Experimental characterization and numerical modeling of micromechanical damage under different stress states - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Materials & Design Année : 2013

Experimental characterization and numerical modeling of micromechanical damage under different stress states

Résumé

The use of HSLA steels for the manufacture of automotive components is interesting from an engineering point of view. This family of steels, while possessing high strength, also has good formability and can be used in forming manufacturing processes. In some forming processes such as blanking, shear strain localization occurs, which causes damage and results in the final fracture of the material. This paper presents an experimental study based on in situ tests to understand and identify the physical mechanisms of ductile damage under two stress states: tension and shear. Different macroscopic tests were performed to calibrate a damage model based on a micromechanical approach. This damage model is based on the Gurson-Tvergaard-Needleman theory and presents recent improvements proposed by Nahshon and Hutchinson and by Nielsen and Tvergaard so as to better predict fracture under a wide range of stress states, especially with low levels of stress triaxiality. These extensions have made the identification of the material parameter more complicated. In this work an identification strategy has been proposed using tests on specimens with different shapes. The identified parameter values are validated and the fracture model show good predictive capability over a wide stress state range.
Fichier principal
Vignette du fichier
LAMPA_M_D_ACHOURI_2013.pdf (4.48 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01057964 , version 1 (04-09-2017)

Identifiants

Citer

Mohamed Achouri, Guénaël Germain, Philippe Dal Santo, Delphine Saidane. Experimental characterization and numerical modeling of micromechanical damage under different stress states. Materials & Design, 2013, 50, pp.207-222. ⟨10.1016/j.matdes.2013.02.075⟩. ⟨hal-01057964⟩
80 Consultations
628 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More