Abstract
In the present study, newly developed two-stage split Hopkinson pressure bar method for constant deformation rate has been proposed. Based on the one dimensional stress wave theory two kinds of arrangement of systems are investigated. Since the flow stress of a specimen is changed with strain, the strain rate during high velocity deformation is generally changed when a constant amplitude incident wave is applied. Therefore, a buffer of identical material to a specimen is provided and is deformed by impact. In the method, the stress wave to deform the buffer and the constant amplitude stress wave are superposed as the incident wave for the constant deformation rate test. Dimensional requirements for the buffer and the test piece are fully discussed together with mechanical impedance and sectional area of respective components of the system. Numerical simulations are carried out to identify the new method and availability of the method is confirmed.
