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A full-field optimization approach for iterative definition of yielding for non-quadratic and free shape yield models in plane strain
(2020)IOP Conference Series: Materials Science and EngineeringAn advanced strategy for iterative definition of initial yielding based on planar strain distribution is presented. It is shown that full-field DIC measurement of NTR5 samples provides information on initial yielding for plane strain. The interdependency of strain increment and yield locus under assumption of associated flow allows for definition of yield parameters using a non-linear optimization scheme with LS-OPT. Pivotal for research ...Conference Paper -
Considering fluctuations of material properties, stainless steel 1.4301, on manufacturability of kitchen sinks
(2018)IOP Conference Series: Materials Science and EngineeringIn production of deep drawn sheet metal parts, it is often challenging to achieve a robust process. Especially in the production of kitchen sinks made out of stainless steel, the fluctuation of the process and material properties often lead to robustness problems. Therefore, numerical simulations are used to detect critical regions. To keep a constant product quality, process control is realised based on metamodels, which are computed by ...Conference Paper -
A failure model for non-proportional loading under plane stress condition based on GFLC in comparison to eMMFC and PEPS
(2018)IOP Conference Series: Materials Science and EngineeringA mathematical model is presented for a forming limit for non-proportional loading under plane stress condition. The model results in an approach to reduce the number of experiments needed for the Generalized Forming Limit Concept (GFLC) and presents a numerical approach to calculate the linearized FLC from real Nakajima measurements. The mathematical model has been analyzed in comparison to Polar Effective Plastic Strain (PEPS) diagram ...Conference Paper -
On the prediction of yield loci based on crystal plasticity models and the spectral solver framework
(2018)Journal of Physics: Conference SeriesPrediction of the yield loci based on crystal plasticity material models in combination with an efficient solver, the FFT-based spectral solver, is the main focus of this study. Results of the CP-based yield locus modeling are compared with the well-established macroscopic model YLD2000-2d for various materials; steel as well as aluminum alloys. For this purpose, uniaxial tensile tests in various directions as well as biaxial tests were ...Conference Paper -
Crystal plasticity as complementary modelling technique for improved simulations results of anisotropic sheet metal behaviour in forming processes
(2020)IOP Conference Series: Materials Science and EngineeringThe accuracy of the simulation results in terms of metal sheet forming strongly depends on the capability of modelling the anisotropic material behaviour. In addition, predictive capabilities of the models are strongly influenced by the way how the constitutive model parameters are calibrated. Macroscopic models lean towards to become more complex in order to map the material behaviour more precisely. As consequence the amount and complexity ...Conference Paper