MULTISCALE MATERIALS MODELING OF FRACTURE IN Fe USING MODIFIED BOUNDARY LAYER (MBL)

摘要

In this paper the use of modified boundary layer (MBL) in multiscale modeling of fracture in bcc-Fe has been investigated. The multiscale method used is the Quasicontinuum (QC) method with an EAM interatomic potential. The influence of T-stress level in the multiscale simulation has been studied, and also what effect this have on the crack tip behavior. A higher T-stress gives a higher constraint, which again influences the fracture. Both an isotropic and an anisotropic formulation of the MBL model have been implemented and compared. The results shows how the stress intensity factor and fracture behavior vary with the T-stress and crystallographic orientations.