Thermodynamic aspects of rock friction
arXiv:1312.4930 · doi:10.1007/s40328-014-0048-6
Abstract
Rate- and state-dependent friction law for velocity-step tests is analyzed from a thermodynamic point of view. A simple macroscopic non-equilibrium thermodynamic model with a single internal variable reproduces instantaneous jump and relaxation. Velocity weakening appears as a consequence of a plasticity related nonlinear coefficient. Permanent part of displacement corresponds to plastic strain, and relaxation effects are analogous to creep in thermodynamic rheology.
13 pages 3 figures. Revision: thermodynamic compatibility of velocity weakening