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The split Hopkinson pressure bar (SHPB) testing method has been widely used to obtain dynamic compression properties of solid materials. In the experiment, the state of dynamic stress equilibrium and deforming at a nearly constant strain rate over most of the test duration should be achieved. Therefore, pulse shaping techniques are usually needed. A new method for SHPB incident pulse shaping is proposed in this paper. The material vacuum cement of which the strength can be ignored is used as the pulse shaper. The experimental results show that a satisfactory shaping effect can be obtained in a wide application scope with this method. The numerical simulation analysis indicates that the shaping function of vacuum cement is mainly due to the radial inertial effect in the high speed deformation process of the material.

A method of incident pulse shaping for SHPB