Wrinkling and folding of a thin film bonded to a soft spherical core during uniform shrinking of the film-core system

This and the next image are from:

Bo Li (1), Fei Jia (1), Yan-Ping Cao (1), Xi-Qiao Feng (1) and Huajian Gao (2)
(1) Center for Nano and Micro Mechanics & Institute of Biomechanics and Medical Engineering, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
(2) School of Engineering, Brown University, Providence, Rhode Island 02912, USA

“Surface Wrinkling Patterns on a Core-Shell Soft Sphere”, Phys. Rev. Lett. 106, No. 23, 234301 (2011) [4 pages],
doi: 10.1103/PhysRevLett.106.234301

ABSTRACT: The three-dimensional patterns of surface wrinkling on a core-shell soft sphere are investigated through buckling and postbuckling analyses under differential tissue growth or shrinkage. With increasing deformation, the sphere first exhibits a buckyball-like wrinkling pattern and then undergoes a wrinkle-to-fold transition into labyrinth folded patterns, in agreement with experimental observations. This transition involves dynamic movement, rotation, and coalescence of polygons formed during the initial buckling.

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