论文标题
关于粘弹性和波动的相互作用，以增强球体/平坦触点的拉力
On the interaction of viscoelasticity and waviness in enhancing the pull-off force in sphere/flat contacts
论文作者
论文摘要
由低模量材料中粗糙度诱导的粘附增强（加强和加强）的促进，我们研究了在接触边缘的粘弹性耗散存在下，从底物脱离了底物，并以单轴对称波动的形式进行粗糙度。我们表明，古杜鲁和同事在弹性情况下发现的粗糙度引起的增强（即，在很小的分离速度下）倾向于随着速度的增加而消失，在这种情况下，粘弹性效应占主导地位，而问题接近了光滑的球体。这与Guduru组与明胶的原始实验定性达成共识。交叉速度是两个单独效应相当的地方。粘弹性有效地湿透了粗糙度引起的弹性不稳定性，并使它们的影响不那么重要。
Motivated by roughness-induced adhesion enhancement (toughening and strengthening) in low modulus materials, we study the detachment of a sphere from a substrate in the presence of both viscoelastic dissipation at the contact edge, and roughness in the form of a single axisymmetric waviness. We show that the roughness-induced enhancement found by Guduru and coworkers for the elastic case (i.e. at very small detachment speeds) tends to disappear with increasing speeds, where the viscoelastic effect dominates and the problem approaches that of a smooth sphere. This is in qualitative agreement with the original experiments of Guduru's group with gelatin. The cross-over velocity is where the two separate effects are comparable. Viscoelasticity effectively damps roughness-induced elastic instabilities, and make their effects much less important.
