Development and validation of multi scale failure model for dual phase steels

Development of finite element (FEM)/eXtended finite element (XFEM) numerical solution combined with the digital material representation (DMR) approach to simulate brittle/ductile fracture is the subject of the present work. The paper 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 FE/XFE model to simulate interrelations between ductile and brittle fractures occurring within particular phases are presented. Finally, model validation stage based on comparison between experimental and numerical results is discussed. The typical industrial hole expansion test was used as a case study for validation purposes. To numerically describe material behavior at various length scales from microstructure to macro sample a multi scale concept was used in the part as well.