Ductile damage parameters identification for cold metal forming applications

Pierre-Olivier Bouchard (1) , Jean-Marie Gachet (1) , Emile Roux (1)

1 CEMEF - Centre de Mise en Forme des Matériaux

Ductile damage mechanics is essential to predict failure during cold metal forming applications. Several damage models can be found in the literature. These damage models are coupled with the mechanical behavior so as to model the progressive softening of the material due to damage growth. However, the identification of damage parameters remains an issue. In this paper, an inverse analysis approach is set-up to identify ductile damage parameters, based on different kind of mechanical tests and observables. The Lemaitre damage model is used and damage is coupled with the material behavior. The Efficient Global Optimization (EGO) method is used in a parallel environment. This global algorithm based on kriging meta-model enables the identification of a set of damage parameters based on experimental observables. Global and local observables are used to identify these parameters and a special attention is paid to the computation of the cost function. Finally, an identification procedure based on displacement field measurements is presented and applied for damage parameters identification.

Mots clés: ductility; forming processes; cold working

Domaines: Matériaux

Pierre-Olivier Bouchard, Jean-Marie Gachet, Emile Roux. Ductile damage parameters identification for cold metal forming applications. The 14th International Esaform Conference on Material Forming: ESAFORM 2011, Apr 2011, Belfast, United Kingdom. pp.47-52 - ISBN 978-0-7354-0911-8, ⟨10.1063/1.3589490⟩. ⟨hal-00590272⟩