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Article Dans Une Revue Extreme Mechanics Letters Année : 2020

Optimal isotropic, reusable truss lattice material with near-zero Poisson’s ratio

Résumé

Cork is a natural amorphous material with near-zero Poisson’s ratio that is ubiquitously used for sealing glass bottles. It is an anisotropic, transversally isotropic, composite that can hardly be scaled down. Here, we propose a new class of isotropic and reusable cork-like metamaterial that is designed from a hybrid truss-lattice material to show an isotropic Poisson’s ratio close to zero. Optimization is conducted using a multi-objective genetic algorithm, assisted by an elliptical basis function neural network, and coupled with finite element simulations. The optimal micro-structured metamaterial, fabricated by two-photon lithography with a lattice constant of 300 µm has an almost isotropic Poisson’s ratio smaller than 0.08 in all directions. It can recover 96.6% of its original shape after a compressional test exceeding 20% strain.
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Dates et versions

hal-03053066 , version 1 (10-12-2020)

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Xueyan Chen, Johnny Moughames, Qingxiang Ji, Julio Andrés Iglesias Martinez, Huifeng Tan, et al.. Optimal isotropic, reusable truss lattice material with near-zero Poisson’s ratio. Extreme Mechanics Letters, 2020, 41, pp.101048. ⟨10.1016/j.eml.2020.101048⟩. ⟨hal-03053066⟩
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