Determination of Anisotropic Plastic Constitutive Parameters Using the Virtual Fields Method
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The aim of the present study is to retrieve all the anisotropic plastic constitutive parameters from uniaxial loading. A complex geometry which can provide very heterogeneous stress states in a uniaxial tensile test was chosen for steel sheet specimens. A digital image correlation technique was used for the full-field heterogeneous strain measurement. The orthotropic Hill1948 yield criterion with Swift isotropic hardening was adopted as an elasto-plastic constitutive model. The virtual fields method (VFM) was employed as an inverse analytical tool to determine the constitutive parameters. All the parameters were successfully identified using the VFM by combining two tensile test results obtained in rolling and transverse directions.
KeywordsFull-field measurements Virtual fields method Plasticity Anisotropy Advanced high strength steel
The authors appreciate the support by POSCO. This work was supported by the NRF grant funded by the Korea government(MSIP) (No. 2012R1A5A1048294) and by the grants from the Industrial Source Technology Development Program (#10040078) of MKE.
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