Nonlinear and Nonequilibrium Dynamics in Geomaterials

Details Nonlinear and Nonequilibrium Dynamics in Geomaterials Nonlinear and Nonequilibrium Dynamics in Geomaterials

2004-02-27

arxiv.org/abs/cond-mat/0403004v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.065501

The transition from linear to nonlinear dynamical elasticity in rocks is of considerable interest in seismic wave propagation as well as in understanding the basic dynamical processes in consolidated granular materials. We have carried out a careful experimental investigation of this transition for Berea and Fontainebleau sandstones. Below a well-characterized strain, the materials behave linearly, transitioning beyond that point to a nonlinear behavior which can be accurately captured by a simple macroscopic dynamical model. At even higher strains, effects due to a driven nonequilibrium state, and relaxation from it, complicate the characterization of the nonlinear behavior.

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