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A platform for research: civil engineering, architecture and urbanism
Investigation of the Formability Enhancement of DP600 Steel Sheets in Electrohydraulic Die Forming
The objectives of this thesis are to quantify the increase in formability of DP600 steel sheets in electrohydraulic die forming (EHDF) and describe the mechanisms that lead to a formability enhancement. Marciniak tests and EHDF tests were conducted to obtain the conventional and EHDF forming limit curves of this sheet material, respectively. EHDF tests with a V-shaped die indicated that, globally, there was no formability improvement; however a 100% improvement was achieved locally near the apex of the specimen. A formability enhancement of over 75% can be achieved in EHDF with a conical die, provided the discharge energy is sufficient (≥12.5 kV). Numerical simulations of these tests showed that the combination of high strain rate and inertial effects helps to delay the onset of necking prior to the sheet contacting the die. But contact phenomena play an even more significant role to improve sheet formability by decreasing the stress triaxiality.
Investigation of the Formability Enhancement of DP600 Steel Sheets in Electrohydraulic Die Forming
The objectives of this thesis are to quantify the increase in formability of DP600 steel sheets in electrohydraulic die forming (EHDF) and describe the mechanisms that lead to a formability enhancement. Marciniak tests and EHDF tests were conducted to obtain the conventional and EHDF forming limit curves of this sheet material, respectively. EHDF tests with a V-shaped die indicated that, globally, there was no formability improvement; however a 100% improvement was achieved locally near the apex of the specimen. A formability enhancement of over 75% can be achieved in EHDF with a conical die, provided the discharge energy is sufficient (≥12.5 kV). Numerical simulations of these tests showed that the combination of high strain rate and inertial effects helps to delay the onset of necking prior to the sheet contacting the die. But contact phenomena play an even more significant role to improve sheet formability by decreasing the stress triaxiality.
Investigation of the Formability Enhancement of DP600 Steel Sheets in Electrohydraulic Die Forming
Cheng, Jia (author)
2015-07-11
Electronic Theses and Dissertations
Theses
Electronic Resource
English
DDC:
690
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