Tribology Letters ( IF 2.9 ) Pub Date : 2021-08-28 , DOI: 10.1007/s11249-021-01488-w Michele Ciavarella 1, 2 , Antonio Papangelo 1, 2
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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 makes their effects much less important.
Graphical Abstract
中文翻译：
关于粘弹性和波纹度在增强球面/平面接触中的拉断力方面的相互作用
受低模量材料中粗糙度引起的粘附增强（增韧和强化）的推动，我们研究了在接触边缘存在粘弹性耗散和单个轴对称波纹形式的粗糙度的情况下球体与基材的分离。我们表明，Guduru 和他的同事在弹性情况下（即在非常小的脱离速度下）发现的粗糙度引起的增强趋于随着速度的增加而消失，其中粘弹性效应占主导地位，问题接近光滑球体的问题。这与 Guduru 小组用明胶的原始实验定性一致。交叉速度是两个单独的效果具有可比性的地方。粘弹性有效地抑制了粗糙度引起的弹性不稳定性，并使它们的影响变得不那么重要。
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