Journal
COMPOSITE STRUCTURES
Volume 282, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2021.115043
Keywords
Auxetic lattices; Negative Poisson's ratio; Stiffness; Energy absorption; Chiral; Composites
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Funding
- National Natural Science Foundation of China [51978330, 51778283]
- National Natural Science Foundation for the Youth of China [51808286]
- Natural Science Foundation of Jiangsu Province [BK20180710]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_1009]
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This paper investigates a new method to enhance the mechanical properties of auxetic composites by designing joints of frames. Through experiments and numerical analysis, optimizing the design of joints can improve energy absorption capacity and auxetic behavior.
Auxetic materials and structures have many potential applications due to their counter-intuitive deformation behavior and desirable mechanical properties. However, auxetic structures have some drawbacks, such as relatively low stiffness and stability. To improve their mechanical performance, one common method is to fill soft materials in auxetic frames, i.e., auxetic two-phase composites. In this paper, a novel method to further enhance the mechanical properties of auxetic composites has been proposed, which is implemented by designing joints of frames. Mechanical properties and deformation characteristics of these novel composites and their conventional counterparts are investigated experimentally and numerically. The results of finite element analysis and experiments exhibit a good agreement. The energy absorption capacity and auxeticity of the proposed composites could be enhanced by optimizing the design of joints. Subsequently, parametrical studies are conducted to quantify the effects of the geometrical parameters and the volume fraction of the frame.
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