Elastic Wave Modeling in Nonlinear Mesoscopic Materials by using Finite Integration Techniques with Dynamic Grid Management

In the present paper an EFIT algorithm (EFIT: Elastodynamic Finite Integration Technique) with dynamic grid management is presented which is based on micorstructural models of nonlinear mesoscopic elasticity. This new algorithm includes the explicit implementation of opening and closing cracks as well as dynamic hysteretic changes in the bond system between two grains. The developed numerical code leads to a better understanding of the causes and mechanisms of nonlinear mesoscopic elasticity and thus can help to optimize nonlinear acoustic techniques for micro-scale damage diagnostics