A novel approach to torsional Kolsky bar material testing with pulse-shaping capabilities




York, Jason R.

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The Kolsky bar, or split-Hopkinson bar, method is commonly used to examine the response of materials under dynamic conditions. As the properties of many materials are known to exhibit strain-rate dependence, accurate testing of materials under appropriate conditions is required to generate reliable models. The Kolsky bar method has been adapted to test materials in compression, tension, and torsion. However, they are mostly applicable to high-impedence materials, capable of withstanding large strains before failure. The recent development of pulse-shaping techniques, a method of modifying the applied dynamic load, has allowed Kolsky bar apparatuses to be used in the testing of low-impedence and brittle materials. These techniques have also improved the controllability of test conditions, ensuring dynamic equilibrium and strain-rate consistency. Currently, the utilization of pulse-shaping has been widely limited to tensile and compressive systems, as the most commonly used torsion design provides no means of integrating such techniques. This work presents an alternative torsional Kolsky bar design with pulse-shaping capabilities. A detailed design description is provided, as well as collected data displaying the system's ability to test materials at high strain-rates and modify loading implementing pulse-shaping.


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Kolsky, Split-Hopkinson



Mechanical Engineering