Abstract
Auxetic metamaterials have numerous excellent characteristics, such as low mass density, high specific stiffness/ strength and high impact resistance, triggering many potential applications in engineering fields. In this work, we propose a new type of three-dimensional (3D) architectured re-entrant circular (REC) auxetic metamaterial by orthogonally overlapping the two-dimensional (2D) REC honeycomb. Crushing responses of the 3D REC metamaterial under quasi-static compression load were investigated through experimental tests and numerical simulations. The 3D REC sample was additively manufactured and tested under uniaxial quasi-static compression. Experimental and numerical results revealed that the 3D REC sample showed an “X” deformation mode, and fracture failures occurred at the joints of horizontal straight and sloped arc struts. Meanwhile, the numerical results have good agreements with the experimental results in terms of deformation mode, failure mechanism and crushing force. In addition, we investigated the effects of cell number, geometric parameters and friction coefficient on the deformation mode, crushing stress, specific energy absorption (SEA) and Poisson’s ratio of the REC metamaterials. Finally, the proposed metamaterial was compared with 2D REC honeycomb and 3D re-entrant (RE) structure under the condition of ensuring the same relative density. The numerical results demonstrated that the SEA value of 3D REC metamaterial is 7.41 times and 1.27 times that of 2D REC honeycomb and 3D RE structure respectively, which means that the three-dimensional design has better energy absorption capacity.
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