Dynamics of static friction between steel and silicon | Zendy

Zhiping Yang | Zendy; Hepeng Zhang | Zendy; Michael Marder | Zendy

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Dynamics of static friction between steel and silicon

Author(s) -

Zhiping Yang,

Hepeng Zhang,

Michael Marder

Publication year - 2008

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.0806174105

Subject(s) - static friction , mechanics , silicon , slip (aerodynamics) , dynamics (music) , materials science , friction coefficient , lock (firearm) , physics , classical mechanics , statistical physics , structural engineering , composite material , thermodynamics , metallurgy , engineering , acoustics

We conducted experiments in which steel and silicon or quartz are clamped together. Even with the smallest tangential forces we could apply, we always found reproducible sliding motions on the nanometer scale. The velocities we study are thousands of times smaller than in previous investigations. The samples first slide and then lock up even when external forces hold steady. One might call the result "slip-stick" friction. We account for the results with a phenomenological theory that results from considering the rate and state theory of dynamic friction at low velocities. Our measurements lead us to set the instantaneous coefficient of static friction that normally enters rate and state theories to zero.

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