Abstract
The current study examines the forming limit diagram (FLD) of Al 6061-T6 during the electrohydraulic forming process based on the Marciniak–Kuczynski theory (M-K theory). To describe the work-hardening properties of the material, Hollomon’s equation—that includes strain and strain rate hardening parameters—was used. A quasi-static tensile test was performed to obtain the strain-hardening factor and the split-Hopkinson pressure bar (SHPB) test was carried out to acquire the strain rate hardening parameter. To evaluate the reliability of the stress–strain curves obtained from the SHPB test, a numerical model was performed using the LS–DYNA program. Hosford’s yield function was also employed to predict the theoretical FLD. The obtained FLD showed that the material could have improved formability at a high strain rate index condition compared with the quasi-static condition, which means that the high-speed forming process can enhance the formability of sheet metals. Finally, the FLD was compared with the experimental results from electrohydraulic forming (EHF) free-bulging test, which showed that the theoretical FLD was in good agreement with the actual forming limit in the EHF process.
Highlights
Forming thin plate materials is limited by the occurrence of fractures and wrinkles
To in this study, to acquire theoretical forming limit diagram (FLD) during the electrohydraulic forming (EHF) process, the M-K theory was evaluate whether the obtained FLD can predict the actual forming limit of the plate, experimental used, and Hollomon’s stress–strain equation including strain-hardening and strain rate sensitivity results from the EHF process were compared to theoretical FLD
A theoretical FLD was obtained to evaluate the formability of sheet metals in electrohydraulic forming process
Summary
Forming thin plate materials is limited by the occurrence of fractures and wrinkles. In the case of uniaxial tensile deformation of the sheet, when the deformation is small, the plastic strain increases as the load increases. It is necessary to develop the theoretical FLD, for EHF was conducted to evaluate the material’s property obtained from the quasi-static tensile test which can consider strain rate variation in EHF. To in this study, to acquire theoretical FLD during the EHF process, the M-K theory was evaluate whether the obtained FLD can predict the actual forming limit of the plate, experimental used, and Hollomon’s stress–strain equation including strain-hardening and strain rate sensitivity results from the EHF process were compared to theoretical FLD. EHF was conducted to evaluate the includes material’s property obtained from and the quasi-static tensileindices, test andis used test to consider the sheet’s high strain rate on FLD and is and presented in EquationFinally,.
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