磁驱动斜波加载下铁的强度数据处理与实验研究

Yield strength measurement of material under ramp wave loading to high pressure is a newly developed technique in recent years, and it has attracted the focus of international weapon laboratories. Up to date, the ramp wave loading technique, laser interference measurement technique, and experimental data process method are in great developing. In this application, aiming at the difficulty of experimental data process of yield strength measurement for phase transition material under ramp wave loading, we intend to establish a reliable data processing method based on forward-backward iteration and Transfer Function Method(TFM). Yield strength and sound speed of iron below and above the α→εtransition pressure are planned to investigate using the compact pulsed power generator CQ-4. The establishment of strength measurement technique for phase transition material under ramp wave loading will play an important role in the investigation of high pressure behaviors of phase transition material.

采用磁驱动斜波压缩测量材料的高压强度是近几年才发展起来的一种新的实验技术，获得了国外武器实验室的高度重视，相关的实验加载技术、测试技术、数据处理方法等方面发展十分迅速。本申请针对磁驱动斜波加载下相变材料强度数据处理的困难，拟采用正反迭代并联合转换函数法，建立相变材料的高压强度数据处理方法，并基于磁驱动斜波加载装置CQ-4，开展纯铁在α→ε相变前后的高压声速和强度研究，相关实验技术的建立，将为我们后续开展相变材料的高压物性研究奠定基础。

本项目针对斜波压缩实验数据处理的困难，提出了基于特征线方法的斜波压缩实验数据的正向Lagrange处理方法，并发展了转换函数方法在斜波压缩实验数据正向Lagrange处理中的应用。考核了转换函数方法使用的限制条件，并将其应用于非相变材料和相变材料的磁驱动斜波压缩实验数据分析。基于磁驱动准等熵压缩装置CQ-4，开展了铁的斜波压缩实验，获得了铁台阶样品在α→ε转变相区的速度剖面，通过对速度数据的处理，获得了纯铁材料在高压下的声速和强度数据。