Critical Confinement and Elastic Instability in Thin Solid Films

When a flexible plate is peeled off a thin and soft elastic film bonded to a rigid sup-port, uniformly spaced fingering patterns develop along their line of contact. Although the wavelength of these patterns depends only on the thickness of the film, their amplitude varies with all material and geometric properties of the film and that of the adhering plate. Here we have analyzed this instability by the reg-ular perturbation technique to obtain the excess deformations of the film over and above the base quantities. Furthermore, by calculating the excess energy of the sys-tem, we have shown that these excess deformations, associated with the instability, occur for films that are critically confined. We have presented two different experi-ments for controlling the degree of confinement: by prestretching the film and by adjusting the contact width between the film and the plate