Abstract
The combined impact experiment at high strain rates is necessary to establish the dynamic constitutive equation. It seems that the experimental data for the purpose are not enough due to the difficulty of the experiment. In this research, a combined impact testing machine was proposed, which was possible for various combined impact test of tension and torsion. Especially, the testing machine can realize the impact loading and inverse loading in order to examine the Bauschinnger effect at high strain rates. This machine is based on SHPB method, and has two clamp devices that are released in the time lag of 100 μsec by connecting the two clamps to a rod. Using the testing machine, some efficiency tests were done. The results showed that the rise time of the impact load is about 50 μsec and the present machine is valid as a combined impact testing machine. Moreover, some impact experiments were conducted with short aluminum specimens. It was confirmed that the Bauschinnger effect appeared under the impact loading as same as the static loading.
