Transient adhesion in a non-fully detached contact

Abstract

Continuous approaching and detaching displacement usually occurs in an adhesion test. Here, we found a transient adhesion force at the end of a non-fully detached contact. This force occurred when the nominal detaching displacement was less than the traditional quasi-static theory predicted zero force point. The transient adhesion force was ascribed to interfacial adhesion hysteresis, which was caused by the cracking process of the contact and the deformation competition between the sphere and supporting spring. Results indicated that the testing of adhesion can be significantly affected by different combinations of stiffnesses of the contact objects and the supporting spring cantilever. This combination should be carefully designed in an adhesion test. All these results enabled increased understanding of the nature of adhesion and can guide the design of adhesive actuators.

Adhesion Between Rigid Indenter and Soft Rubber Layer: Influence of Roughness

“…Due to the importance of rough contacts for industry and daily life, there are many works done by different scientific groups with investigations of the particularities of contact between rough surfaces in the presence of adhesion. There are different experiments (Benz et al, 2006;Tiwari et al, 2017;Liu et al, 2018;Sahli et al, 2019), theories (Johnson, 1995;Persson, 2006;Persson and Scaraggi, 2014;Ciavarella, 2015;Papangelo et al, 2019), as well as computer simulations (Pastewka and Robbins, 2014;Rey et al, 2017;Li et al, 2019). A short historical review of the development of adhesion theories can be found in Popova and Popov (2018).…”

Mechanics of adhesive contacts: Experiment and theory

“…From figure it follows, that minimum F significantly increased for last three values of the velocity. This effect is due to viscoelasticity of rubber layer [8]. At big values of velocity, we observe bigger values of normal forces during detachment of indenter; for indenters with bigger radii this effect becomes more pronounced.…”

Гистерезис В Адгезионном Контакте При Изменении Направления Сдвига: Эксперимент И Феноменологическая Модель

“…Многочисленные эксперименты показывают, что в фазе индентирования γ eff принимает существенно меньшее значение, чем при отрыве. В результате это и приводит к наблюдаемому гистерезису [25,30,32,35]. Причина, приводящая к различным значениям эффективной поверхностной энергии, до сих пор не выяснена.…”