Journal
SOFT MATTER
Volume 8, Issue 23, Pages 6291-6300Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2sm25278c
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Funding
- DARPA [W911NF-10-1-0113]
- National Science Foundation's Harvard MRSEC [DMR-0820484]
- REU
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820484] Funding Source: National Science Foundation
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Three dimensional curls (hemi-helices) consisting of multiple, periodic and alternating helical sections of opposite chiralities, separated by perversions, are one of a variety of complex shapes that can be produced by a simple generic process consisting of pre-straining one elastomeric strip, joining it side-by-side to another and then releasing the bi-strip. The initial wavelength of the hemi-helix and the number of perversions are determined by the strip cross-section, the constitutive behavior of the elastomer and the value of the pre-strain. The hemi-helix has no net twist. Topologically, the perversions separate regions of the hemi-helix deforming principally by bending from those where twisting dominates.
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