Scale and surface morphology effects on the micromechanical contact behavior of granular materials

Scale effects and the influence of surface roughness were investigated on the contact behavior of glass specimens of the grain-grain, grain-block and block-block configurations, where the block corresponds to the limiting case of infinite contact radius. The tests were carried out using in-house mic...

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Bibliographic Details
Published in:Tribology international 2021-07, Vol.159, p.106929, Article 106929
Main Authors: Sandeep, Chitta Sai, Li, Siyue, Senetakis, Kostas
Format: Article
Language:English
Subjects:
Contact
Contact stiffness
Diameters
Equivalence
Friction
Grain size
Granular materials
Morphology
Roughness
Scale effects
Stiffness
Surface roughness
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Summary:Scale effects and the influence of surface roughness were investigated on the contact behavior of glass specimens of the grain-grain, grain-block and block-block configurations, where the block corresponds to the limiting case of infinite contact radius. The tests were carried out using in-house micromechanical apparatuses and the results showed that both the normal and tangential stiffness increased with increasing grain diameter but also decreased with increasing equivalent surface (RMS) roughness. The interface friction increased with increasing equivalent surface roughness but did not depend heavily on grain size. Rough interfaces had extended slip displacements, thus slower degradation of stiffness. •The influence of grain size and surface roughness were studied experimentally.•Normal and tangential stiffness increased with increasing grain size.•Friction was not dependent on size but it did depend on roughness.•Extended slip displacements were observed for rough compared with smooth interfaces.•Scale effects and morphology have important influence in tribological modeling.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2021.106929