When soft gels move across a hard surface, stick–slip frictional sliding is mediated by propagation of adhesion and detachment fronts. Here we experimentally investigate the sliding dynamics of an extended frictional interface between soft Silicone gel and hard PMMA and identify three distinct sliding regimes. We directly visualize the interface and show that a minute manipulation of the initial loading angle results in a sharp bifurcation between the different sliding states. The phase diagram as well as universal scaling relations governing the dynamics is presented.
Bibliographical noteFunding Information:
TY acknowledges T. Hatano, O. Kuwano, H. Matsukawa, and M. Otsuki for their important suggestions, and S. Dillavou for careful reading of the manuscript. This work was supported by Grant-in-Aid for Scientific Research on Innovative Areas, Crustal Dynamics (Grant Number 15H01144 ). SMR acknowledges support of Harvard MRSEC award ( DMR 14-20570 ).
© 2016 Elsevier Ltd
- Schallamach wave