Bioinspired, Simulation‐Guided Design of Polyhedron Metamaterial for Simultaneously Efficient Heat Dissipation and Energy Absorption

Abstract

Light‐weight, high‐strength metamaterials with excellent heat dissipation and energy absorption capabilities are of great interest to aerospace and automobile applications. Particularly, innovative structure design and its successful realization are paramount but often challenging due to the vast design space and associated complex manufacturing. Herein, in this study, inspired by pomelo peel's superior shielding protection to the pulp, bionic polyhedron metamaterials (BPMs) that imitate the pomelo peel are designed and realized by metal 3D printing to achieve not only superior heat dissipation but also high energy absorption. Guided by experiments and numerical simulations, the BPM with circular struts possesses the highest Nusselt number, lowest pressure drop, and friction factor at Re = 7000–30000. Above results integrated lead to that the BPM with circular struts exhibit a higher thermal efficiency index that exceeds 1 at 0.92 porosity. Furthermore, the BPM with circular struts possesses moderate specific energy absorption in existing mechanical metamaterials for their corresponding density, which has potential for gas turbines and some cooling structures. The above findings will guide the design of metamaterials with high heat dissipation and energy absorption.

Low-frequency band gap design of acoustic metamaterial based on cochlear structure

“…Recently, the design of bionic materials has become a hot spot in metamaterial design. In order to adapt to the environment, organisms have evolved various unique structures, which provide many ideas for the design of metamaterials [30][31][32][33][34][35][36][37]. Inspired by bamboo and lotus root, Li et al proposed hexagonal, pentagonal, quadrilateral, and triangular multicellular structures to overcome the disadvantages of traditional thin-walled structures, such as excessive force drop after initial peak and large structural mass [38].…”

Deep Learning-Accelerated Designs of Tunable Magneto-Mechanical Metamaterials

“…Metamaterials are artificially structured materials with carefully designed geometries, demonstrating unusual behaviors and properties, such as negative Poisson's ratio, 1,2 acoustic band gap, 3,4 energy absorption, 5,6 and electromagnetic wave manipulation. 7,8 Although mechanical metamaterials possess promising potentials, their property is encoded and unchangeable once the material is fabricated.…”

“…Metamaterials are artificially structured materials with carefully designed geometries, demonstrating unusual behaviors and properties, such as negative Poisson’s ratio, , acoustic band gap, , energy absorption, , and electromagnetic wave manipulation. , Although mechanical metamaterials possess promising potentials, their property is encoded and unchangeable once the material is fabricated. Since metamaterial properties are mainly determined by their geometries, a direct way to enhance the tunability of the properties is to induce shape reconfiguration through deformation, such as buckling, by external mechanical loads. ,− Therefore, soft active materials are explored to construct active metamaterials as they are capable of providing large deformation upon external stimuli, including heat, − light, , and magnetic fields, , enabling contactless and advanced control.…”

Wave Propagation Properties of a Spider‐Web‐Like Hierarchical Acoustic Metamaterial

“…The researchers designed metamaterial structures based on bionic theory. [30][31][32][33][34][35][36][37] Inspired by the hierarchical structure of butterfly, Wu et al proposed and designed a novel lattice structure with second-order periodicity, and they found that lattices with hierarchical periodicity had lower bandgaps. [38] Miniaci et al first proposed the idea of taking inspiration from spider webs to build phononic crystals in 2016.…”