【摘要】 利用激光驱动带窗口宏观高速飞片技术可以实现对材料的一维加载,特别适合开展材料的高压状态方程及高应变率下材料的动态力学特性研究。利用小型脉冲YAG激光器进行了驱动飞片技术研究。开展了飞片结构对飞片力学参数影响的实验,结果表明:复合靶飞片的能量耦合效率比单膜结构飞片具有较大的提高,平均速度提高约15%~30%。同时,飞片的平面性和完整性也有明显的改善。实验中测量了飞片的启动弛豫时间,结果显示:飞片的启动弛豫时间为5~10 ns。利用多通道光纤阵列开展了飞片的平面性测量。实验结果表明,在约1.0 mm的范围内,飞片的时间分散性为20~30 ns。利用高灵敏度激光干涉技术,对飞片速度历史进行了测量,结果表明,飞片在前20 ns就加速到最终速度的90%以上。更多还原

【Abstract】 One-dimensional shock loading on the material can be realized using the technique of laser-driven macro-flyer plate and is of applications to the research of high pressure equation of state(EOS) and dynamics under high strain rate.A table-sized pulse Nd:YAG laser was used to drive macro-flyer in this work.The influence of flyer configuration on its flying parameters was experimentally researched.The experiments show that the energy coupling efficiency of flyer plates in complex configuration is improved,relative to the single foil configuration which the average velocity of flyer plates is enhanced by 15%~30%,furthermore,the integrity and planarity of flyer plates in complex configurations are better than those from single foil configurations.The startup relaxation time of flyer is measured to be within 5~10 ns.The planarity of flyer was measured and the results show that time difference of flyer in the range of 1.0 mm is within 20~30 ns.The flyer velocity history was measured and the results show that the flyer has been accelerated to 90% of its terminal velocity in 20 ns.更多还原