Dynamic indentation testing and characterization of metals based on the split Hopkinson pressure bar (SHPB) device

Abstract

The classical quasi–static indentation testing theory and technique have been developed to a relatively mature degree, while the related studies on dynamic indentation testing and characterization are relatively few and incomplete but of significant importance in the actual conditions subjected to local dynamic loading. In this study, a dynamic indentation test device is established based on the split Hopkinson pressure bar test system. The “three–wave method” is proposed and validated through numerical simulations to effectively acquire the dynamic indentation response data (indentation depth and indentation load) of metallic materials, and dynamic indentation tests are carried out on the representative metal of oxygen free high conductivity copper (OFHC) with different striker velocities. Combining the dynamic indentation contact stiffness analysis with related indentation testing theory, the real–time dynamic indentation hardness of OFHC during the loading stage under different striker velocities are determined and certain rate sensitivity is shown. Related research lays a foundation for further studies on dynamic indentation testing and characterization of metals.