Abstract
An international standard for high velocity tensile testing method is now constructing in ISO/TC164/SC1/WG7. One of the recommended testing methods is the one bar method, as well as the split Hopkinson pressure bar method. In 2002, Yoshida reported that output bar supporting methods for the one bar method are relatively sensitive to the accuracy in the initial peak behavior on steel stress-strain curves. With his testing machine, he found that the inordinately high initial peak could be suppressed by supporting the loading-end of the output bar moderately. On the other hand, in 2002, the present author succeeded to suppress the tremendous peak by changing the design of a specimen assembly. In this paper, two methods are compared and combined. Two kinds of the combinations may be recommended to suppress the tremendous peak.
