Direct calculation method for free surface data processing of step target in ICE
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摘要: 斜波压缩台阶靶实验中，不同厚度界面粒子速度历史与材料压缩特性参数存在联系。然而利用普遍采用的数据处理方法无法直接获得该联系。本文中借助特征线理论在建立上述关联的基础上，实现未知EOS下斜波压缩流场的直接计算过程。经数值计算表明，该方法不仅在无强度效应数据处理中能够准确计算理论值，而且在含有强度效应数据处理中也能够较好地逼近理论值，并可在真实实验数据处理中获得与文献符合较好的结果。该研究可为探索具有较完整理论的强度效应数据处理方法提供新途径。Abstract: In ramp compression experiments, the velocity history of the interface particles with different thicknesses correlates with the parameters of the material compression characteristics. However, there is no direct access to reveal this relationship using conventional data processing methods. In this article, a correlation was established based on the characteristic line theory, and the ramp compression flow field with unknown EOS could be directly calculated. And numerical experiments show that this method can not only accurately calculate the theoretical value in the data processing without strength effect, but also approximate the theoretical value in data processing with strength effect. And, in the real experimental data processing, the results produced by this method are in good agreement with the literatures. This research provides a reliable new way to explore the strength effect data processing method with complete theory.
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Key words:
- ramp compression /
- characteristic method /
- sound speed /
- in-situ particle
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图 2 加载面速度历史和两个样品自由面速度历史
Figure 2. The input data of loading surface velocity history and the free surface velocity history by calculation
图 4 声速与原位粒子速度关系比对（利用自由面速度上升段速度历史数据）
Figure 4. Comparison of sound speeds between different methods (from the rising section of the free surface velocity history curves)
图 5 声速与原位粒子速度关系比对（利用自由面速度历史下降段历史数据）
Figure 5. Comparison of sound speeds between different methods (from the falling section of the free surface velocity history curves)
图 6 LSDYNA计算获得速度历史（考虑了强度）
Figure 6. Free surface velocity history with strength effect calculated by LSDYNA
图 7 声速与原位粒子速度关系曲线的对比结果
Figure 7. Comparison of the relations between Lagrange sound speed and in-situ particle velocity by different methods
图 8 阶梯靶实验中金属铜的自由面速度历史
Figure 8. The free surface velocity curves of Cu in step target experiment
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