Novel triangular auxetic honeycombs with enhanced stiffness

被引：65

作者：

Nedoushan, Reza Jafari ^{[1
]}

An, Yongsan ^{[2
,3
]}

Yu, Woong-Ryeol ^{[2
,3
]}

Abghary, Mohammad Javad ^{[4
]}

机构：

[1] Isfahan Univ Technol, Dept Mech Engn, Esfahan 8415683111, Iran

[2] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 08826, South Korea

[3] Seoul Natl Univ, Res Inst Adv Mat, Seoul 08826, South Korea

[4] Yazd Univ, Dept Text Engn, Yazd 89195741, Iran

来源：

COMPOSITE STRUCTURES | 2021年 / 277卷

基金：

新加坡国家研究基金会;

关键词：

Auxetic structures; Enhanced stiffness; Isotropic behavior; NegativePoisson's ratio; Triangular truss; 3D printing; INPLANE STIFFNESS; COMPOSITE; BEHAVIOR; STENT;

D O I：

10.1016/j.compstruct.2021.114605

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Cellular auxetic materials possess a negative Poisson's ratio (NPR) and attractive mechanical properties; however, these materials are limited by their low stiffness and strength and strong anisotropy. To address these issues, we developed a novel auxetic honeycomb with a fully triangular architecture inspired by the anti-tetra chiral configuration. The new stretch-dominant structure was fabricated using a three-dimensional printing process. The resulting deformation behavior of the triangular auxetic honeycomb structure was compared with that predicted from finite element (FE) simulations; these revealed an NPR and high stiffness, in which the ratio of specific stiffness to specific density was 0.12. The simulations allowed for an NPR in both the longitudinal and transverse directions concurrently. Based on the mechanism revealed by the FE simulations, the novel triangular honeycomb can be tuned to have the same behavior in two orthogonal directions, while retaining high stiffness and an NPR.

引用

页数：10

共 36 条

[1] The crashworthiness performance of thin-walled ultralight braided lattice composite columns: Experimental and finite element study [J].