An Improved Impactor Design for Eliminating Spallation in High-Impedance Flyers During Hypervelocity Launch

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• 作者：J. S. Bai ; X. Wang ; X. Y. Pei ; Y. Wang ; Y. Y. Yu ; Q. Shen…
• 关键词：Hypervelocity launch ; Spallation ; numerical simulation ; Functionally graded impactor
• 刊名：Experimental Mechanics
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：56
• 期：9
• 页码：1661-1664
• 全文大小：550 KB
• 刊物类别：Engineering
• 刊物主题：Mechanical Engineering
  Theoretical and Applied Mechanics
  Characterization and Evaluation Materials
  Structural Mechanics
  Engineering Fluid Dynamics
  Engineering Design
  
• 出版者：Springer Boston
• ISSN：1741-2765
• 卷排序：56

文摘

Spallation in a high-impedance tantalum flyer was confirmed by using a specially designed hypervelocity launch (HVL) experiment, thereby indicating that the conventional flyer was unsuitable for equation of state (EOS) research on materials under ultra-high pressure. Based on the analysis and interpretation of the experimental data and the spallation’s reproduction via a high-fidelity detonation and shock (HDS) wave code, two possible methods to eliminate the spallation were proposed: (1) changing the impactor structure, which could greatly reduce spallation, and (2) altering the impactor material, which could completely eliminate the remaining spallation. We conducted a set of HVL experiments with an improved impactor design in which a high-impedance tantalum flyer was accelerated up to 10 km/s, and no spallation was found, demonstrating the effectiveness of the improved method for performing EOS research on materials under pressures of terapascals loaded by a three-stage light gas gun.