Pinning-Induced Folding-Unfolding Asymmetry in Adhesive Creases
| Autor: | Jacco H. Snoeijer, Martin H. Essink, Michiel A. J. van Limbeek, Stefan Karpitschka, Anupam Pandey |
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| Přispěvatelé: | Physics of Fluids, MESA+ Institute |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Microscopy Confocal Condensed matter physics Polymers media_common.quotation_subject General Physics and Astronomy FOS: Physical sciences Condensed Matter - Soft Condensed Matter Asymmetry Instability Elasticity Surface tension Stress (mechanics) Folding (chemistry) Models Chemical Elastic Modulus Soft Condensed Matter (cond-mat.soft) Surface Tension Compression (geology) Wetting Elastic modulus media_common |
| Zdroj: | Physical review letters, 127(2):028001. American Physical Society |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | 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. Comment: 8 pages, 6 figures |
| Databáze: | OpenAIRE |
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