期刊
MECHANICS OF MATERIALS
卷 160, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mechmat.2021.103926
关键词
Viscoelasticity; Adhesion; Surface roughness; Energy release rate
资金
- project FASTire (Foam Airless Spoked Tire): Smartsimilar toAirless Tyres for Extremely-Low Rolling Resistance and Superior Passengers Comfort - Italian MIUR Progetti di Ricerca di Rilevante Interesse Nazionale (PRIN) [2017948FEN]
In this study, dissipative effects during the detachment of a smooth spherical glass probe from a viscoelastic silicone substrate patterned with micro-asperities were investigated using experiments and modeling. The results show that scaling laws for contact radius and contact line velocity can be established through pull-off experiments on substrates with different height distributions of micro-asperities.
In this work, we investigate dissipative effects involved during the detachment of a smooth spherical glass probe from a viscoelastic silicone substrate patterned with micro-asperities. As a baseline, the pull-off of a single asperity, millimeter-sized contact between a glass lens and a smooth poly(dimethylsiloxane) (PDMS) rubber is first investigated as a function of the imposed detachment velocity. From a measurement of the contact radius a(t) and normal load during unloading phase, the dependence of the strain energy release rate G on the velocity of the contact line upsilon(c) = da/dt is determined under the assumption that viscoelastic dissipation is localized at the edge of the contact. These data are incorporated into Muller's model (Muller, 1999) in order to predict the time-dependence of the contact size. Similar pull-off experiments are carried out with the same PDMS substrate patterned with spherical micro-asperities with a prescribed height distribution. From in situ optical measurements of the micro-contacts, scaling laws are identified for the contact radius.. and the contact line velocity upsilon(c) On the basis of the observed similarity between macro and microscale contacts, a numerical solution is developed to predict the reduction of the contact radius during unloading.
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