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Development of hybrid finite element/eXtended finite element numerical solution combined with the digital material representation (DMR) approach to simulate brittle/ductile fracture is the overall subject of the realized research. This particular work is divided into three main parts. In the first, proposed procedures for development of DMR model of investigated two phase steel are described. Then, details on the procedure of creation of representative digital material representation model to simulate interrelations between ductile and brittle fractures occurring within particular phases are presented. Finally, based on evaluated model parameters examples of its application to numerical simulation of failure in DP steels are presented. The main outcome from this work is the hybrid FEM/XFEM model, which can be easily applied to various deformation processes. The approach fulfils industrial demand to create a computer aided design of processes were fracture is an issue. Presented model is designed for practical research and industrial applications. K. Perzyński and L. Madej

HYBRID FE/XFE FINITE ELEMENT MODEL FOR SIMULATION OF BRITTLE-DUCTILE FRACTURES IN DUAL-PHASE STEEL GRADES.