• français
    • English
    English
  • Ouvrir une session
Aide
Voir le document 
  •   Accueil de SAM
  • Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3)
  • Voir le document
  • Accueil de SAM
  • Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3)
  • Voir le document
JavaScript is disabled for your browser. Some features of this site may not work without it.

Prediction of Plastic Instability in Sheet Metals During Forming Processes Using the Loss of Ellipticity Approach

Article dans une revue avec comité de lecture
Auteur
AKPAMA, Holanyo K.
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
ccBEN BETTAIEB, Mohamed
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
ccABED-MERAIM, Farid
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
243747 Labex DAMAS

URI
http://hdl.handle.net/10985/11915
DOI
10.1590/1679-78253544
Date
2017
Journal
Latin American Journal of Solids and Structures

Résumé

The prediction of plastic instability in sheet metals during forming processes represents nowadays an ambitious challenge. To reach this goal, a new numerical approach, based on the loss of ellipticity criterion, is proposed in the present contribution. A polycrystalline model is implemented as a user-material subroutine into the ABAQUS/Implicit finite element (FE) code. The polycrystalline constitutive model is assigned to each integration point of the FE mesh. To derive the mechanical behavior of this polycrystalline aggregate from the behavior of its microscopic constituents, the multiscale self-consistent scheme is used. The mechanical behavior of the single crystals is described by a finite strain rateindependent constitutive framework, where the Schmid law is used to model the plastic flow. The condition of loss of ellipticity at the macroscale is used as plastic instability criterion in the FE modeling. This numerical approach, which couples the FE method with the self-consistent scheme, is used to simulate a deep drawing process, and the above criterion is used to predict the formability limit of the studied sheets during this operation.

Fichier(s) constituant cette publication

Nom:
LEM3_LAJSS_2017_AKPAMA.pdf
Taille:
2.910Mo
Format:
PDF
Voir/Ouvrir

Cette publication figure dans le(s) laboratoire(s) suivant(s)

  • Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3)

Documents liés

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

  • Influence of the Yield Surface Curvature on the Forming Limit Diagrams Predicted by Crystal Plasticity Theory 
    Article dans une revue avec comité de lecture
    AKPAMA, Holanyo K.; ccBEN BETTAIEB, Mohamed; ccABED-MERAIM, Farid (Argentinean Association of Computational Mechanics, Brazilian Association of Computational Mechanics, Mexican Association of Numerical Methods in Engineering and Applied Sciences, 2016)
    The aim of this paper is to investigate the impact of the microscopic yield surface (i.e., at the single crystal scale) on the forming limit diagrams (FLDs) of face centred cubic (FCC) materials. To predict these FLDs, ...
  • Numerical integration of rate-independent BCC single crystal plasticity models: comparative study of two classes of numerical algorithms 
    Article dans une revue avec comité de lecture
    AKPAMA, Holanyo K.; ccBEN BETTAIEB, Mohamed; ccABED-MERAIM, Farid (Wiley, 2016)
    In an incremental formulation suitable to numerical implementation, the use of rate-independent theory of crystal plasticity essentially leads to four fundamental problems. The first is to determine the set of potentially ...
  • A comparative study of Forming Limit Diagrams predicted by two different plasticity theories involving vertex effects 
    Article dans une revue avec comité de lecture
    AKPAMA, Holanyo K.; ccBEN BETTAIEB, Mohamed; ccABED-MERAIM, Farid (Trans Tech Publications, 2015)
    The main objective of this contribution is to compare the Forming Limit Diagrams (FLDs) predicted by the use of two different vertex theories. The first theory is micromechanical and is based on the use of the ...
  • Localized necking predictions based on rate-independent self-consistent polycrystal plasticity: Bifurcation analysis versus imperfection approach 
    Article dans une revue avec comité de lecture
    AKPAMA, Holanyo K.; ccBEN BETTAIEB, Mohamed; ccABED-MERAIM, Farid (Elsevier, 2017)
    The present study focuses on the development of a relevant numerical tool for predicting the onset of localized necking in polycrystalline aggregates. The latter are assumed to be representative of thin metal sheets. In ...
  • Ductility prediction of substrate-supported metal layers based on rate-independent crystal plasticity theory 
    Communication avec acte
    AKPAMA, Holanyo K.; ccBEN BETTAIEB, Mohamed; ccABED-MERAIM, Farid (2016)
    In this paper, both the bifurcation theory and the initial imperfection approach are used to predict localized necking in substrate-supported metal layers. The self-consistent scale-transition scheme is used to derive the ...

Parcourir

Tout SAMLaboratoiresAuteursDates de publicationCampus/InstitutsCe LaboratoireAuteursDates de publicationCampus/Instituts

Lettre Diffuser la Science

Dernière lettreVoir plus

Statistiques de consultation

Publications les plus consultéesStatistiques par paysAuteurs les plus consultés

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales

ÉCOLE NATIONALE SUPERIEURE D'ARTS ET METIERS

  • Contact
  • Mentions légales