Displacement based Simulation and Material Calibration based on Digital Image Correlation Part II - Application

An alternative approach to calibrate material models is proposed. The entire displacement field of a specimen measured with a DIC system was converted into boundary conditions by the Envyo® mapping software. These boundary conditions were imposed on all nodes in the corresponding LS-DYNA® simulation...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2023-06, Vol.1284 (1), p.12056
Main Authors: Ilg, C, Liebold, C, Sreenivasa, V, Haufe, A, Karadogan, C, Liewald, M
Format: Article
Language:English
Subjects:
Boundary conditions
Digital imaging
Digital twins
Iterative methods
Kinematics
Optimization
Parameters
Simulation models
Specimen geometry
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Summary:An alternative approach to calibrate material models is proposed. The entire displacement field of a specimen measured with a DIC system was converted into boundary conditions by the Envyo® mapping software. These boundary conditions were imposed on all nodes in the corresponding LS-DYNA® simulation model. In this way a digital twin of the specimen geometry and the experimental kinematics was obtained. Considering the local stress equilibrium over the entire specimen and the equilibrium of global force integrated over many hypothetical cross sections, LS-OPT® was used to iteratively determine the isotropic model parameters of the tested material. A new tensile specimen geometry is introduced to get the most out of a single test. The findings suggest that, at present, convergence in iterative parameter optimization cannot be attained without prior filtering and smoothing of the DIC input data in time and space, despite the utilization of the chosen material model.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1284/1/012056