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Cascade unlooping of a low-pitch helical spring under tension | | E.L. Starostin
; G.H.M. van der Heijden
; | | Date: |
9 Dec 2008 | | Abstract: | We study the force vs extension behaviour of a helical spring made of a thin
torsionally-stiff anisotropic elastic rod. Our focus is on springs of very low
helical pitch. For certain parameters of the problem such a spring is found not
to unwind when pulled but rather to form hockles that pop-out one by one and
lead to a highly non-monotonic force-extension curve. Between abrupt loop
pop-outs this curve is well described by the planar elastica whose relevant
solutions are classified. Our results may be relevant for tightly coiled
nanosprings in future micro- and nano(electro)mechanical devices. | | Source: | arXiv, 0812.1805 | | Services: | Forum | Review | PDF | Favorites | |
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