Prediction of elastic strain recovery of a formed steel sheet considering stiffness degradation |
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Authors: | Miroslav Halilovič Marko Vrh Boris Štok |
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Institution: | (1) Laboratory for Numerical Modeling & Simulation; Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, Slovenia;(2) Kovinoplastika Lož, Stari trg pri Ložu, Slovenia |
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Abstract: | The aim of this work is to show first, how the springback of a steel sheet drawn part is affected by the stiffness degradation,
as it results from the damage evolved during forming process, and second, to build a respective modeling approach to take
this degradation into account. For the consideration of the orthotropic elastic properties degradation we develop an approach,
based on the Mori-Tanaka theory, where damage is considered by inclusion of ellipsoidal cavities. The respective void shape
evolution is proposed to be identified with the measurements of elastic modulus in two perpendicular directions during the
uniaxial tensile test of a flat specimen at different loading stages. The proposed approach is coupled with the Gurson-Tvergaard-Needleman
(GTN) plastic potential, though it could be substituted by almost any other continuum damage model. At the end the presented
approach is experimentally validated by a simple springback test, developed by authors. A very good agreement between by calculation
predicted and measured springback amount is observed. |
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Keywords: | Steel drawing Springback Damage Orthotropic properties Stiffness degradation |
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