期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 64, 期 -, 页码 351-366出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2013.11.014
关键词
Elasticity; Microscopic instability; Macroscopic instability; Porous structures
资金
- Harvard MRSEC [DMR-0820484]
- NSF [CMMI-1149456 (CAREER)]
- Wyss Institute through the Seed Grant Program
- Harvard School of Engineering and Applied Sciences at Harvard University
By introducing a periodic array of pores in an elastic matrix, instabilities with wavelengths that are of the order of the size of the microstructure can be triggered. Interestingly, these instabilities can be utilized to design a novel class of responsive materials. Possible applications include materials with unusual properties such as negative Poisson's ratio, phononic and photonic switches and colorful and reconfigurable displays. Although shape plays an important role in the design and performance of periodic materials, so far only the non-linear response of structures with circular and elliptical pores has been investigated and the effect of the pore shape on the structural response has not yet been explored. Here, we numerically explore the effect of pore shape on the non-linear response of a square array of pores in an elastomeric matrix. Our results show that pore shape can be used effectively to design material with desired properties and to control attractive features of soft porous systems, such as their stiffness, critical strain and negative Poisson's ratio. (C) 2013 Elsevier Ltd. All rights reserved.
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