Characterization of the post-necking strain hardening behavior using the virtual fields method |
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Authors: | J.-H. Kim,A. Serpantié ,F. Barlat,F. Pierron,M.-G. Lee |
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Affiliation: | 1. GIFT, Pohang University of Science and Technology, San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk 790-784, Republic of Korea;2. LMPF, Arts et Metiers ParisTech Rue Saint-Dominique, BP 508, 51006 Chalons-en-Champagne, France;3. Faculty of Engineering and the Environment, University of Southampton Highfield, Southampton SO17 1BJ, UK |
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Abstract: | The present study aims at characterizing the post-necking strain hardening behavior of three sheet metals having different hardening behavior. Standard tensile tests were performed on sheet metal specimens up to fracture and heterogeneous logarithmic strain fields were obtained from a digital image correlation technique. Then, an appropriate elasto-plastic constitutive model was chosen. Von Mises yield criterion under plane stress and isotropic hardening law were considered to retrieve the relationship between stress and strain. The virtual fields method (VFM) was adopted as an inverse method to determine the constitutive parameters by calculating the stress fields from the heterogeneous strain fields. The results show that the choice of a hardening law which can describe the hardening behavior accurately is important to derive the true stress–strain curve. Finally, post-necking hardening behavior was successfully characterized up to the initial stage of localized necking using the VFM with Swift and modified Voce laws. |
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Keywords: | Full-field measurement Virtual fields method Elasto-plastic behaviour Isotropic hardening Inverse problem Advanced high strength steel |
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