Dear All

        Professor Benny Davidovitch from University of Massachusetts  (Amherst) will visit our labs next Tuesday. The same day he will give a seminar in the Physics Department at 12:50  (USACH, seminar room 3rd floor) about the wrinkling of polymer flms near a free boundary (see abstract). 

Best regards, Enrique.

(Pictures courtesy of J. Huang and N.Menon)

Abstract: Thin elastic bodies, such as paper sheets or human skin, tend to
buckle or to wrinkle when small compressive forces are exerted on their
boundaries. This familiar phenomenon is known as Euler buckling. In this talk I
will discuss situations in which tensile and compressive forces are exerted
simultaneously, in a way that breaks translational symmetry along both principle
directions of the membrane. I will present a theory that predicts a multitude of
novel morphological phases in various regimes of a 2-dimensional parameter
space, defined by the relevant mechanical and geometrical conditions. The
parameters are, respectively, the ratio between compression and tension, and the
wavelength contrast along the tension direction. In particular, the theory
associates the repetitive period fissioining pattern, recently observed on
wrinkled membranes floating on liquid and subject to capillary forces (J. Huang
et al.) to the characteristic morphology when tension is dominant and the
wavelength contrast is large.
 

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