Elastic response and wrinkling onset of curved elastic membranes subjected to indentation test |
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Authors: | R Bernal Ch Tassius F Melo J -Ch Géminard |
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Institution: | (1) Energid Systems, Cambridge, USA;(2) Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, 110, 8th Street, Troy, NY 12180, USA;(3) Department of Surgery, Albany Medical College, Albany, USA;(4) Department of Surgery, Beth Israel Deaconess Medical Center, Boston, USA; |
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Abstract: | Starting from a polymeric-fluid droplet, by vulcanization of the fluid free surface, curved elastic membranes, several nanometers
thick and a few millimeters in diameter, which enclose a constant fluid volume, are produced. In an indentation-type test,
carried out by pushing the membrane along its normal by means of a micro-needle, under some conditions, wrinkles are likely
to appear around the contact region. Interestingly, we observe that the instability does not significantly alter the force-displacement
relation: the relation between the force and the displacement remains linear and the associated stiffness is simply proportional
to the tension of the membrane. In addition, we determine that the wrinkles develop when the stretching modulus of the membrane
compares with its tension, which provides a useful method to estimate the elastic constant. |
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