A Kolsky bar using a hollow incident tube
Tension testing in Kolsky bars has been used to determine dynamic material behavior since 1960. In the classical Kolsky compression bar, pulse shaping has been developed in order to subject the specimen to desired dynamic loading conditions. This usually entails dynamic equilibrium of the specimen. Pulse shaping methods in Kolsky tension bars have not matured as quickly as compression setups due to the complexity of loading methods and the gripping of the specimen. Developing an apparatus that can utilize the better-understood compression pulse shaping methods is then advantageous. A modified Kolsky tension bar where a hollow incident tube is used to carry the incident stress waves has been developed. The incident tube also acts as a gas gun barrel that houses the striker for impact. The striker impacts on the end of the incident tube through compression pulse shapers that are attached to the end cap. In order to accommodate free travel of the striker pressure-release slots are added to the tube. The effect of discontinuities on the stress pulse and interface interactions will be discussed. In order to validate the testing technique material behavior for Al 6061-T6511, AISI 4130 steel, and TWIP (Twinning Induced Plasticity) steel have been tested.
Chen, Purdue University.
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