无氧铜等熵卸载路径的实验研究

 采用化爆加载，以黄铜为飞片、无氧铜为靶板，测量了以抗氢钢（HR2）、重玻璃（SiO₂）、铝合金（LY12/LF6）、镁铝合金（MB2）、有机玻璃（PMMA）和空气（Air）为垫块（Anvil）材料中的冲击波速度（上述材料的Hugoniot状态参数C₀、λ均为已知），由此确定了无氧铜的等熵卸载路径。结果表明：在冲击态（即初始卸载态）高达219 GPa的压力范围内，无氧铜的等熵卸载过程可用Grüneisen状态方程在ργ=ρ₀γ₀近似下作很好的描述；各条卸载路径到一个大气压的终态粒子速度U_S与镜像反演的粒子速度2u的偏差(U_S-2u)/(2u)，随冲击波压力的增加而增大。

Experimental Investigation of the Release Isentropes for OFHC Copper

The release isetropes of oxygen-free copper have been measured by explosive loading technique, in which brass is used as the flyer material, copper as the material both for baseplate and sample, and HR2-steel, SiO₂-heavyglass, LY12/LF6 Al, MB2 alloy, PMMA and air as the anvil materials. The results showed the measured release isentropes can be described through Grüneisen equation of state with constant ργ approximation in the initial releasing pressure range up to 219 GPa, and the relative deviation, (U_S-2u)/(2u), of the measured end particle velocity, U_S, with the value of the mirror-line approximation, 2u, increases with increasing initial releasing pressure.