Ultrafast ultrasonic imaging of dynamic sliding friction in soft solids: The slow slip and the super-shear regimes
Institut des Sciences de la Terre, Université Joseph Fourier Grenoble I and CNRS - BP53, 38041 Grenoble, France, EU
2 École Normale Supérieure de Lyon - 46 allée d'Italie, Lyon, France, EU (b)
3 Physics of Geological Processes, University of Oslo - box 1047, 0316 Blindern, Norway
Accepted: 17 October 2011
Ultrafast ultrasonic speckle interferometry, an imaging technique derived from elastography, is used to follow the dynamic of the interface failure in a friction experiment. Experimental results that characterise two slipping regimes are presented: a slow slip regime associated with depinning events at the interface and a supershear rupture regime associated with the emission of Mach waves fronts. These results are discussed in the light of geophysical observations made at the scale of the Earth on the slip dynamics in active faults.
PACS: 91.55.Fg – Dynamics and mechanics of faulting / 62.20.Qp – Friction, tribology, and hardness
© EPLA, 2011