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Estimation of Elastoplastic Parameters via Weighted FEMU and Integrated-DIC

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Abstract

DIC-based identification 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 first 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 identification). 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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Acknowledgments

It is a pleasure to acknowledge the support of Région Ile de France (“FRESCORT” and “DICCIT” projects).

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  1. Laboratoire de Mécanique et Technologie (LMT-Cachan), ENS Cachan CNRS PRES UniverSud Paris, 61 Avenue du Président Wilson, 94235, Cachan Cedex, France

    F. Mathieu, H. Leclerc, F. Hild & S. Roux

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  1. F. Mathieu
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Correspondence to F. Mathieu.

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Mathieu, F., Leclerc, H., Hild, F. et al. Estimation of Elastoplastic Parameters via Weighted FEMU and Integrated-DIC. Exp Mech 55, 105–119 (2015). https://doi.org/10.1007/s11340-014-9888-9

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