Abstract
The Photon Doppler Velocimetry (PDV) technique is used to capture simultaneously propagating elastic waves of longitudinal and shear nature in a Tension-Torsion Hopkinson Bar (TTHB) apparatus. The system uses a pair of probes per velocity measurement, which were taken on the opposite sides of the TTHB bar with a laser irradiated spot size of ~35 µm. The collected data were compared to the measurements obtained from the conventional strain gauge technique, and were in good agreement. The PDV method was effective in separating longitudinal and rotation signals even when they were superimposed on each other at the gauge location. This approach is also shown to be effective in detecting and accounting for the presence of bending waves in the TTHB bars.
Highlights
The split-Hopkinson pressure bar apparatus is a standard and widely used testing method for characterizing the high strain-rate behaviour of materials [1,2,3]
In the most common arrangement, the specimen is loaded by an incident pulse generated by an impact or a sudden release of stored energy traveling along the bar, where it is measured by a set of strain gauges
By assuming that the bars remain elastic during the test, the forces and velocities applied to the specimen can be found from the strain signals using an appropriate wave theory
Summary
The split-Hopkinson pressure bar apparatus is a standard and widely used testing method for characterizing the high strain-rate behaviour of materials [1,2,3]. In the most common arrangement, the specimen is loaded by an incident pulse generated by an impact or a sudden release of stored energy traveling along the bar, where it is measured by a set of strain gauges.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
