Characterisation and validation of material models for thin sheet materials using MUC tests

• Applicant: Professor Dr.-Ing. Wolfram Volk
• Subject Area: Primary Shaping and Reshaping Technology, Additive Manufacturing
• Term: since 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 540145846

In sheet metal forming, the importance of predicting feasibility through numerical analysis is constantly increasing. Compared to the trial and error method, CAE programs enable a faster and more cost-efficient evaluation of forming processes. However, a reliable prediction of the formability of sheet metal components requires an adequate description of the sheet metal material. An essential step before using a material model is to validate it, taking into account the material and the forming process. Only after validation is it possible to ensure that the material model meets the requirements. Based on the preliminary work of the DFG predecessor project, the validation strategy investigated therein and the associated test are to be transferred to thin sheet metal materials and put into practice as part of the transfer project. In addition to specific adjustments to the validation test and the associated evaluation routine with regard to the properties of thin sheet materials (e.g. clamping, tribological system, sample geometry), a virtual laboratory based on crystal plasticity simulations will be used in the research project. This makes it possible to model the thin sheet materials (often with only a small number of grains above the sheet thickness) in an alternative way to macroscopically determined material properties. For the final evaluation of the potentials and limits of the developed characterization and validation method, a multi-stage forming process of a two-piece food can is simulated and the numerical results are compared with experiments.

• DFG Programme: Research Grants (Transfer Project)
• Application Partner: thyssenkrupp Rasselstein GmbH
• Co-Investigator: Dr.-Ing. Christoph Hartmann
• Cooperation Partner: Dr.-Ing. Alexander Butz