Determination of forming limit diagrams based on ductile damage models and necking criteria
TypeArticles dans des revues avec comité de lecture
In this paper, forming limit diagrams (FLDs) for an aluminum alloy are predicted through numerical simulations using various localized necking criteria. A comparative study is conducted for the FLDs determined by using the Lemaitre damage approach and those obtained with the modified Gurson–Tvergaard–Needleman (GTN) damage model. To this end, both damage models coupled with elasto-plasticity and accounting for plastic anisotropy have been implemented into the ABAQUS/Explicit software, through the user-defined subroutine VUMAT, within the framework of large plastic strains and a fully three-dimensional formulation. The resulting constitutive frameworks are then combined with four localized necking criteria to predict the limit strains for an AA6016-T4 aluminum alloy. Three of these necking criteria are based on finite element (FE) simulations of the Nakazima deep drawing test with various specimen geometries, while the fourth criterion is based on bifurcation theory. The simulation results reveal that the limit strains predicted by local criteria, which are based on FE simulations of the Nakazima test, are in good agreement with the experiments for a number of strain paths, while those obtained with the bifurcation analysis provide an upper bound to the experimental FLD.
Files in this item
Showing items related by title, author, creator and subject.
On the implementation of the continuum shell finite element SHB8PS and application to sheet forming simulation SALAHOUELHADJ, Abdellah; ABED-MERAIM, Farid; CHALAL, Hocine; BALAN, Tudor (American Institute of Physics, 2011)In this contribution, the formulation of the SHB8PS continuum shell finite element is extended to anisotropic elastic-plastic behavior models with combined isotropic-kinematic hardening at large deformations. The resulting ...
RACZ, Sever-Gabriel; KHAN, Salim; CHALAL, Hocine; ABED-MERAIM, Farid; BALAN, Tudor (Francisco Chinesta , Yvan Chastel and Mohamed El Mansori, 2011)Within the framework of sheet metal forming, the importance of hardening models for springback predictions has been often emphasized. While some specific applications require very accurate models, in many common situations ...
Ductility limit prediction using a GTN damage model coupled with localization bifurcation analysis MANSOURI, Lotfi; CHALAL, Hocine; ABED-MERAIM, Farid (Elsevier, 2014)Because the localization of deformation into narrow planar bands is often precursor to material failure, several approaches have been proposed to predict this phenomenon. In this paper, the Gurson–Tvergaard– Needleman (GTN) ...
Prediction of strain localization during sheet metal forming using bifurcation analysis and Gurson-type damage MANSOURI, Lotfi; CHALAL, Hocine; ABED-MERAIM, Farid; BALAN, Tudor (E. Oñate, D.R.J. Owen, D. Peric and B. Suárez, 2011)The strain localization phenomenon that may occur during sheet metal forming represents a major cause of defective parts produced in the industry. Several instability criteria have been developed in the literature to predict ...
Investigation of ductility limits based on bifurcation theory coupled with continuum damage mechanics BOUKTIR, Yasser; CHALAL, Hocine; HADDAD, Moussa; ABED-MERAIM, Farid (Elsevier, 2015)The ductility limits of an St14 steel are investigated using an elastic‒plastic‒damage model and bifurcation theory. An associative J2-flow theory of plasticity is coupled with damage within the framework of continuum ...