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Damage characterisation of flax fibre fabric reinforced epoxy composites during low velocity impacts using high-speed imaging and Stereo Image Correlation

Abstract : This work aims at studying the low velocity impact and post-impact behaviour of flax/epoxy composites. The samples were composed of 8 plies of 2/2 twill weave fabric. The experimental device used for impact tests was a drop tower with impact energies varying from 5 to 34 J (perforation). Pictures of the sample were captured during the test with two high-speed cameras in order to perform high-speed imaging and Stereo Image Correlation (SIC) analysis. Residual properties have been assessed by bending after impact tests. High-speed imaging easily detected the back face cracks at maximum deflection while some were almost invisible after impact. The results also highlighted the material’s behaviour in three-stages. At low energy, no damage was observed. The cracks and the recovered energy evolved proportionally with the impact energy between 5 and 25 J, and then reached a threshold. The post-impact tests showed that even a 5 J impact resulted in a degradation of composite performance, with a loss of approximately 10% in stiffness and 21% in strength.
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http://hal.univ-smb.fr/hal-01814975
Contributor : Amélie Cuynet <>
Submitted on : Wednesday, June 13, 2018 - 4:55:41 PM
Last modification on : Tuesday, March 3, 2020 - 3:53:25 PM

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Amélie Cuynet, Daniel Scida, Émile Roux, Franck Toussaint, Rezak Ayad, et al.. Damage characterisation of flax fibre fabric reinforced epoxy composites during low velocity impacts using high-speed imaging and Stereo Image Correlation. Composite Structures, Elsevier, 2018, 202, pp.1186-1194. ⟨10.1016/j.compstruct.2018.05.090⟩. ⟨hal-01814975⟩

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