Journal
PHYSICAL REVIEW LETTERS
Volume 112, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.068103
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Funding
- National Science Foundation [CMMI-1129894]
- Schlumberger
- MIT-France Program
- Battelle-MIT postdoctoral fellowship
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1129894] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [1004083] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [25800174, 23681032, 25709057, 11J06478, 25103505, 23340109, 23540376, 22102003] Funding Source: KAKEN
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We investigate how natural curvature affects the configuration of a thin elastic rod suspended under its own weight, as when a single strand of hair hangs under gravity. We combine precision desktop experiments, numerics, and theoretical analysis to explore the equilibrium shapes set by the coupled effects of elasticity, natural curvature, nonlinear geometry, and gravity. A phase diagram is constructed in terms of the control parameters of the system, namely the dimensionless curvature and weight, where we identify three distinct regions: planar curls, localized helices, and global helices. We analyze the stability of planar configurations, and describe the localization of helical patterns for long rods, near their free end. The observed shapes and their associated phase boundaries are then rationalized based on the underlying physical ingredients.
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