Explicit finite-difference procedures for elastodynamic analysis of layered media

Summary Explicit finite-difference procedures are proposed to simulate the elastodynamic response of layered media. To avoid large numerical dispersion and dissipation, different grid sizes are used for different material layers so that the CFL number in each layer can be set to one in the limit. The master-slave technique is applied to deal with the mismatch of grids along the material interface. The interface can be either bonded or unbonded. The dynamic contact between two layers along an unbonded interface is also considered. Numerical examples are presented. Received 4 August 1997; accepted for publication 24 April 1998