钉扎诱导的粘合折痕折叠-展开不对称性
Pinning-induced folding-unfolding asymmetry in adhesive creases
摘要：
软弹性物质和生物组织的压缩可导致褶皱，这是一种表面急剧折叠成周期性自接触的不稳定性。有趣的是，释放张力后表面的展开通常并不完美：在反复挤压期间，小疤痕仍然作为折痕的核。在这里，我们提出折痕实验粘性聚合物表面，使用共聚焦显微镜，解决折叠和展开发生的接触线区域。研究发现，表面张力在自接触的边缘产生第二次折叠，导致奇异的弹性应力和自相似的折痕形貌。然而，这些配置文件表现出内在的折叠展开的不对称性，这是由接触线钉扎，在某种程度上，类似于不完美的固体上的液体润湿。因此，接触线钉扎是折痕的关键要素：它抑制完全展开并赋予柔软表面折叠记忆。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
