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A comparative study of Forming Limit Diagrams predicted by two different plasticity theories involving vertex effects

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]

URI
http://hdl.handle.net/10985/10048
DOI
10.4028/www.scientific.net/KEM.651-653.21
Date
2015
Journal
Key Engineering Materials

Résumé

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 Schmid law, within the framework of crystal plasticity coupled with the Taylor scale-transition scheme. The second theory is phenomenological and is based on the deformation theory of plasticity. For both theories, the mechanical behavior is formulated in the finite strain framework and is assumed to be isotropic and rate-independent. The theoretical framework of these approaches will be presented in details. In the micro-macro modeling, the isotropy is ensured by considering an isotropic initial texture. In the phenomenological modeling, the material parameters are identified on the basis of micro-macro simulations of tensile tests.

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  • 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 ...
  • 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 ...
  • Prediction of localized necking based on crystal plasticity: Comparison of bifurcation and imperfection approaches 
    Communication avec acte
    AKPAMA, Holanyo K.; ccBEN BETTAIEB, Mohamed; ccABED-MERAIM, Farid (Trans Tech Publication, 2016)
    In the present work, a powerful modeling tool is developed to predict and analyze the onset of strain localization in polycrystalline aggregates. The predictions of localized necking are based on two plastic instability ...

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