Size-dependent plasticity in contact/friction: from discrete dislocation dynamics inside an asperity to statistical summation over asperities

Hengxu Song


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The roughness of natural surfaces emerges in the form of surface asperities at length scales of micrometers or smaller, where plasticity is known to be size dependent: smaller is harder. However, existing contact/friction models, such as Greenwood-Williamson (GW) statistical model and its extended models, Persson's contact model for fractal surfaces, FEM models, either ignore plasticity or, at best, adopt size-independent plasticity. Therefore, there is a need to incorporate size-dependent plasticity into contact/friction models. The overall objective of this work is to gain a better understanding of contact/friction at micron/sub-micron length scales with an emphasis on the potential role of size-dependent plasticity.
Originele taal-2English
KwalificatieDoctor of Philosophy
Toekennende instantie
  • Rijksuniversiteit Groningen
  • van der Giessen, Erik, Supervisor
Datum van toekenning29-nov.-2016
Plaats van publicatie[Groningen]
Gedrukte ISBN's978-90-367-9311-7
Elektronische ISBN's978-90-367-9310-0
StatusPublished - 2016

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