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Data From a Tension Split-Hopkinson Bar Experiment

Sample data from a tension SHB experiment on a 2024-T351 aluminum specimen are shown below in Figure 1, Figure 2 and Figure 3.    Figure 1 presents wave data from the experiment.   Engineering stress,  strain rate and engineering strain in the specimen are plotted versus time in Figure 2.  Figure 2 shows that the shear strain rate is relatively constant at 500.0 s-1 after a 40 microsecond rise time.  Engineering and true stress versus strain curves are 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 a titanium alloy (Ti-6Al-4V) specimen tested on the tension SHB are shown in Figure 4. The region of high strains in the center of the specimen is clear evidence of a necking localization.

Figure 1. Wave data from a tension SHB experiment.

 

Figure 2. Reduced history data from a tension SHB experiment.

 

Figure 3. Stress versus strain data from a tension SHB experiment.

 

Figure 4. Surface strains of a Ti-6Al-4V specimen tested on the tension SHB apparatus.