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FROM:
Monica M. Ripp (1,2), Vincent Demery (3,4), Teng Zhang (2,5) and Joseph D. Paulsen (1,2)
(1) Department of Physics, Syracuse University, Syracuse, NY 13244, USA
(2) BioInspired Syracuse: Institute for Material and Living Systems, Syracuse University, Syracuse, NY 13244, USA
(3) Gulliver, CNRS, ESPCI Paris, PSL Research University, 10 rue Vauquelin, 75005 Paris, France
(4) Univ Lyon, ENS de Lyon, Univ Claude Bernard Lyon 1, CNRS, Laboratoire de Physique, F-69342 Lyon, France
(5) Department of Mechanical and Aerospace Engineering, Syracuse University, Syracuse, NY 13244, USA
“Geometry underlies the mechanical stiffening and softening of an indented floating film”, Soft Matter, Vol. 16, No. 17, pp 4121-4130, 7 May 2020, https://doi.org/10.1039/D0SM00250J
ABSTRACT: A basic paradigm underlying the Hookean mechanics of amorphous, isotropic solids is that small deformations are proportional to the magnitude of external forces. However, slender bodies may undergo large deformations even under minute forces, leading to nonlinear responses rooted in purely geometric effects. Here we study the indentation of a polymer film on a liquid bath. Our experiments and simulations support a recently-predicted stiffening response [D. Vella and B. Davidovitch, Phys. Rev. E, 2018, 98, 013003], and we show that the system softens at large slopes, in agreement with our theory that addresses small and large deflections. We show how stiffening and softening emanate from nontrivial yet generic features of the stress and displacement fields.
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