Journal
JOURNAL OF APPLIED PHYSICS
Volume 108, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3465378
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Funding
- Engineering and Physical Sciences Research Council [EP/F048394/1]
- Engineering and Physical Sciences Research Council [EP/F048394/1] Funding Source: researchfish
- Medical Research Council [G0902241] Funding Source: researchfish
- EPSRC [EP/F048394/1] Funding Source: UKRI
- MRC [G0902241] Funding Source: UKRI
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This paper discusses a helical auxetic structure which has a diverse range of practical applications. The mechanical properties of the system can be determined by particular combinations of geometry and component material properties; finite element analysis is used to investigate the static behavior of these structures under tension. Modeling criteria are determined and design issues are discussed. A description of the different strain-dependent mechanical phases is provided. It is shown that the stiffnesses of the component fibers and the initial helical wrap angle are critical design parameters, and that strain-dependent changes in cross-section must be taken into consideration: we observe that the structures exhibit nonlinear behavior due to nonzero component Poisson's ratios. Negative Poisson's ratios for the helical structures as low as -5 are shown. While we focus here on the structure as a yarn our findings are, in principle, scaleable. (C) 2010 American Institute of Physics. [doi:10.1063/1.3465378]
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