Hybrid discrete element/finite element method for fracture analysis

The discrete element method DEM has been used in fracture mechanics studies of heterogeneous media, for example plain concrete. One of the current limitations of particle methods for fracture analysis is related with the high number of particles that are necessary in the discretization, which limits the use of particle systems in larger structures. In order to apply the particle method to the analysis of larger structures, a hybrid method is proposed which uses the DEM in the discretization of the fracture zone, and, uses for the surrounding areas a discretization based on the finite element method. Test results of the hybrid model and two applications to notched beam fracture experiments in mode I and in mixed mode are presented and discussed.