Mg-W体系密度梯度飞片复杂加载实验的计算分析

采用弹塑性流体动力学计算方法对Mg-W体系密度梯度飞片复杂加载实验进行计算设计,考虑到飞片材料制备中单层厚度值和Mg-W最大阻抗混合质量百分数的致密条件限制, 提供12层Mg-W体系飞片的制备参数. 采用研制的梯度飞片在气炮上进行冲击加载-准等熵加载实验, 给出了飞片和LiF窗口界面处速度剖面的VISAR或DISAR实验测试结果, 并通过数值计算对实验数据进行对比, 对出现的异常现象进行了分析和实验验证, 提出以Mg-Cu为飞片材料体系的建议, 为后续深入开展可控加卸载路经和可控加卸载速率的实验研究奠定了基础. 

CALCULATION AND ANALYSIS OF THE Mg-W GDI COMPLEX LOADING EXPERIMENT

A Mg-W material system graded density impactor (GDI) for the complexity loading experiment was designed by means of numerical simulation with elastic-plastic fluid dynamics calculation method. By considering the technical restriction of minimum thickness of a discrete layer and the limitation of compact condition in maximum mixing rate between the two individual constituents in the actual material fabrication, a set of preparation parameters for twelve-different-constituent Mg-W system GDI are given. One experiment of shock loading and quasi-isentropic compression for the presented GDI on a gas gun was performed. And the velocity of interface between the flyer and LiF window was provided by VISAR or DISAR technology. Through the comparison between the computational results and the experimental data, analysis and verification are implemented for singular phenomena. As a result, a proposal using Mg-Cu material system to fabricate the flyer is put forward. The project is helpful for the further experimental study with loading/unloading controllable path and controllable rate.