[en] The basic principle of the inverse modeling procedure as it is used for parameter identification is the generation of a complex and heterogeneous deformation field that contains as much information as possible about the parameters to be identified. One way of obtaining such a non-homogeneous deformation is by making the geometry of the specimen less regular. Another possibility is to make the loading conditions more complex. In this paper both options are actually combined by using the concept of a biaxial tensile test on a perforated cruciform specimen. In the present paper, the work hardening of the material is assumed to be isotropic and it is described by a Swift law. The yield locus is modeled by the anisotropic Hill48 criterion. The optimization technique used is a constrained gradient based Newton-type routine, which means that in every iteration step, a sensitivity calculation has to be performed in order to indicate the direction in which the parameters are to be optimized. The functional to be minimized is a least-squares expression of the discrepancy between the measured and the simulated strain fields at a certain load. The numerical routines as well as the identification results of the different parameters, based on simulated strain fields, are discussed.
Disciplines :
Civil engineering
Author, co-author :
Lecompte, D.
Cooreman, S.
Sol, H.
Vantomme, J.
Rabet, L.
Habraken, Anne ; Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
Language :
English
Title :
Identification of yield locus parameters of metals using inverse modeling and full field DIC
Publication date :
2006
Event name :
7th national congress on theoretical and applied mechanics
Event place :
Mons, Belgium
Event date :
29 et 30 mai 2006
Audience :
International
Main work title :
Proceedings of the 7th national congress on theoretical and applied mechanics
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