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Peeling/Skinning : the frustrating pinch-off
When trying to peel off an adhesive film or skinning a fruit, the film often tears and pinches-off.
We only get a finite-size pointy strip.
Why this finite time singularity ? The answer is in the fold joining the
two cracks. [see our article]
Collaboration with E.Hamm et E.Cerda (USACH, Chili) and P.M.Reis (MIT)
Oscillating crack
in brittle thin sheet.
Trying to "cut" a thin sheet with a big object (with
respect to the sheet's thickness) results in a surprisingly regular
wavy cut.
This wake is the results of coupling fracture propagation with large
out-of-plane displacement of the sheet. The origin of this robust
phenomenon lies in the geometry of possible
buckling of the sheet.
Work in progress with B.Audoly
(LMM) and P.M.Reis