Results indicate that with the approximation of _ ( 0 ) _ ( 0 ) - grtlneisen equation of state is usable to describe the release isentrope of ofhc copper in the present pressure range . in addition , the difference ( w - 2u ) becomes greater with the increase of shock pressure , where w is the measured particle velocity at the final release state ( 1 atm ) and 2u is computed from the mirror line of hugoniot 卸载路径的计算和分析表明：在所研究的压力范围，无氧铜的等熵卸载过程用gr neisen状态方程在_ 0 _ 0 =近似下的描述是适用的；卸载到一个大气压的终态粒子速度w与镜像反演的粒子速度2u的偏差，随冲击波压力的增加而增大。
2.
High energy explosive was used to create a powerful and planar shock wave for accelerating flyer plate to high velocity , and high pressure was produced when flyer impacting with the sample . in the experiments , the impactor was brass and target was ofhc copper . by measuring the shock wave velocities of hr2 steel , high - density glass , aluminium alloy ( ly12 / lf6 ) , magnesium - aluminium alloy ( mb2 ) , polymethyl methacrylate and air , shock pressure and release isentrope of ofhc copper have been obtained 采用化爆加载、平面波发生器和空腔增压技术，以黄铜为飞片，无氧铜为靶板，测量了抗氢钢( hr2 ) 、重玻璃( sio _ 2 ) 、铝合金( ly12 lf6 ) 、镁铝合金( mb2 ) 、有机玻璃( pmma ) 、空气( air )和无氧铜( ofhccopper )各阻抗匹配样品中的冲击波速度，上述材料的hugoniot状态参数c _ 0 、均为已知，由此确定了无氧铜的冲击加载压力和等熵卸载后的状态，得到了等熵卸载路径。
