Experimental and numerical research on foam filled re-entrant cellular structure with negative Poisson's ratio: Fid-Bau Portal

Experimental and numerical research on foam filled re-entrant cellular structure with negative Poisson's ratio

Yu, Rong / Luo, Wei / Yuan, Hua / Liu, Jingxi / He, Wentao / Yu, Zixian

Abstract Mechanical behaviors of a new foam filled 2D re-entrant hexagonal honeycomb with negative Poisson's ratio under planar compression have been investigated in this paper. Re-entrant hexagonal unit cell specimens were fabricated by aluminum alloy and polyurethane foam. The deformation modes and force-displacement curves of the unit cell specimens under compression were carried out experimentally and numerically, and a good agreement was observed between experimental results and numerical simulation results. Subsequently, mechanical behaviors of foam filled and void re-entrant hexagonal honeycomb under planar compression were observed by numerical simulation. Compared to the void honeycomb, the foam filled honeycomb has a higher specific energy absorption capability due to a higher plateau stress. According to the mechanism of auxetic effect, the re-entrant honeycomb would move inward when subjected to compression along the orthogonal direction, which cause a biaxial compression of the foam and an increasing of stiffness/strength/energy absorption capability. The present investigations provide thorough insight into the strengthened re-entrant hexagonal cellular honeycomb, and could be used in the development of novel light weight smart functional structures.

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Highlights • A new foam filled 2D re-entrant hexagonal honeycomb with negative Poisson's ratio topology is proposed. • Auxetic behavior of foam filled re-entrant honeycomb is presented. • Excellent specific energy absorption of the foam filled honeycomb due to higher plateau stress is presented.