Fredenburg D A, Koller D D, Rigg P A, Scharff R J
Los Alamos National Laboratory, Shock and Detonation Physics, Los Alamos, New Mexico 87545, USA.
Rev Sci Instrum. 2013 Jan;84(1):013903. doi: 10.1063/1.4774394.
An experimental technique and analysis methodology for obtaining high-fidelity Hugoniot measurements with defined uncertainty bounds on powder compacts using optical velocimetry is presented. Impedance matching is used to calculate the shocked state in the powder from the measured initial compact density, ρ(00), impact velocity, V(Imp), and shock velocity, U(S). Detailed characterization of the powder thicknesses at precise locations results in improvements in characterization of the initial density state and accurate measurements of the powder thickness at locations corresponding to shock velocity measurements. These measurements result in high accuracies in the equilibrium Hugoniot state and reduced uncertainties in the measured and calculated Hugoniot parameters. Assumptions in this analysis include a constant and homogeneous initial porous density, and steady state wave propagation. The approach is applied to a system of CeO(2) powder pressed to 4.0 g/cm(3) (55% theoretical maximum density), and results indicate a complex dynamic response.
提出了一种利用光学测速技术在粉末压坯上获得具有确定不确定度界限的高保真雨贡纽测量值的实验技术和分析方法。通过阻抗匹配，根据测量得到的初始压坯密度ρ(00)、撞击速度V(Imp)和冲击速度U(S)来计算粉末中的冲击状态。在精确位置对粉末厚度进行详细表征，可改善对初始密度状态的表征，并在与冲击速度测量相对应的位置准确测量粉末厚度。这些测量结果使得平衡雨贡纽状态具有高精度，并降低了测量和计算得到的雨贡纽参数的不确定性。该分析中的假设包括初始多孔密度恒定且均匀，以及稳态波传播。该方法应用于压制到4.0 g/cm³（理论最大密度的55%）的CeO(2)粉末系统，结果表明其具有复杂的动态响应。
