Pinning-Induced Folding-Unfolding Asymmetry in Adhesive Creases.

  title={Pinning-Induced Folding-Unfolding Asymmetry in Adhesive Creases.},
  author={Michiel A. J. van Limbeek and Martin H. Essink and Anupam Pandey and Jacco H. Snoeijer and Stefan Karpitschka},
  journal={Physical review letters},
  volume={127 2},
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… Expand
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