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Développement et caractérisation statique et dynamique d'un composite sandwich à âme auxétique et à constituants naturels

Abstract : In recent years, bio-based composite materials have been used in different industrial sectors due to their environmental interests. The use of a biological matrix reinforced with vegetable fibers makes it possible to improve not only environmental protection but also mechanical performance. On the other hand, auxetic structures have emerged as a result of their high specific properties and especially their great energy absorption capacities. In this context, this study proposes to develop a composite sandwich material with a re-entrant honeycomb core and a purely natural constituent. In order to build this structure, the additive manufacturing method was used. First, the static tensile behavior of the skins is analyzed. The elastic characteristics of the printed specimens in different directions are determined. Subsequently, the mechanical properties of auxetic cores in tension and in compression as well as those of sandwiches in bending and indentation were developed. An analysis of damage mechanisms during indentation tests is performed using the acoustic emission technique. Then, experimental tests and analytical models were carried out to determine the fatigue behavior of the sandwiches. Finally, a study of the vibration behavior of the skin, cores and sandwiches is carried out using an experimental and numerical study by finite element. The contribution of each component in the global damping properties is discussed.
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Submitted on : Monday, November 2, 2020 - 1:03:19 AM
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  • HAL Id : tel-02985186, version 1

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Khawla Essassi. Développement et caractérisation statique et dynamique d'un composite sandwich à âme auxétique et à constituants naturels. Mécanique des matériaux [physics.class-ph]. Université du Maine; École nationale d'ingénieurs de Sfax (Tunisie), 2020. Français. ⟨NNT : 2020LEMA1025⟩. ⟨tel-02985186⟩

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