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International Journal of Forming Processes
1292-7775
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 ARTICLE VOL 4/3-4 - 2001  - pp.303-318  - doi:10.3166/ijfp.4.303-318
TITLE
Comparison of Ductile Damage Models

ABSTRACT

The prediction of damage with finite element modelling of thermo-mechanical processes is of main interest for manufactured part optimisation. Several existing plasticity damage theories are intended for the prediction of the growth of voids. Since the early work of Gurson [GUR 77] improved by Tvergaard [TVE 81] and Oudin et al. [OUD 95], constitutive dilatational plastic equations have been proposed by Gelin [GEL 95] and Boyer [BOY 97, BOY 99]. From these dissipation potentials, dilatational plastic stress-strain laws have been discussed and implemented in proprietary finite element software for modelling of axisymmetric bulk forming processes. In the present work, numerical comparison of these ductile damage theories are presented for the collar test and an industrial workability test. The influence of the mean stress and of the deviatoric stress tensor on the void volume fraction rate are analysed. The cases of empty voids and voids with a free inclusion are considered. The sensitiveness of the ductile damage to shear stress is shown with the radii changes of an initial spherical void.

AUTEUR(S)
Cyril BORDREUIL, Emmanuelle VIDAL-SALLÉ, Jean-Claude BOYER

Reçu le 26 juillet 2001.    Accepté le 24 octobre 2001.

KEYWORDS
Metal forming, damage, void growth.

LANGUE DE L'ARTICLE
Anglais

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