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• W1970740343 abstract "In this study, tensile loading experiments are performed on notched steel bars at an average applied strain rate of 1 s−1. Displacement fields are measured across the specimen by coupling digital image correlation (DIC) with imaging using high-speed CCD cameras (4796 fps). Results from the experiments indicate the presence of local strain rates ranging from 0.1 to 10 s−1 in the notched specimens. The heterogeneity of the strain rate fields provides suitable conditions for determining simultaneously all the elasto-visco-plastic constitutive parameters governing the material behavior. For that, the whole stress fields are reconstructed in the specimen using the full-field deformation measurements. This reconstruction is repeated with different constitutive parameters until the average stress in the specimen matches the one measured with the load cell response. Perzyna’s model is firstly considered for the reconstruction of stresses but it is shown to be unsuited for providing the drop in the average stress that is systematically detected at the onset of plasticity by the load cell. This drop is attributed to the sudden occurrence of plasticity in the material due to Lüders effect. A modified model for elasto-visco-plasticity taking account of Lüders behavior in the material is considered afterwards. It yields a better agreement between the reconstructed stresses and the load cell response, and a more accurate identification of the parameters driving the visco-plastic model. Eventually, it is shown how to use DIC measurements for replacing the load cell measurements when the transient effects in the test reach the resonance frequency of the load cell." @default.
• W1970740343 created "2016-06-24" @default.
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• W1970740343 date "2008-09-01" @default.
• W1970740343 modified "2023-10-18" @default.
• W1970740343 title "Identification of elasto-visco-plastic parameters and characterization of Lüders behavior using digital image correlation and the virtual fields method" @default.
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• W1970740343 doi "https://doi.org/10.1016/j.mechmat.2008.03.007" @default.
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