Identification of plastic constitutive parameters at large deformations from three dimensional displacement elds
Article dans une revue avec comité de lecture
Abstract
The aim of this paper is to provide a general procedure to extract the constitutive parameters of a plasticity model starting from displacement measurements and using the Virtual Fields Method. This is a classical inverse problem which has been already investigated in the literature, however several new features are developed here. First of all the procedure applies to a general three-dimensional displacement eld which leads to large plastic deformations, no assumptions are made such as plane stress or plane strain although only pressure-independent plasticity is considered. Moreover the equilibrium equation is written in terms of the deviatoric stress tensor that can be directly computed from the strain eld without iterations. Thanks to this, the identi cation routine is much faster compared to other inverse methods such as nite element updating. The proposed method can be a valid tool to study complex phenomena which involve severe plastic deformation and where the state of stress is completely triaxial, e.g. strain localization or necking occurrence. The procedure has been validated using a three dimensional displacement eld obtained from a simulated experiment. The main potentialities as well as a rst sensitivity study on the inuence of measurement errors are illustrated.
Files in this item
Related items
Showing items related by title, author, creator and subject.
-
Article dans une revue avec comité de lectureCOMMIN, Loreleï; ROTINAT, René; PIERRON, Fabrice; DUMONT, Myriam; MASSE, Jean-Eric; BARRALLIER, Laurent (Elsevier, 2011)AZ31 hot rolled magnesium alloy presents a strong basal texture. Using laser beam welding (LBW) as a joining process induces high temperature gradients leading to major texture changes. EBSD was used to study the texture ...
-
Article dans une revue avec comité de lectureMOULART, Raphaël; PIERRON, Fabrice; HALLETT, Stephen R.; WISNOM, Michael R. (Society for Experimental Mechanics, 2011)The present paper deals with full-field strain measurement on glass/epoxy composite tensile specimens submitted to high strain rate loading through a split Hopkinson pressure bar (SHPB) device and with the identification ...
-
Article dans une revue avec comité de lectureMOULART, Raphaël; AVRIL, Stéphane; PIERRON, Fabrice (Elsevier, 2006)In this paper, a novel experimental procedure is carried out for providing all the through-thickness rigidities of a thick glass-epoxy laminated ring cut from a tube, using only one diametral compression ...
-
Communication avec acteMOULART, Raphaël; PIERRON, Fabrice; HALLETT, Stephen R.; WISNOM, Michael R. (EDP Sciences, 2009)The present paper deals with full-field strain measurement on open-hole tensile specimens submitted to high strain rate through a Hopkinson bar device. After having briefly explained the methodology (using an Ultra-High ...
-
Article dans une revue avec comité de lectureMOULART, Raphaël; ROTINAT, René; PIERRON, Fabrice; LERONDEL, Gilles (Elsevier, 2007)In order to extend the application range of the so-called ‘‘grid method’’ to the micron cale and thus quantitatively characterize the micromechanical behavior of metallic alloys, we report in this paper on the optimization ...