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Issue 9, 2018

Wrinkling patterns in soft shells

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Abstract

Curvature plays an important role in the morphological evolution of soft shells under stretch. Here, through a combination of experiment, theory and simulation, we investigate the behavior of a hemispherical soft shell subject to an increasing outward point force at its pole. In contrast to an inward point force inducing a polygonal pattern of buckling in the shell, we observe a four-stage morphological transition and symmetry breaking under an increasing outward point force. The shell undergoes axisymmetric deformation around its pole and then buckles into a non-axisymmetric shape with a number of shallow wrinkles emanating from the pole, followed by the emergence of crater-like deep crumples and ultimately a transformation into a wrinkled pseudocone. Our theoretical analysis and numerical simulations yield the critical conditions for the morphological transitions at each stage of deformation and reveal the underlying interplays between elastic bending and stretching energies and the curvature of the shell.

Graphical abstract: Wrinkling patterns in soft shells

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Article information


Submitted
16 Nov 2017
Accepted
30 Jan 2018
First published
30 Jan 2018

Soft Matter, 2018,14, 1681-1688
Article type
Paper

Wrinkling patterns in soft shells

C. Zhang, Y. Hao, B. Li, X. Feng and H. Gao, Soft Matter, 2018, 14, 1681 DOI: 10.1039/C7SM02261A

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