In this paper, a phase field model of ductile fracture is described within the framework of large plastic strains. Most results dealing with phase field modeling of ductile fracture are carried out on a fixed mesh, which requires a fine mesh throughout all the computation. The aim of this paper is to introduce an adaptive isotropic remeshing strategy coupled with a phase field model of ductile fracture to achieve accurate results with a major decrease in computational time. A mixed velocity/pressure finite element formulation is used for the solution of mechanical fields. The plastic strain field needs to be transferred to the new mesh after each remeshing operation. This field transfer requires the use of a suitable remeshing-transfer operator. Different field transfer operators are tested and results are reported. In order to reduce the numerical diffusion associated with the field transfer operation, a volume quality based metric has been introduced. This paper presents different numerical examples with both qualitative and quantitative analyses in order to show the ability of the developed strategy in predicting crack evolution in ductile materials. The proposed framework is also able to predict crack paths in highly ductile materials while benefiting from space-adaptivity.
In this paper we review the latest developments on high-speed forming at the Centre for Material Forming (CEMEF). We have developed a 3D Finite Elements analysis toolbox for the simulation of Electromagnetic forming (EMF) within the frame of the software FORGE. At the same time we have recently acquired an EMF machine to study the behavior of materials at high deformation speeds. We describe the modeling strategy for the simulation package together with some results for a ring expansion case. We also present the experimental settings and some preliminary results for a direct free forming of flat metal sheet.
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