Innovative auxetic tubular reinforced metamaterial: Design and mechanical performance
Yinchuan He, Tingting Wang, Guoxing Lu, Li Wang, Kwong Ming Tse
Abstract
• The proposed ATR structure exhibits auxetic behavior in both axial and radial compression. • The proposed ATR exhibits enhanced EA (+215 %) and EAE (+46 %) in axial compression compared to AT. • The proposed ATR exhibits enhanced EA (+514 %) and EAE (+52 %) in radial compression compared to AT. • The rotation angle of the straight rib structure is the key parameter to change the Poisson's ratio. In this study, we present the design, fabrication, and investigation of an innovative auxetic tubular reinforced (ATR) metamaterial. The mechanical properties and deformation characteristics of ATR metamaterials were comprehensively analyzed under quasi-static compression in both axial and radial directions. We conducted a comparative analysis between the ATR metamaterials and the original auxetic tubular (AT) metamaterials, employing both experimental and finite element methods. The findings indicate that the ATR structure surpasses the original AT structure in terms of mechanical properties during quasi-static compression in both directional orientations. Subsequently, a meticulous parametric analysis of the rotation angle of the reinforced straight ribs, a pivotal structural parameter, was conducted. The outcomes revealed that the rotation angle of the reinforced straight ribs, serving as a geometric parameter, can effectively influence the Poisson's ratio of the ATR structure. As the rotation angle of the reinforced straight rib increases, the ATR structure demonstrates superior energy absorption. The optimized ATR structure, in comparison to the original AT structure, showcases notable enhancements, exhibiting a 215 % improvement in energy absorption (EA), a 62 % increase in specific energy absorption (SEA), and a 46 % rise in energy absorption efficiency (EAE) under axial quasi-static compression. Moreover, under radial quasi-static compression, the optimized ATR structure displays a remarkable improvement, featuring a 514 % increase in EA, a 230 % rise in SEA, and a 52 % enhancement in EAE.