Inverse-designed 3D sequential metamaterials achieving extreme stiffness
Jiacheng Han (University of Science and Technology of China)
Xiaoya Zhai (University of Science and Technology of China)
Lili Wang (University of Science and Technology of China)
Di Zhang (University of Science and Technology of China)
Junhao Ding (Chinese University of Hong Kong)
Winston Wai Shing Ma (Chinese University of Hong Kong)
Xu Song (Chinese University of Hong Kong)
Wei Hsin Liao (Chinese University of Hong Kong)
Ligang Liu (University of Science and Technology of China)
Jun Wu (TU Delft - Materials and Manufacturing)
Xiao Ming Fu (University of Science and Technology of China)
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Abstract
Mechanical metamaterials signify a groundbreaking leap in material science and engineering. The intricate and experience-dependent design process poses a challenge in uncovering architectural material sequences with exceptional mechanical properties. This study introduces inverse-designed 3D sequential metamaterials with outstanding mechanical attributes, achieved through a novel computational framework. The explored sequences based on Schoen's I-graph–wrapped package (IWP) and Schwarz Primitive (Schwarz P) surpass the Hashin-Shtrikman upper bound of Young's modulus at relative densities of 0.24 and 0.43, outperforming previous records. Optimized Body-Centered-Cubic (BCC) truss-based sets outperform traditional ones by 72.7%. This innovative approach can be extended for metamaterial customization, involving the optimization of multi-directional Young's modulus, total stiffness, and the addition of isotropy constraints. The paper explores the characteristics and implications of this innovation, emphasizing the impact of geometric and topological variations on mechanical performance. These metamaterial sequences offer unparalleled adaptability, and hold significant potential in structural engineering and adaptive mechanical systems, opening avenues for technological advancements.
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