Tricarico, MicheleMicheleTricaricoCiavarella, MicheleMicheleCiavarellaPapangelo, AntonioAntonioPapangelo2025-01-282025-01-282025-01-07Journal of the Mechanics and Physics of Solids 196: 106020 (2025)https://tore.tuhh.de/handle/11420/53467High-frequency micrometrical vibrations have been shown to greatly influence the adhesive performance of soft interfaces, however a detailed comparison between theoretical predictions and experimental results is still missing. Here, the problem of a rigid spherical indenter, hung on a soft spring, that is unloaded from an adhesive viscoelastic vibrating substrate is considered. The experimental tests were performed by unloading a borosilicate glass lens from a soft PDMS substrate excited by high-frequency micrometrical vibrations. We show that as soon as the vibration starts, the contact area increases abruptly and during unloading it decreases following approximately the JKR classical model, but with a much increased work of adhesion with respect to its thermodynamic value. We find that the pull-off force increases with the amplitude of vibration up to a certain saturation level, which appeared to be frequency dependent. Under the hypothesis of short range adhesion, a lumped mechanical model was derived, which, starting from an independent characterization of the rate-dependent interfacial adhesion, predicted qualitatively and quantitatively the experimental results, without the need of any adjustable parameters.en0022-50962025Elsevierhttps://creativecommons.org/licenses/by/4.0/Adhesion | Enhancement | Microvibrations | Pull-off | Sphere contact | Surface energy | ViscoelasticityTechnology::600: TechnologyJournal Articlehttps://doi.org/10.15480/882.1447010.1016/j.jmps.2024.10602010.15480/882.14470Journal Article