - 10% higher than the indentation (compressive) modulus and was nearly the same as that of human bones.
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