Numerical investigation and experimental validation of physically based advanced GTN model for DP steels

Joseph Fansi (1, 2, 3) , X. Lemoine (1, 4) , Éric Maire (5) , Caroline Landron (5) , Olivier Bouaziz (4, 6) , Mohamed Ben Bettaieb , Anne-Marie Habraken (7)

1 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
2 ArcelorMittal Maizières Research SA
3 ArGEnCo - ArGEnCo Department, MS2F Division
4 ArcelorMittal
5 MATEIS - Matériaux, ingénierie et science [Villeurbanne]
6 CDM - Centre des Matériaux
7 Mechanics and Structures Department

This numerical investigation of an advanced Gurson-Tvergaard-Needleman (GTN) model is an extension of the original work of Ben Bettaiebet al. (2011 [18]). The model has been implemented as a user-defined material model subroutine (VUMAT) in the Abaqus/explicit FE code. The current damage model extends the previous version by integrating the three damage mechanisms: nucleation, growth and coalescence of voids. Physically based void nucleation and growth laws are considered, including an effect of the kinematic hardening. These new contributions are based and validated on experimental results provided by high-resolution X-ray absorption tomography measurements. The current damage model is applied to predict the damage evolution and the stress state in a tensile notched specimen experiment.

Mots clés: Damage; GTN model; Nucleation; Coalescence; DP steel; Tomography

Domaines: Matériaux

Joseph Fansi, X. Lemoine, Éric Maire, Caroline Landron, Olivier Bouaziz, et al.. Numerical investigation and experimental validation of physically based advanced GTN model for DP steels. Materials Science and Engineering: A, 2013, 569, pp.1-12. ⟨10.1016/j.msea.2013.01.019⟩. ⟨hal-00790173⟩