Journal
ENGINEERING STRUCTURES
Volume 210, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2020.110384
Keywords
2D chiral cellular structure; Elastic properties; Coupling effects; Theoretical analysis; Finite element analysis
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Funding
- National Natural Science Foundation of China [51605140]
- Fundamental Research Funds for the Central Universities [2018B15714, 2019B67314]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJKY19-0439]
- Natural Science Foundation of Jiangsu Province [BK20150802]
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A 2D chiral cellular structure, the unit cell of which is composed of four V-shaped wings, is studied through the energy-based method. The closed-form solutions of the in-plane elastic constants are obtained as functions of geometric parameters and verified through finite element analysis. Furthermore, the influences of geometric parameters on the elastic constants are discussed. Results show that the equivalent moduli of the structure can be several orders of magnitude lower than those of the base material, and the maximum global strains can be dozens of times those of the base material. Besides, the structure shows significant in-plane elastic coupling effects: (1) the maximum ratio of the shear to elastic strain beyond 17.2 degrees/% and (2) the maximum ratio of the elastic to shear strain exceeding 1.52%/degrees (x-direction) and 1.64%/degrees (y-direction). As a distinctive 2D chiral cellular structure, the structure shows great potential as a candidate selection for flexible structures in engineering applications.
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