title: Transition from static to kinetic friction: insights from a 2D model.
abstract: We describe a 2D spring-block model for the transition from static to kinetic friction at an elastic-slider-rigid-substrate interface obeying a minimalistic friction law (Amontons-Coulomb). By using realistic boundary conditions, a number of previously unexplained experimental results on precursory microslip fronts are successfully reproduced. From the analysis of the interfacial stresses, we derive a prediction for the evolution of the precursor length as a function of the applied loads, as well as an approximate relationship between microscopic and macroscopic friction coefficients. We show that the stress buildup due to both elastic loading and microslip-related relaxations depends only weakly on the underlying shear crack propagation dynamics. Conversely, crack speed depends strongly on both the instantaneous stresses and the friction coefficients, through a nontrivial scaling parameter.
authors: Physics of Geological Processes, University of Oslo, Norway.
authors: J
authors: J
authors: Trømborg
authors: J
authors: J
authors: Scheibert
authors: D S
authors: DS
authors: Amundsen
authors: K
authors: K
authors: Thøgersen
authors: A
authors: A
authors: Malthe-Sørenssen
mesh_terms: D004548:Elasticity; D017276:Friction; D007700:Kinetics; D008962:Models, Theoretical