Spatially configuring wrinkle pattern and multi-scale surface evolution with structural confinement

Wang, Ding, Cheewaruangroj, Nontawit, Li, Yifan, McHale, Glen, Jiang, Yingzhu, Wood, David, Biggins, John Simeon and Xu, BEN (2017) Spatially configuring wrinkle pattern and multi-scale surface evolution with structural confinement. Advanced Functional Materials. ISSN 1616-3028 (In Press)

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Official URL: http://dx.doi.org/10.1002/adfm.201704228

Abstract

Surface elastic instabilities, such as wrinkling and creasing, could enable a convenient strategy to impart reversible patterned topography to a surface. Here we focus on the classic system of a stiff layer on a soft substrate, which famously produces parallel harmonic wrinkles at modest uniaxial compression that period-double repeatedly at higher compressions and ultimately evolve into deep folds and creases. By introducing micron-scale planar Bravais lattice holes to spatially pattern the substrate, we can guide these instabilities into a wide variety of different patterns, including wrinkling in parallel bands and star shape bands, and radically reduce the threshold compression. We are able to understand our experimental patterns and thresholds by considering a simple plane-strain model for the patterned substrate-deformation, decorated by wrinkling on the stiff surface layer. Our experiments also show localized wrinkle-crease transitions at modest compression, yielding a hierarchical surface with different generations of instability mixed together. By varying the geometrical inputs, we demonstrate control over the stepwise evolution of surface morphologies. These results demonstrate considerable control over both the patterns and threshold of the surface elastic instabilities, and have relevance to many emerging applications of morphing surfaces, including in wearable/flexible electronics, bio-medical systems and optical devices.

Item Type: Article
Subjects: F200 Materials Science
H300 Mechanical Engineering
J400 Polymers and Textiles
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Bin Xu
Date Deposited: 02 Oct 2017 14:17
Last Modified: 04 Oct 2017 06:59
URI: http://nrl.northumbria.ac.uk/id/eprint/32195

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