Bi-material microstructural design of chiral auxetic metamaterials using topology optimization

This paper presents a new bi-material microstructural design method for chiral auxetic metamaterials. Based on the independent point-wise density interpolation (iPDI) and a bi-material model, optimal design problem of periodic unit cells is formulated using nodal density variables. The design object...

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Vydané v:Composite structures Ročník 195; s. 232 - 248
Hlavní autori: Zhang, Huikai, Luo, Yangjun, Kang, Zhan
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Elsevier Ltd 01.07.2018
Predmet:
Bi-material microstructure
Chiral auxetic metamaterial
Independent point-wise interpolation
Mechanical metamaterial
Topology optimization
Topology optimization
Independent point-wise interpolation
Chiral auxetic metamaterial
Bi-material microstructure
Mechanical metamaterial
ISSN:0263-8223, 1879-1085
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Popis
Shrnutí:This paper presents a new bi-material microstructural design method for chiral auxetic metamaterials. Based on the independent point-wise density interpolation (iPDI) and a bi-material model, optimal design problem of periodic unit cells is formulated using nodal density variables. The design objective is to minimize the Poisson’s ratio while satisfying the specified volume constraints of the hard and soft materials, and the effective elastic properties of the bi-material microstructure are computed by the asymptotic homogenization method under periodic boundary conditions. This topology optimization problem is solved with a gradient-based mathematical programming algorithm on the basis of the sensitivity analysis. Several numerical examples, regarding design of anisotropic, orthogonal anisotropic and isotropic bi-material microstructures of chiral auxetic metamaterials, are given to demonstrate the effectiveness of the method. It is shown that the proposed bi-material design optimization method can be used to improve the performance of chiral auxetic metamaterials through enlarging the design space.
ISSN:0263-8223
1879-1085
DOI:10.1016/j.compstruct.2018.04.058