In this study, a dynamic torsion Split Hopkinson bar was developed and implemented to achieve shear strain rates of up to 10~4s~(-1). This device usually relies on the use of a cylindrical hollow specimen with arbitrary dimensions. The effect of such dimensions on the obtained results (stress-strain curves) was investigated. Steel specimens of AISI 4340 steel were tested at strain rates ranging from 200 s~(-1) to 2,000 s~(-1). The outside diameter, the inside diameter and the length of the thin walled section of the specimens were changed. It was found that a parameter consisting of the product of the polar moment of inertia and length of specimen has a significant influence on the shear failure mode.
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