Department of Physics

Department News

Physics Colloquium: Sept 03, 2010

Aug 30, 2010

A Modified Split-Hopkinson Pressure Bar

Speaker: Aaron Schye
Date: September 03, 2010 (Friday)
Time: 4 PM
Room: 205 Currens Hall

Abstract:

The conventional split-hopkinson pressure bar was modified to increase transmitted strain and improve signal quality when testing plastic materials. This was accomplished by replacing the solid transmitted bar with a hollow bar of equivalent diameter and length. Bar-to-bar tests using the conventional set-up were done to calibrate the apparatus and deduce the proper dispersion correction parameters. Polyurea, a shock absorbing material, was tested after the dispersion correction was adequately performed on the bar-to-bar data. The polyurea sample was then tested after implementation of the hollow transmitted bar. The results of the hollow bar test were compared to solid bar test and show that transmitted strain has doubled in the modified set-up. However, the geometry of the hollow bar caused difficulties in the dispersion correction and the signals could not be reconstructed as accurately as with the solid bar.

About the speaker: Aaron Schye is a graduate student of physics at Western Illinois University.