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FROM:
Shengqiang Cai (1), Dayong Chen (2), Zhigang Suo (1) and Ryan C. Hayward (2)
(1) School of Engineering and Applied Sciences, Kavli Institute, Harvard University, Cambridge, MA, 02138, USA
(2) Department of Polymer Science & Engineering, University of Massachusetts, Amherst, MA, 01003, USA
“Creasing instability of elastomer films”, Soft Matter, Vol. 8, pp1301-1304, 2012, DOI: 10.1039/c2sm06844c
ABSTRACT: The creasing instability of elastomer films under compression is studied by a combination of experiment and numerical simulation. Experimentally, we attach a stress-free film on a much thicker and stiffer pre-stretched substrate. When the substrate is partially released, the film is uniaxially compressed, leading to formation of an array of creases beyond a critical strain. The profile of the folded surface is extracted using confocal fluorescence microscopy, yielding the depths, spacings, and shapes of creases. Numerically, the onset and development of creases are simulated by introducing appropriately sized defects into a finite-element mesh and allowing the surface of the film to self-contact. The measurements and simulations are found to be in excellent agreement.
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