M.S. (Master of Science)
Department of Mechanical Engineering
Since Bertram Hopkinson first raised the concept of Hopkinson pressure bar in 1914, many efforts have been taken by engineers and scholars for developing the system to measure the stress pulse propagation in metal bars for studying the properties of different materials under high strain rate deformation. The Northern Illinois University Material’s Lab has also built two generations of the split Hopkinson pressure bar (SHPB) system with the effort of several senior design teams in history.
The aim of this study is to develop the existing SHPB system of NIU to make it function properly. By redesigning the gun barrel, increasing the projectile diameter, changing the bar support design, and realigning the bars and gun barrel, the interference signals were removed from the real-time signal so that it can be used for the analysis of the tests under high strain rate deformation. For validation, several compressive tests were performed by using the updated system, and the obtained data were converted into stress-strain curve through calculation, which was imported into LS-DYNA for finite element analysis. By comparing the real test results and the simulation results, it was investigated that the real test result matches the simulation outputs so that the system can be used for the study under high strain rate loading conditions.
Zhu, Jiaqi, "Implementation of The Shpb System For Material Property Test Under High Strain Rate Deformation" (2019). Graduate Research Theses & Dissertations. 7807.
Northern Illinois University
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