Pinning-Induced Folding-Unfolding Asymmetry in Adhesive Creases

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2021
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Zusammenfassung

The compression of soft elastic matter and biological tissue can lead to creasing, an instability where a surface folds sharply into periodic self-contacts. Intriguingly, the unfolding of the surface upon releasing the strain is usually not perfect: small scars remain that serve as nuclei for creases during repeated compressions. Here we present creasing experiments with sticky polymer surfaces, using confocal microscopy, which resolve the contact line region where folding and unfolding occurs. It is found that surface tension induces a second fold, at the edge of the self-contact, which leads to a singular elastic stress and self-similar crease morphologies. However, these profiles exhibit an intrinsic folding-unfolding asymmetry that is caused by contact line pinning, in a way that resembles wetting of liquids on imperfect solids. Contact line pinning is therefore a key element of creasing: it inhibits complete unfolding and gives soft surfaces a folding memory.

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Fachgebiet (DDC)
530 Physik
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Polymers & Soft Matter, Wetting, Elastic deformation, Creasing, Adhesion
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ISO 690VAN LIMBEEK, Michiel A. J., Martin H. ESSINK, Anupam PANDEY, Jacco H. SNOEIJER, Stefan KARPITSCHKA, 2021. Pinning-Induced Folding-Unfolding Asymmetry in Adhesive Creases. In: Physical Review Letters. American Physical Society (APS). 2021, 127(2), 028001. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/physrevlett.127.028001
BibTex
@article{vanLimbeek2021Pinni-67443,
  year={2021},
  doi={10.1103/physrevlett.127.028001},
  title={Pinning-Induced Folding-Unfolding Asymmetry in Adhesive Creases},
  number={2},
  volume={127},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={van Limbeek, Michiel A. J. and Essink, Martin H. and Pandey, Anupam and Snoeijer, Jacco H. and Karpitschka, Stefan},
  note={Article Number: 028001}
}
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