Is there more than one stickiness criterion?
作者机构：Department of Material Science and EngineeringSaarland UniversitySaarbrücken66123Germany INM—Leibniz Institute for New MaterialsSaarbrücken66123Germany
出 版 物：《Friction》 (摩擦（英文版）)
年 卷 期：2023年第11卷第6期
页 面：1027-1039页
核心收录：
学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程]
基 金：Deutsche Forschungsgemeinschaft (DFG) [MU 1694/5-2]
主 题：adhesion pull-off force rough contact stickiness
摘 要：Adhesion between an elastic body and a smooth,rigid substrate can lead to large tensile stresses between ***,most macroscopic objects are microscopically rough,which strongly suppresses adhesion.A fierce debate has unfolded recently as to whether local or global parameters determine the crossover between small and large ***,we report simulations revealing that the dependence of the pull-off force Fn on the surface energyγdoes not only have two regimes of high and low adhesion but up to four *** are related to contacts,which at the moment of rupture consist of(i)the last individual Hertzian-shaped contact,in which is linear inγ,(ii)a last meso-scale,individual patches with super-linear scaling,(iii)many isolated contact patches with extremely strong scaling,and(iv)a dominating largest contact patch,for which the pull-off stress is no longer negligible compared to the maximum,microscopic pull-off ***(iii)can be seen as a transition *** is located near the point where the surface energy is half the elastic energy per unit area in conformal contact.A criterion for the transition between regimes(i)and(ii)appears difficult to grasp.
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