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Dynamic compression tests - current achievements and future development

Moćko W., Kowalewski Z. L.

Engineering Transactions

2011

Vol. 59, iss. 3

235-248

In this paper a modified arrangement of the DICT technique was introduced. Miniaturization of bar and use of shadow principle to make a measurement of displacement allow to obtain strain rate up to 2.2×105s-1. Commonly used methods of elimination of friction, inertia and adiabatic heating were presented. In order to estimate the rate sensitivity of a material (tantalum), quasi-static and SPHB tests were performed at room temperature within the rate spectrum ranging from 5×10-4s-1 to 103s-1. The final true stress versus true strain curvesat different strain rates were corrected to a constant temperature and zero friction.