Estimation of Elastoplastic Parameters via Weighted FEMU and Integrated-DIC

Abstract : DIC-based identication of the constitutive parameters of an elastoplastic law is addressed both from a general viewpoint, and applied to the particular case of dog-bone sample made of commercially pure titanium and subjected to tensile loading. A two-step procedure (Digital Image Correlation DIC followed by weighted Finite Element Method Updating FEMU) is rst presented. These two steps can be merged into a single-step procedure (i.e., Integrated-DIC or I-DIC). In both cases, the elastoplastic computations are performed with a commercial code (i.e., non-intrusive iden-tication). When the suited weighting of FEMU is taken into account, which is based on DIC-processed image noise, both I-DIC and FEMU methods provide similar results. It is shown that the addressed experimental case requires the use of static (load) information to get precise estimates of the sought parameters .
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Florent Mathieu, Hugo Leclerc, François Hild, Stéphane Roux. Estimation of Elastoplastic Parameters via Weighted FEMU and Integrated-DIC. Experimental Mechanics, Society for Experimental Mechanics, 2015, 55 (1), pp.105-119. ⟨10.1007/s11340-014-9888-9⟩. ⟨hal-01166755⟩

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