Research Information System
INTERNATIONAL JOURNAL OF PROTECTIVE STRUCTURES, vol.0, no.0, pp.1-24, 2022 (ESCI)
Auxiliary metamaterials designed according to the Negative Poisson’s Ratio (NPR) property are
exciting structures due to their high impact strength, impact energy absorption abilities, and
different damage mechanisms. These good mechanical features are suitable for aviation, automotive,
and protective construction applications. These structures, whose most significant disadvantages
are production difficulties, have become easier to produce with the development of 3D production
technology and have been the subject of many studies in recent years. In this presented study, two
conventional core geometries and three different auxetic geometries, commonly used in sandwich
structures, were designed and produced with 3D printer technology. The strength and energy
absorption capabilities of prototype sandwich structures investigated experimentally under bending
loads with static and dynamic compression. Except for the re-entrant (RE) type core, the auxetic
core foam sandwich structures demonstrate higher rigidity and load-carrying capacity than classical
sinusoidal corrugated (SC) core and honeycomb (HC) core sandwich structures under both quasistatic and impact-loaded compression and three-point bending experiments. Double arrowhead
(DAH) and tetrachiral (TC) auxetic cores outperformed honeycomb core in terms of specific quasistatic and impact load-bearing performance under compression by 1.5 ± 0.25 times. In three-point
bending experiments under both quasi-static and impact loading conditions, the load-carrying
capacity of the double arrowhead and tetrachiral auxetic cores was found to be more than 1,86 ±
0.38 times that of the honeycomb core sandwich panels.