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The structure of slip-pulses and supershear ruptures driving slip in bimaterial friction

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  • Hadar Shlomai

    (The Racah Institute of Physics, The Hebrew University of Jerusalem)

  • Jay Fineberg

    (The Racah Institute of Physics, The Hebrew University of Jerusalem)

Abstract

The most general frictional motion in nature involves bimaterial interfaces, when contacting bodies possess different elastic properties. Frictional motion occurs when the contacts composing the interface separating these bodies detach via propagating rupture fronts. Coupling between slip and normal stress variations is unique to bimaterial interfaces. Here we use high speed simultaneous measurements of slip velocities, real contact area and stresses to explicitly reveal this bimaterial coupling and its role in determining different classes of rupture modes and their structures. We directly observe slip-pulses, highly localized slip accompanied by large local reduction of the normal stress near the rupture tip. These pulses propagate in the direction of motion of the softer material at a selected (maximal) velocity and continuously evolve while propagating. In the opposite direction bimaterial coupling favors crack-like ‘supershear’ fronts. The robustness of these structures shows the importance of bimaterial coupling to frictional motion and modes of frictional dissipation.

Suggested Citation

  • Hadar Shlomai & Jay Fineberg, 2016. "The structure of slip-pulses and supershear ruptures driving slip in bimaterial friction," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11787
    DOI: 10.1038/ncomms11787
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