Finite Element Analysis of Formability of Metallic Sheets in High-Velocity Forming Processes

In this research, formability of metallic sheets is analyzed numerically, in high-velocity forming processes. At first, a finite element model is developed based on M-K theory in quasi-static condition and forming limit diagrams are predicted by means of this model. Then, numerical model is verified by comparison with experimental result which shows satisfactory agreement between them especially on the right side. Validated model is utilized to predict formability in high strain rates. Outcome forming limit diagram approves improvement of formability in high velocity processes up to 43% as well as reported behavior of Al3004 in high strains. In addition, in certain strain path critical strains are calculated from quasi-static condition to very high strain rates showing decline of formability in very high strain rates because of wave propagation phenomenon.