Peeling from a patterned thin elastic film

Details Peeling from a patterned thin elastic film Peeling from a patterned thin elastic film

2004-04-29

arxiv.org/abs/cond-mat/0404719v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, To appear in Proceedings of Royal Society London, Ser. A

Scientific paper

10.1098/rspa.2004.1313

Inspired by the observation that many naturally occurring adhesives arise as textured thin films, we consider the displacement controlled peeling of a flexible plate from an incision-patterned thin adhesive elastic layer. We find that crack initiation from an incision on the film occurs at a load much higher than that required to propagate it on a smooth adhesive surface; multiple incisions thus cause the crack to propagate intermittently. Microscopically, this mode of crack initiation and propagation in geometrically confined thin adhesive films is related to the nucleation of cavitation bubbles behind the incision which must grow and coalesce before a viable crack propagates. Our theoretical analysis allows us to rationalize these experimental observations qualitatively and quantitatively and suggests a simple design criterion for increasing the interfacial fracture toughness of adhesive films.

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