关键词: 珊瑚砂, 压导式连续电阻探针, 化爆加载, 冲击Hugoniot曲线, 阻抗匹配

Abstract: Coral sand is widely used in military protection projects of islands because of its convenience and well anti explosion buffering performance. It is necessary to obtain the shock Hugoniot data of coral sand before investigating the shock equation of state under high pressure. This paper developed a shock wave test system for multi-material based on continuous pressure-conducted electrical resistance probe, by which the detonation wave and shock wave time history curves of explosives, standard material and tested material can be determined in a explosion test. Then the shock Hugoniot curve of the tested material could be calculated based on the impedance matching principle. After that, a feasibility test was carried out using water as the tested material to verify the reliability of the method. Finally, the shock Hugoniot curve of coral sand, represented by shock wave pressure P and particle velocity Up, was determined with the present method, which was compared with the Hugoniot data of quartz sand. The experimental results show that, it is convenient and reliable to determine the shock Hugoniot curve of tested material based on the continuous testing system of multi-material shock waves and impedance matching principle. The presented exploration work provides a supplement to the experimental research of the shock equation of state for large-scale heterogeneous materials.

Key words: coral sand, continuous pressure-conducted electrical resistance probe, explosive loading, shock Hugoniot curve, impedance matching