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Enhancing energy absorption of geopolymer-based perforated auxetic metamaterials by peanut-shaped holes
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DOI：10.1016/j.istruc.2026.112422.png)
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Abstract
En 中文
Traditional lightweight cementitious materials are limited by their inherent brittleness, leading to insufficient toughness and deformation capacity. To address this, a novel lightweight green geopolymer-based perforated auxetic metamaterial (GPAM) is developed in this study, integrating the extraordinary deformation mechanics of perforated auxetic metamaterials (which exhibit lateral contraction under compression) and the enhanced toughness of PVA-fiber-reinforced geopolymer matrix. Two perforation types are designed and compared: a bionic peanut shape and a traditional ellipse. Quasi-static compression tests and validated finite element simulations reveal that, under identical porosity (50%) and pore aspect ratio, the peanut-shaped GPAM (P-GPAM) significantly outperforms its elliptical counterpart (E-GPAM) in strength, stiffness, and energy absorption. Crucially, the P-GPAM exhibits a specific energy absorption (SEA) 2.71 times greater than the E-GPAM, despite both showing obvious auxetic behavior with the minimum negative Poisson's ratio (NPR) of −0.88 and −1.01, respectively. The parametric analysis, covering a porosity range of 30–60%, further demonstrates that the P-GPAM shows weaker auxetic behavior when the porosity is less than 30%. As the porosity increases to 45%, the structure achieves optimal performance, with NPR of −0.8 and SEA 2.47 times higher that at 60% porosity. Both the porosity and pore aspect ratio have a significant impact on the structural stiffness. This study provides a novel strategy for creating high-performance, lightweight functional building structures with promising applications in seismic resistance and impact protection. The further dynamic response under impact or fatigue loads will be studied in the future.
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