期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 206, 期 -, 页码 170-182出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2020.09.003
关键词
Auxetic; Negative Poisson's ratio; High stiffness; Controllable anisotropy; Isotropic
类别
资金
- National Science Foundation of China [12072091]
- National Natural Science Foundation of Heilongjiang Province [YQ2019A003]
- Program for Outstanding Young Scholars in Harbin Institute of Technology
- Science and Technology on Advanced Composites in Special Environment Laboratory
- Young Elite Scientist Sponsorship Program by CAST [YESS20160190]
Critical drawback of poor stiffness in traditional auxetic materials limits them to be applied where negative Poisson's ratio behavior and excellent load-bearing capacity are simultaneously desired. In this work, a general prescription for designing auxetic lattice structures with high stiffness and controllable isotropic/anisotropic elastic properties is proposed. Based on it, we rationally design a class of novel auxetic lattice structures whose deformation is mainly governed by the stretching mechanisms and conducted an investigation on a tree-like re-entrant structure. A combination of theoretical predictions, numerical simulations and tensile test experiments have been carried out to gain a comprehensive understanding of the structural in-plane elastic mechanical properties along both the principal axes as well as in the off-axis directions. Besides, theoretical model for designing tree-like re-entrant structure with isotropic elastic properties is established and experimentally verified with specimens fabricated with CFRP composite. The results of this research has proven the tree-like re-entrant structure exhibits excellent effective Young's modulus, shear modulus and obvious negative Poisson's ratio effect along omni-direction. Investigation on the directional dependence of structural effective elastic properties has further indicated the proposed structure presents a great potential for designing auxetic material with controllable anisotropic elastic properties. In particular, the proposed structure is capable in achieving isotropic design with any negative Poisson's ratio between -1 and 0. The design philosophy presented in this paper provides a general prescription for solving the challenge of poor stiffness in traditional auxetic materials and paves a new way for isotropic auxetic design. (C) 2020 Elsevier Ltd. All rights reserved.
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