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Data from a Torsion Split-Hopkinson Bar Experiment

Sample data from a torsion SHB experiment on a half-hard (H02) C464 brass specimen are shown below in Figure 1, Figure 2 and Figure 3.    Figure 1 presents wave data from the experiment.   Shear stress, shear strain rate and shear strain in the specimen are plotted versus time in Figure 2.  Figure 2 shows that the shear strain rate is relatively constant at 5000.0 s-1 after a 50 microsecond rise time.  The resultant shear stress versus shear strain curve is shown in Figure 3. 

Three dimensional digital image correlation can be used to measure the surface strains of a specimen loaded with this apparatus.  Surface strains of an UFG (Ultra-Fine Grain) aluminum specimen tested on the torsion SHB are shown in Figure 4.

Figure 1. Wave data from a torsion SHB test.

 

Figure 2. Reduced history data from a torsion SHB test.

 

Figure 3. Shear stress versus shear strain curve determined from a torsion SHB test.

 

Figure 4. Shear strain contour on the surface of an UFG aluminum spool specimen from a torsion SHB experiment.