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- W2964125909 abstract "One cannot pull an open, curved string along itself. This fact is clearly reflected in the unwrapping motion of a string or chain as it is dragged around an object, and implies strong consequences for slender structures in passive locomotion, whether industrial cables and sheets or the ribbons of rhythmic gymnastics. We address a basic problem in the dynamics of flexible bodies, namely the solution of the string equations with a free boundary. This system is the backbone of many fluid-structure interactions, and also a model problem for thin structures where geometric nonlinearities cannot be ignored. We consider planar dynamics under the restriction that the spatially-dependent stress profile in the string is time-independent, which results in a conservation law form for the equations. We find a new exact solution whose range of validity is time-dependent, limited to greater than a distance scaling as $t^{frac4/3}$ from the free end. The remainder of the distance is covered by splicing to another exact solution for a straight string, which introduces an error into the combined solution. The splicing also implies a $t^{-frac2/3}$ singularity in acceleration, apparently corresponding to a whipping motion of the vanishing straight segment." @default.
- W2964125909 created "2019-07-30" @default.
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- W2964125909 date "2012-11-20" @default.
- W2964125909 modified "2023-09-26" @default.
- W2964125909 title "At the end of a moving string" @default.
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