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Implementation and validation of a Gurson damage model modified for shear loading: effect of void growth rate and mesh size on the predicted behavior

Communication avec acte
Author
ACHOURI, Mohamed
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
ccGERMAIN, Guénaël
206863 Laboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité [LAMPA - PMD]
DAL SANTO, Philippe
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
SAIDANE, Delphine
215545 2DEVILLE SA

URI
http://hdl.handle.net/10985/6798
DOI
10.4028/www.scientific.net/KEM.504-506.691
Date
2012

Abstract

The optimization of automotive security components requires good knowledge of the material state after fabrication, particularly with respect to damage that may have been done to the material by the manufacturing process. To achieve this, numerical simulation of the fabrication process is often undertaken. However, classical continuum damage models, like the Gurson [3] model, are not appropriate for the simulation of the blanking by punching operation because the material damage is primarily the result of shear stresses. This work is focused on the use and validation of a modified Gurson type damage model capable of modeling this process, which has recently been proposed by Nahshan [7]. After a brief description of the modification, the implementation and the validation of the modified Gurson model is detailed. A comparison between the original Gurson model and the modified model is presented in order to highlight the importance of the modification for a pure shear stress state and to show that the two models are equivalent for a purely hydrostatic stress state. It is also shown that the results from the modified model are dependent on the finite element mesh size.

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