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Bulk and fracture process zone contribution to the rate-dependent adhesion amplification in viscoelastic broad-band materials
Citation Link: https://doi.org/10.15480/882.13292
Publikationstyp
Journal Article
Publikationsdatum
2024-09-02
Sprache
English
Author
Maghami, Ali
Wang, Qingao
Papangelo, Antonio
Enthalten in
Volume
193
Article Number
105844
Citation
Journal of the Mechanics and Physics of Solids 193: 105844 (2024-09-02)
Publisher DOI
Scopus ID
Publisher
Elsevier
The contact between a rigid Hertzian indenter and an adhesive broad-band viscoelastic substrate is considered. The material behavior is described by a modified power law model, which is characterized by only four parameters, the glassy and rubbery elastic moduli, a characteristic exponent n and a timescale τ0. The maximum adherence force that can be reached while unloading the rigid indenter from a relaxed viscoelastic half-space is studied by means of a numerical implementation based on the boundary element method, as a function of the unloading velocity, preload and by varying the broadness of the viscoelastic material spectrum. Through a comprehensive numerical analysis we have determined the minimum contact radius that is needed to achieve the maximum amplification of the pull-off force at a specified unloading rate and for different material exponents n. The numerical results are then compared with the prediction of Persson and Brener viscoelastic crack propagation theory, providing excellent agreement. However, comparison against experimental tests for a glass lens indenting a PDMS substrate shows data can be fitted with the linear theory only up to an unloading rate of about 100μm/s showing the fracture process zone rate-dependent contribution to the energy enhancement is of the same order of the bulk dissipation contribution. Hence, the limitations of the current numerical and theoretical models for viscoelastic adhesion are discussed in light of the most recent literature results.
Schlagworte
Adhesion
Enhancement
Modified power law
Pull-off
Sphere contact
Surface energy
Viscoelasticity
DDC Class
620: Engineering
530: Physics
518: Numerical Analysis
539: Matter; Molecular Physics; Atomic and Nuclear physics; Radiation; Quantum Physics
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