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Liu S., Wu J.♦, He S.♦, Yuan X.♦, Stupkiewicz S., Wang Y.♦, Effect of substrate stiffness on interfacial Schallamach wave of flexible film/substrate bilayer structure: Cohesive contact insight,
TRIBOLOGY INTERNATIONAL, ISSN: 0301-679X, DOI: 10.1016/j.triboint.2024.110358, Vol.202, pp.110358-1-14, 2025 Abstract:
As the critical feature of the stick-slip for soft materials, the interfacial Schallamach waves of flexible composite structures are essential for smart tactile sensors to realize sliding perception. Herein, the Schallamach waves of polydimethylsiloxane film/substrate bilayer structures with three substrate stiffnesses regulated by porosities are investigated by setting up in-situ sliding tests and establishing finite element models with mixed-mode cohesive contact. Inhomogeneity in microcontact stiffness disrupts the continuity and synchronization of the Schallamach waves, resulting in non-periodic fluctuations in the contact force. The buckling phenomenon of the film structure marks the transition from stick to slip. This buckling induces a shift at the crack front from normal compressive stress to tensile stress, leading to mixed-mode damage. Keywords:
Stick-slip,Polydimethylsiloxane film/substrate bilayer structures,Schallamach wave,In-situ sliding test,Mixed-mode cohesive contact model Affiliations:
| Liu S. | - | IPPT PAN | | Wu J. | - | other affiliation | | He S. | - | other affiliation | | Yuan X. | - | Imperial College London (GB) | | Stupkiewicz S. | - | IPPT PAN | | Wang Y. | - | Beijing Aeronautical Manufacturing Technology Research Institute (CN) |
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