## What is/are Auxetic Honeycomb?

Auxetic Honeycomb - The three-layer double curved shallow shell consists of auxetic honeycombs core layer with NPR integrated, isotropic homogeneous materials at the top and bottom of surfaces.^{[1]}This paper studies the nonlinear free and forced vibration of sandwich cylindrical panel on visco-Pasternak foundations in thermal environment subjected to blast load The sandwich cylindrical panel consists of auxetic honeycombs core layer and two CNTRC face sheets.

^{[2]}This work investigates the effects of cracking on the overall properties of brittle auxetic/non-auxetic honeycombs.

^{[3]}Auxetic honeycombs showing negative Poisson’s ratio (NPR) effects have attracted extensive attentions due to their excellent mechanical properties, among which those with the innovative re-entrant circular (REC) unit cells have proven to present higher energy absorption capabilities than their equivalents with conventional re-entrant (RE) units, under quasi-static loading.

^{[4]}Based on the theory of periodic solution and bifurcation of nonlinear dynamics, we mainly focus on the nonlinear vibration behaviors and parameter control of a simply supported concave hexagonal composite sandwich plate with negative Poisson's ratio in auxetic honeycombs subjected to in-plane and transverse excitation.

^{[5]}Results show that in the premise of honeycombs possessing the same relative density, the indentation resistance of auxetic hexagonal honeycombs is not always higher than that of the non-auxetic honeycombs.

^{[6]}Recently, the auxetic honeycombs with negative Poisson's ratio attract a substantial attention for different engineering products.

^{[7]}Recently, auxetic honeycombs have attracted considerable attention for their excellent mechanical properties, especially the potential applications for energy absorption.

^{[8]}The sandwich plate is composed of auxetic honeycombs core layer with negative Poisson's ratio integrated with nanocomposite at the top and bottom surfaces.

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## Graded Auxetic Honeycomb

A novel angle graded auxetic honeycomb (AGAH) core is designed for sandwich structures in the present study.^{[1]}Using the selective laser melting method, the unidirectionally-graded auxetic honeycomb (UGAH) and bidirectionally-graded auxetic honeycomb (BGAH) with the equal mass were fabricated to conduct the compression tests.

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## auxetic honeycomb core

This paper describes the static and fatigue bending behaviour of a bio-based sandwich structure with conventional and auxetic honeycomb core.^{[1]}The dynamic response of cylindrical sandwich panels with aluminum foam core, hexagonal honeycomb core, and auxetic honeycomb core are compared numerically.

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## auxetic honeycomb layer

In this study, an analytical solution is presented to determine the buckling load of composite cylindrical shells with an auxetic honeycomb layer under a uniform axial load.^{[1]}This paper studies the fatigue behavior of auxetic honeycomb layer/substrate structures due to interfacial delamination damage.

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