Abstract
Abstract In this study, a series of in-plane hexagonal honeycombs with different Poisson's ratio induced by topological diversity are studied, considering re-entrant, semi-re-entrant and convex cells, respectively. The crushing strength of honeycomb in terms of Poisson's ratio is firstly presented. In the previous research, we have studied the compression performance of honeycomb with different negative Poisson's ratio. In this study, a comparative study on the local impact resistance of different sandwich panels is conducted by considering a spherical projectile with low to medium impact speed. Some critical criteria (i.e. local indentation profile, global deflection, impact force and energy absorption) are adopted to analyze the impact resistance. Finally, an influential mechanism of Poisson's ratio on the local impact resistance of sandwich panel is studied by considering the variation of core strength and post-impact collapse behavior.
Highlights
In this study, based on the fundamental investigations from the previous study, a comparative study on the local impact resistance of honeycomb sandwich panel with different Poisson’s ratio is conducted
We have studied the compression performance of honeycomb with different negative Poisson’s ratio
A comparative study on the local impact resistance of different sandwich panels is conducted by considering a spherical projectile with low to medium impact speed
Summary
In this study, based on the fundamental investigations from the previous study, a comparative study on the local impact resistance of honeycomb sandwich panel with different Poisson’s ratio is conducted. The impact response and resistance of bionic sandwich structure composed of carbon fiber reinforced plastic (CFRP) panel and aluminum honeycomb structure were studied [17]. As a special honeycomb structure, negative Poisson’s ratio structure has been widely used in engineering applications due to its unique mechanical properties, such as high indentation resistance, high shear stiffness, fracture toughness and good energy dissipation capacity [24]. The complex collapse mechanism of in-plane honeycomb making the cell topology significantly affects the crushing behaviors and further adjusting the Poisson’s ratio of the honeycomb core. A series of Poisson’s ratio for in-plane honeycombs have been defined by considering the connection between Poisson’s ratio and cell topology [8]
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