Experimental Study of High Strain Rate Effects on Steel Sheet Forming

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Sadeghi Chahardeh, Alireza | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47117 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Naghdabadi, Reza
Abstract:
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. This paper investigates the influence of the strain rate on the forming properties of some industrial sheet metals used in Automotive and Aerospace industries. 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 behaviour of the metal sheets using the phenomenological Johnson-Cook (JC) and Voce models. 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
Keywords:
High Strain Rate ; Johnson-Cook Model ; Forming Limit Diagram (FLD) ; Marciniak-Kuczynski Model ; Split Hopkinson Tensile Bar (SHTB)Test ; Copper 10200 ; Sheet Steel 1010