A. R. Sadeghi Chahardeh - M.Sc. Student, Mechanical Engineering Department, Sharif University of Technology, Tehran 11365-9567, Iran
R Naghdabadi - Professor, Mechanical Engineering Department and Institute for Nano Science and Technology, Sharif University of Technology, Tehran 11365-9567, Iran

Strain rate dependence of plastic yield and failure properties displayed by most metals affects energies, forces and forming limits involved in high speed forming processes. First, Split Hopkinson Tensile Bar (SHTB) experiments are carried out to determine the influence of the strain rate on the materials’ stress-strain curves. Then, the SHTB results are used to model the constitutive behavior of the metal sheets using the phenomenological Johnson-Cook (JC) model. Finally, Forming Limit Diagrams (FLDs) are calculated using the Marciniak-Kuczynski method. The results clearly show that the effect of the strain rate of forces and energies involved in a forming process, and the forming limits are non-negligible and strongly material dependent.

High strain rate, Sheet forming, Split Hopkinson Tensile Bar, Forming limit diagram