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The Amontons-Coulomb friction law assumes that the frictional force between materials is independent of sliding velocity. However, as Coulomb noted, this is a rough approximation, and a second-order dependence of friction on the logarithm of sliding velocity is incorporated in a commonly used ‘rate- and state-dependent’ friction representation. Here we conduct shear experiments on mica, a layer-structured mineral, at temperatures ranging from 22 to 200 ºC and under normal stress of 100 MPa. The friction coefficient clearly depends on the logarithmic sliding velocity at 22 ºC, but rate sensitivity decreases with increasing temperature until at 200 ºC, the friction coefficient is independent of sliding velocity. Our findings could initiate the development of velocity-independent frictional materials, realizing the ideal Amontons-Coulomb friction.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Friction, Mica, Ripplocation

Date published: 2026-07-20

Publisher: American Physical Society (APS)

Journal:

• PHYSICAL REVIEW LETTERS (ISSN: 10797114) vol. 137 issue. 4

Funding:

• Japan Society for the Promotion of Science JP24K00795
• Japan Society for the Promotion of Science JP25H00688
• Japan Society for the Promotion of Science JP20K04115

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1103/y3jy-nqcd

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Updated at: 2026-07-24 11:05:45 +0900

Published on MDR: 2026-07-24 12:28:53 +0900