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Optimization of elastic material parameters of sheet metal with FEMU and DIC
Author(s) -
Schmaltz Stefan,
Willner Kai
Publication year - 2011
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201110208
Subject(s) - digital image correlation , orthotropic material , maxima and minima , sheet metal , deformation (meteorology) , displacement (psychology) , displacement field , convergence (economics) , finite element method , field (mathematics) , materials science , structural engineering , computer science , algorithm , mathematical analysis , mathematics , composite material , engineering , psychology , pure mathematics , economics , psychotherapist , economic growth
In this paper a deep‐drawing sheet steel is characterized through tensile tests with samples taken in different angles to the rolling direction. The displacement field is recorded with an optical full‐field measurement system and the deformation field is calculated by Digital Image Correlation (DIC). The orthotropic elastic material parameters are identified through an iterative parameter optimization via Finite Element Model Updating (FEMU). In this procedure the material parameters are modified in every iteration so that the numerically computed deformation field and forces match the measured values as well as possible. Depending on the objective function and the input values used in the optimization routine, global or only local minima exist. To show the convergence of the applied technique, two different optimization algorithms, one gradient‐based and one gradient‐free with different initial starting points were used. (© 2011 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)