液体泡罩测试
The Liquid Blister Test
摘要：
我们考虑一个薄的弹性片粘附到一个刚性基板的表面张力的薄液体层的手段。剥离是通过在板的中心施加垂直位移开始的，并导致形成分层区域或“气泡”。该实验表明，根据所施加的垂直位移，泡罩的周长采取三种不同形式之一。随着位移的增加，我们首先观察到圆形水泡，然后是波浪形水泡，最后是三角形水泡。我们得到的理论预测，这三个家庭的水泡观察到的功能。该理论建立在弹性薄板的Föppl-von Kármán方程基础上，并考虑了液体的表面能。我们发现我们的理论预测和实验结果之间有很好的定量一致性，这表明所有三个家庭是由弹性和毛细作用力之间的不同平衡。我们的研究结果可能会影响到微米锥形设备和其他系统的弹性和粘附力的竞争。
英文摘要：
We consider a thin elastic sheet adhering to a stiff substrate by means of the surface tension of a thin liquid layer. Debonding is initiated by imposing a vertical displacement at the centre of the sheet and leads to the formation of a delaminated region, or `blister'. This experiment reveals that the perimeter of the blister takes one of three different forms depending on the vertical displacement imposed. As this displacement is increased, we observe first circular, then undulating and finally triangular blisters. We obtain theoretical predictions for the observed features of each of these three families of blisters. The theory is built upon the Föppl-von Kármán equations for thin elastic plates and accounts for the surface energy of the liquid. We find good quantitative agreement between our theoretical predictions and experimental results, demonstrating that all three families are governed by different balances between elastic and capillary forces. Our results may bear on micrometric tapered devices and other systems where elastic and adhesive forces are in competition.
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