Abstract
We discussed the role of the long-range elastic interaction between the contacts inside an inhomogeneous frictional interface. The interaction produces a characteristic elastic correlation length λc = a 2 E/k c (where a is the distance between the contacts, k c is the elastic constant of a contact, and E is the Young modulus of the sliding body), below which the slider may be considered as a rigid body. The strong inter-contact interaction leads to a narrowing of the effective threshold distribution for contact breaking and enhances the chances for an elastic instability to appear. Above the correlation length, r > λc, the interaction leads to screening of local perturbations in the interface, or to appearance of collective modes—frictional cracks propagating as solitary waves.
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Acknowledgments
The authors wish to express their gratitude to E.A. Jagla, B.N.J. Persson, M. Urbakh, and S. Zapperi for helpful discussions. This study was supported in part by CNRS-Ukraine PICS grant No. 5421, by ESF Eurocore FANAS AFRI through CNR-Italy, by PRIN/COFIN 20087NX9Y7, and by the SNF Sinergia Project NPA1617. O.B. acknowledges hospitality at SISSA and ICTP Trieste.
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Braun, O.M., Peyrard, M., Stryzheus, D.V. et al. Collective Effects at Frictional Interfaces. Tribol Lett 48, 11–25 (2012). https://doi.org/10.1007/s11249-012-9913-z
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DOI: https://doi.org/10.1007/s11249-012-9913-z