Numerical simulation of sheet metal blanking predicting the shape of the cut edge

• Published in: Key engineering materials 2002-12, Vol.233-236, p.329-334
• Main Authors: Rachik, M, Roelandt, J M, Maillard, A
• Format: Article
• Language: English
• ISSN: 1013-9826

While the majority of metal forming processes strains the material only in the plastic domain, blanking process leads to the creation and the propagation of cracks. In a like manner, for realistic simulation of this process, the damage phenomena must be taken into account. Several finite element models have been proposed for the blanking process simulation. The majority of these models use a discrete crack propagation model to predict the material separation and the product shape near the cut edge. This approach leads to several sources of error that make the prediction quality quite poor. In our work, to handle the ductile fracture, we use the continuum coupled damage model of Gurson-Tvergaard-Needleman based on the void volume fraction evolution. This damage variable is then used to predict the punch penetration at fracture and the shape of the cut edge (the shear zone, the fracture zone and the burr height). [Steels: DD13 and X6Cr17.]