A Testing Machine for Two Stage Impact Loading and Some Experiments

摘要

A new impact testing machine was proposed, which was possible for various two stage impact loading tests 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 μs 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 μs and the present machine is valid as an 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.