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Development Of A Tensile Split Hopkinson Pressure Bar Testing Facility, Kevin Young
Development Of A Tensile Split Hopkinson Pressure Bar Testing Facility, Kevin Young
Electronic Theses and Dissertations
This project consisted of designing and developing a split Hopkinson pressure bar (SHPB) apparatus to perform tensile tests on metallic sheet materials at strain rates from 500 s-1 to 2000 s-1. The mechanical components that were designed and built are: a gas gun, incident/transmission bars and a momentum trap. A data acquisition system with two data acquisition cards with a maximum sampling rate of up to60 MS/s was used. This apparatus was successfully assembled, calibrated and tested. A software code was developed to post-process the experimental strain data and determine the corresponding flow curves. The accuracy of this tensile SHPB …
Investigation Of The Formability Enhancement Of Dp600 Steel Sheets In Electrohydraulic Die Forming, Jia Cheng
Investigation Of The Formability Enhancement Of Dp600 Steel Sheets In Electrohydraulic Die Forming, Jia Cheng
Electronic Theses and Dissertations
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 …