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Predicting frictional aging from bulk relaxation measurements

Author

Listed:
  • Kasra Farain

    (University of Amsterdam)

  • Daniel Bonn

    (University of Amsterdam)

Abstract

The coefficient of static friction between solids normally increases with the time they have remained in static contact before the measurement. This phenomenon, known as frictional aging, is at the origin of the difference between static and dynamic friction coefficients but has remained difficult to understand. It is usually attributed to a slow expansion of the area of atomic contact as the interface changes under pressure. This is however challenging to quantify as surfaces have roughness at all length scales. In addition, friction is not always proportional to the contact area. Here we show that the normalized stress relaxation of the surface asperities during frictional contact with a hard substrate is the same as that of the bulk material, regardless of the asperities’ size or degree of compression. This result enables us to predict the frictional aging of rough interfaces based on the bulk material properties of two typical polymers: polypropylene and polytetrafluoroethylene.

Suggested Citation

  • Kasra Farain & Daniel Bonn, 2023. "Predicting frictional aging from bulk relaxation measurements," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39350-3
    DOI: 10.1038/s41467-023-39350-3
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    References listed on IDEAS

    as
    1. B. Weber & T. Suhina & T. Junge & L. Pastewka & A. M. Brouwer & D. Bonn, 2018. "Molecular probes reveal deviations from Amontons’ law in multi-asperity frictional contacts," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    2. Binquan Luan & Mark O. Robbins, 2005. "The breakdown of continuum models for mechanical contacts," Nature, Nature, vol. 435(7044), pages 929-932, June.
    3. Qunyang Li & Terry E. Tullis & David Goldsby & Robert W. Carpick, 2011. "Frictional ageing from interfacial bonding and the origins of rate and state friction," Nature, Nature, vol. 480(7376), pages 233-236, December.
    4. Oded Ben-David & Shmuel M. Rubinstein & Jay Fineberg, 2010. "Slip-stick and the evolution of frictional strength," Nature, Nature, vol. 463(7277), pages 76-79, January.
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