Numerical Simulation Analysis of Real-Time High-Temperature Impact Test Technique of Rock Materials

The exploration of the high-temperature and high-strain-rate mechanical properties of rock materials has consistently been an important goal in the field of rock dynamics. Consequently, high-temperature split Hopkinson pressure bar (SHPB) test technology has been a focal point and difficulty in the research of related fields, and there remain many problems to be solved. This paper puts forward a self-developed, high-temperature SHPB device and introduces the composition and working principles of a high-temperature impact loading test system for rock materials. A set of test operation rules for the independent heating, high-temperature compensation, and synchronous assembly of test pieces is established. Via Ansys/LS-DYNA software, the characteristics of stress wave propagation in the bar and its temperature field distribution are analyzed, and the controllability of the specimen and temperature of the bar end, as well as the effectiveness of the high-temperature loading test technology, are demonstrated.