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Hardening effects on strain localization predictions in porous ductile materials using the bifurcation approach

Article dans une revue avec comité de lecture
Auteur
ccCHALAL, Hocine
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
ccABED-MERAIM, Farid 

URI
http://hdl.handle.net/10985/9972
DOI
10.1016/j.mechmat.2015.07.012
Date
2015
Journal
Mechanics of Materials

Résumé

The localization of deformation into planar bands is often considered as the ultimate stage of strain prior to ductile fracture. In this study, ductility limits of metallic materials are predicted using the Gurson–Tvergaard–Needleman (GTN) damage model combined with the bifurcation approach. Both the GTN constitutive equations and the Rice bifurcation criterion are implemented into the finite element (FE) code ABAQUS/Standard within the framework of large plastic strains and a fully three-dimensional formulation. The current contribution focuses on the effect of strain hardening on ductility limit predictions. It is shown that the choice of void nucleation mechanism has an important influence on the sensitivity of the predicted ductility limits to strain hardening. When strain-controlled nucleation is considered, varying the hardening parameters of the fully dense matrix material has no effect on the porosity evolution and, consequently, very small impact on the predicted ductility limits. For stress-controlled nucleation, the porosity evolution is directly affected by the strain hardening characteristics, which induce a significant effect on the predicted ductility limits. This paper also discusses the use of a micromechanics-based calibration for the GTN q -parameters in the case of strain-controlled nucleation, which is also shown to allow accounting for the hardening effects on plastic strain localization.

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Fin d'embargo:
2017-11-08
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Documents liés

Visualiser des documents liés par titre, auteur, créateur et sujet.

  • Efficient solid–shell finite elements for quasi-static and dynamic analyses and their application to sheet metal forming simulation 
    Article dans une revue avec comité de lecture
    WANG, Peng; ccCHALAL, Hocine; ccABED-MERAIM, Farid  (Trans Tech Publications, 2015)
    Thin structures are commonly designed and employedin engineering industries to save material, reduce weight and improve the overall performance of products. The finite element (FE) simulation of such thin structural ...
  • Ductility limit prediction using a GTN damage model coupled with localization bifurcation analysis 
    Article dans une revue avec comité de lecture
    MANSOURI, Lotfi; ccCHALAL, Hocine; ccABED-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) ...
  • Simulation of Structural Applications and Sheet Metal Forming Processes Based on Quadratic Solid–Shell Elements with Explicit Dynamic Formulation 
    Article dans une revue avec comité de lecture
    ccCHALAL, Hocine; ccABED-MERAIM, Farid  (World Scientific Publishing, 2019)
    In this work, nonlinear dynamic analysis of thin structures is investigated using quadratic solid–shell (SHB-EXP) elements. The proposed SHB-EXP elements are based on a fully three-dimensional formulation using an in-plane ...
  • Formability limit prediction of TRIP780 steel sheet using lode angle dependent gurson-based models with Thomason coalescence criterion and bifurcation analysis 
    Communication avec acte
    NASIR, Muhammad Waqar; ccCHALAL, Hocine; ccABED-MERAIM, Farid  (AIP Publishing, 2019)
    For biaxial stretching strain paths, which are typically encountered in sheet metal forming, the stress triaxiality ranges from 0.33 to 0.67. At this low level of triaxiality, voids change their shape from spherical to ...
  • Formability prediction of ductile materials using a non-associative plasticity model and bifurcation-based criteria 
    Communication avec acte
    BOUKTIR, Yasser; ccCHALAL, Hocine; ccABED-MERAIM, Farid  (2016)
    Plastic instabilities such as diffuse or localized necking may occur during sheet metal forming processes, thus limiting sheet metal formability, which is detrimental to industry. The formability of sheet metals is usually ...

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