Slippery but Tough: The Rapid Fracture of Lubricated Frictional Interfaces

E. Bayart; I. Svetlizky; J. Fineberg

doi:10.1103/PhysRevLett.116.194301

Slippery but Tough: The Rapid Fracture of Lubricated Frictional Interfaces

E. Bayart, I. Svetlizky, J. Fineberg

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

We study the onset of friction for rough contacting blocks whose interface is coated with a thin lubrication layer. High speed measurements of the real contact area and stress fields near the interface reveal that propagating shear cracks mediate lubricated frictional motion. While lubricants reduce interface resistances, surprisingly they significantly increase the energy dissipated Γ during rupture. Moreover, lubricant viscosity affects the onset of friction but has no effect on Γ. Fracture mechanics provide a new way to view the otherwise hidden complex dynamics of the lubrication layer.

Original language	American English
Article number	194301
Journal	Physical Review Letters
Volume	116
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.116.194301
State	Published - 10 May 2016

Bibliographical note

Funding Information:
We acknowledge support from the James S. McDonnell Fund (Grant No. 220020221), the European Research Council (Grant No.?267256), and the Israel Science Foundation (Grants No. 76/11 and No. 1523/15). E. B. acknowledges support from the Lady Davis Trust.

Publisher Copyright:
© 2016 American Physical Society.

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10.1103/PhysRevLett.116.194301

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abstract = "We study the onset of friction for rough contacting blocks whose interface is coated with a thin lubrication layer. High speed measurements of the real contact area and stress fields near the interface reveal that propagating shear cracks mediate lubricated frictional motion. While lubricants reduce interface resistances, surprisingly they significantly increase the energy dissipated Γ during rupture. Moreover, lubricant viscosity affects the onset of friction but has no effect on Γ. Fracture mechanics provide a new way to view the otherwise hidden complex dynamics of the lubrication layer.",

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Slippery but Tough: The Rapid Fracture of Lubricated Frictional Interfaces

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