June 23, 2013
June 23, 2013
June 26, 2013
23.1007.1 - 23.1007.21
Providing Learning Opportunities by Designing a Split Hopkinson Pressure BarSenior students are always challenged to apply their engineering knowledge and research skillsgained from an engineering curriculum toward design and implementation of challenging seniordesign projects. Split Hopkinson pressure bar is an apparatus that is used to study materialsbehavior under high speed deformation, where strain rate is very high. Hopkinson bars areusually custom made based on the needs of customers, who are mostly researchers in universitiesor research labs. In this work, the authors provided learning opportunities for engineeringstudents to design a small size split Hopkinson pressure bar in a form of senior design project.The objectives of this project are to engage students: 1) to design a well-structured Hopkinsonbar by means of solid mechanics fundamentals and finite element simulation 2) to build aworking prototype of the apparatus designed for future research activities; and 3) to develop highspeed deformation experiments for instructional purposes. The designed Split Hopkinson barconsists of two metallic bars with a specimen placing in between, a striker assembly, an aircompressor, an instrumentation and data acquisition system. The experiments for using the splitHopkins bar are conducted as an impact is made by the striker on one of the bars, whichgenerates stress wave through the specimen and the other bar. During the experiments, strain inspecimen is determined by measuring strains on the bars using strain gauges mounted on thebars.Students implemented the fundamentals of solid mechanics to design the apparatus. Studentsalso built the solid model of the apparatus using CAD software and validated the design byextensive finite element simulation. A working prototype was physically built and tested.Preliminary tests demonstrate that the performance of the apparatus is as desired. In this paper,the authors elaborate on how the students have utilized the extensive engineering knowledgeacquired throughout the course to design and develop this Hopkinson pressure bar and thus theeducational gains achieved. This work is supported by an NSF’s CMMI (Civil, Mechanical andManufacturing Innovation) program.
Dyab, M., & Matin, P., & Jin, Y. (2013, June), Providing Learning Opportunities by Designing a Split Hopkinson Pressure Bar Paper presented at 2013 ASEE Annual Conference & Exposition, Atlanta, Georgia. https://peer.asee.org/22392
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