Model Integration for Process Simulation

Funding: German Research Foundation (DFG)
Project: CRC/TRR 188 • Subproject S01
Contact: Alexander Schowtjak M. Sc.

Numerical simulations are used in order to optimally design forming processes in the CRC/TRR 188.

The prediction of damage in the sense of void fractions is of special importance for the product performance. In order to predict the damage realistically, a methodology for model calibration has been developed based on experimentally measured void fractions. While a similar procedure for the Gurson-Tvergaard-Needleman-model is already established, this strategy has been extended to be generally applicable.

The figure depicts the simulation results with the Lemaitre model for a classical parameter identification process compared to the newly developed strategy. While there is barely any difference between those curves (see Figure a), there are large differences in the void evolution D of an air bending process (see Figure b). The results for the strategy based on void measurements depict the experimental data well, whereas there are large differences for the conventional strategy.

a) Results of the parameter identification process, b) Validation in terms of air bending