C30混凝土冲击绝热关系和Grüneisen型状态方程的实验研究

采用一级气炮加载技术和锰铜压力计测试技术，对含初始空隙的C30混凝土在一维应变条件下的冲击特性进行了实验测量和分析.基于锰铜压力计测量的压力波形，确定了C30混凝土材料的冲击绝热关系，即冲击波速度D与波后粒子速度u之间满足线性关系.再从C30混凝土的冲击绝热数据出发，获得了计及初始空隙度₀影响的多项式形式Grüneisen型状态方程中的各项系数.实测压力波形还显示：不同位置处的压力波形在迅速上升至峰值后均随时间逐渐衰减，而冲击波峰值又随传播 关键词： Grüneisen型状态方程 冲击绝热关系 混凝土

Experimental study on the shock Hugoniot relationship and the Gruneisen-type equation of state for C30 concrete

The shock properties of C30 concrete with initial porosity is investigated by gas gun planar impact technique. The manganin pressure gauge is used to measure the pressure-time curves of the samples. It is shown by the experimental studies on the shock Hugoniot relationship and the Grüneisen-type equation of state for C30 concrete that the D-u shock Hugoniot relationship is described by the linear relation, and the material parameters in the Grüneisen-type equation of state are determined. Moreover, it is observed from the measured pressure-time curves that the rate-sensitivity of dynamic response for C30 concrete is not negligible, showing marked stress relaxation and dissipation.