Abstract:
:Amontons' law defines the friction coefficient as the ratio between friction force and normal force, and assumes that both these forces depend linearly on the real contact area between the two sliding surfaces. However, experimental testing of frictional contact models has proven difficult, because few in situ experiments are able to resolve this real contact area. Here, we present a contact detection method with molecular-level sensitivity. We find that while the friction force is proportional to the real contact area, the real contact area does not increase linearly with normal force. Contact simulations show that this is due to both elastic interactions between asperities on the surface and contact plasticity of the asperities. We reproduce the contact area and fine details of the measured contact geometry by including plastic hardening into the simulations. These new insights will pave the way for a quantitative microscopic understanding of contact mechanics and tribology.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Weber B,Suhina T,Junge T,Pastewka L,Brouwer AM,Bonn Ddoi
10.1038/s41467-018-02981-ysubject
Has Abstractpub_date
2018-03-01 00:00:00pages
888issue
1issn
2041-1723pii
10.1038/s41467-018-02981-yjournal_volume
9pub_type
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