冲击-斜波加载下锆的动力学特性

本文基于磁驱动装置CQ-4完成了冲击-斜波加载实验设计,开展了金属锆在不同加载条件下先冲击再斜波压缩新热力学路径下的动力学特性研究.实验结果显示,加载压力峰值约为25 GPa,三个样品的波剖面结构依次为弹塑性转变、冲击波和斜波压缩,当冲击加载压力在相变压力附近约10 GPa时可以获取含有明显相变特征的速度波剖面,而冲击压力在20 GPa时冲击波覆盖相变波,速度波剖面无法观测到10 GPa附近的双波结构.加载压力峰值约为44 GPa,速度波剖面无弹塑性转变和相变特征为单波结构.结合多相状态方程和非平衡相变速率方程对锆的冲击-斜波压缩过程进行了数值模拟,计算与实验结果吻合良好,可以较好地模拟锆的冲击-斜波压缩实验过程.

Kinetics of Zr under shock-ramp compression

The dynamics of Zr under shock-ramp wave loading was studied with experiments and simulations.The shock-ramp wave compression experiments of Zr with different loading thermodynamics path were carried out with photonic Doppler velocimetry(PDV)and compact pulsed power generator CQ-4.The velocity wave profiles show that Zr undergoes shock and then ramp wave compression in the loading section.When the shock pressure reaches about 10 GPa,the velocity profile contains phase transition information.However,the phase transition information could not be observed when the shock pressure is up to 25 GPa.It is a single shock wave when the shock pressure is at 44 GPa.The experimental results are simulated with the Hayes multi-phase equation of state and the non-equilibrium phase transition kinetic model,which can well describe the physical processes of the elastoplastic transition and the phase transition in the loading section.