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Définition de protocoles rationnels d'identification de loi de comportement élastoplastique :
Application à la simulation éléments finis d'opérations industrielles d'emboutissage

Abstract : The objective of the thesis carried out within the framework of the European project called "Intelligent system for NET shape FORming of Sheet MEtal Product" is the research of optimized procedures for the adjustment of numeric simulations for industrial operations of stamping.
The procedure puts forward the key role of the identification of the elastoplastic behaviour laws for metal sheet to assure a reliable simulation.
For this purpose, the traditional identifications of the constitutive laws from tensile tests are initially used.
Various techniques and protocols are retained to take the best advantages from this kind of tests, in particular using the experimental technique of optical analysis of deformation.
These choices lead to a notable improvement of the numeric results concerning the effect of the elastic spring-back, the state of residual stresses and the prediction of the strain localisation. However the limits of this kind of identification realized from homogeneous tests appear clearly.
This is the reason why we propose an original method of identification of the parameters of the behaviour law from heterogeneous tests close to the real case of sheet metal forming. The optimisation of the coefficients of the mechanical constitutive law is founded on the use of artificial neural networks. The advantages of this method are shown on an example of stamping of axisymmetric parts with blocked blank.
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https://tel.archives-ouvertes.fr/tel-00192731
Contributor : Olga Incandela <>
Submitted on : Thursday, November 29, 2007 - 11:52:26 AM
Last modification on : Friday, November 6, 2020 - 3:26:00 AM
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Olga Incandela. Définition de protocoles rationnels d'identification de loi de comportement élastoplastique :
Application à la simulation éléments finis d'opérations industrielles d'emboutissage. Modélisation et simulation. Université de Savoie, 2006. Français. ⟨tel-00192731⟩

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