Engineering Transactions, 59, 3, pp. 235–248, 2011

Dynamic Compression Tests – Current Achievements and Future Development

W. MOĆKO
Institute of Fundamental Technological Research Polish Academy of Sciences

Z. L. KOWALEWSKI
Institute of Fundamental Technological Research Polish Academy of Sciences; Motor Transport Institute

In this paper a modified arrangement of the DICT technique was introduced. Miniatur-
ization of bar and use of shadow principle to make a measurement of displacement allow to
obtain strain rate up to 2.2×105 s−1. Commonly used methods of elimination of friction, iner-
tia 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 5×10−4 s−1 to 103 s−1. The final true stress versus true strain curves
at different strain rates were corrected to a constant temperature and zero friction.
Keywords: direct impact compression tests, tantalum, Hopkinson bars, miniaturized arrangement
Full Text: PDF


Copyright © 2014 by Institute of Fundamental Technological Research
Polish Academy of Sciences, Warsaw, Poland