Viscous Control of Peeling an Elastic Sheet by Bending and Pulling
Viscous Control of Peeling an Elastic Sheet by Bending and Pulling
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DOI：
10.1103/physrevlett.111.154501
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发表时间：
2013-10-07
影响因子：
8.6
通讯作者：
Neufeld, Jerome A.
中科院分区：
文献类型：
--
作者：
Lister, John R.;Peng, Gunnar G.;Neufeld, Jerome A.
粘性流体在弹性片材下方的传播由剥离前的局部动力学控制，与前体膜上的液滴的毛细管驱动扩散非常相似。在这里，我们确定一个通用的弹性剥离问题的传播规律在不同的限制剥离弯曲和剥离拉，并将我们的研究结果的径向传播的流体泡在一个薄的预湿膜。对于相对于板厚度的小变形的情况，剥离由弯曲驱动，导致径向增长为t（7/22）。实验结果再现了传播行为和弯曲波在前面。对于相对于片材厚度的大变形，泡罩帽的拉伸和随后的张力可以通过弯曲或通过在前部拉动来驱动剥离，这两者都导致径向增长t（3/8）。在这一制度，详细的预测给出了极好的协议和解释以前的实验测量中的拉伸制度在弹性Hele-Shaw细胞的蔓延。
Propagation of a viscous fluid beneath an elastic sheet is controlled by local dynamics at the peeling front, in close analogy with the capillary-driven spreading of drops over a precursor film. Here we identify propagation laws for a generic elastic peeling problem in the distinct limits of peeling by bending and peeling by pulling, and apply our results to the radial spread of a fluid blister over a thin prewetting film. For the case of small deformations relative to the sheet thickness, peeling is driven by bending, leading to radial growth as t(7/22). Experimental results reproduce both the spreading behavior and the bending wave at the front. For large deformations relative to the sheet thickness, stretching of the blister cap and the consequent tension can drive peeling either by bending or by pulling at the front, both leading to radial growth as t(3/8). In this regime, detailed predictions give excellent agreement and explanation of previous experimental measurements of spread in the pulling regime in an elastic Hele-Shaw cell.