title: Surface wrinkling patterns on a core-shell soft sphere.
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.
authors.affiliation: Center for Nano and Micro Mechanics & Institute of Biomechanics and Medical Engineering, Department of Engineering Mechanics, Tsinghua University, Beijing, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.forename: Fei
authors.initials: F
authors.lastname: Jia
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Cao
authors.forename: Xi-Qiao
authors.initials: XQ
authors.lastname: Feng
authors.forename: Huajian
authors.initials: H
authors.lastname: Gao