Equations of state of some standard materials and the ahsolute tigh-pressure scale

一些标准材料的状态方程和绝对高压标尺

基本信息

批准号：
15204041
负责人：
KONDO Ken-ichi
金额：
$ 28.37万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15204041/
关键词：
High-pressure scale Equation of state Shock compression Terapascales Two-stage light-gas gun Three-stage light-gas gun 高速飛翔体

项目摘要

The objectives are to obtain experimental parameters for equations of state of some standard materials at pressures of multi-terapascal and to establish the absolute high-pressure scale. We need a high-velocity acceleration facility for symmetric impact of flat-plate-shaped materials in order to generate multi-terapascal pressures. The facility is a three-stage light-gas gun which was constructed by us seven years ago and was much improved after the construction. In this study, some operational timing jitters for synchronizing quick motion of heavy mechanical parts were reduced and confirmed. Since, however, the cooling of hydrogen gas and the erosion of a gun barrel were serious, remarkable increase of acceleration was not achieved. The projectile velocity of 10 km/s for a pressure of 1 TPa was not achieved.On the other hand, some new techniques were developed for such compact gas gun to be employed for accurate and precise equation of state experiments ; one is a convenient and preci … More se timing system, and the other is a fiber-transport-type line-laser reflection system for measuring shock velocity in materials. The former is based on the pre-event pulse generator which was developed originally by the head investigator ; the system can generate a timing trigger pulse which has a few nanoseconds time-resolution by the flyer and does not need a trigger pins arrangement on the target. Therefore, the system makes it possible that the target size is as large as the flyer. The latter also makes it possible to observe flyer distortion and tilt and target deformation due to escaped acceleration-gas.The absolute error of high pressure Hugoniot parameters was +/- 0.5% upto impact velocity of 6.5 km/s in the case of copper symmetric impact, but +/-2 or 3% between impact velocities of 6.5 and 8 km/s due to the both of deformation of target and flyer. We need to improve some technical issues such as optimization of gun operation and reinforcing of target assembly in order to obtain high-pressure standard data for multi-terapascals. Less

这些目的是在多质体压力下获得某些标准材料状态方程的实验参数，并建立绝对的高压量表。我们需要一个高速加速器设施，以对平板形材料的对称影响，以产生多质量压力。该设施是一种三阶段的轻型枪，是七年前由我们建造的，在建设后得到了很大改善。在这项研究中，减少并确认了一些用于同步重机械零件快速运动的操作计时抖动。然而，由于氢气的冷却和枪管的侵蚀是严重的，因此没有实现显着的加速增加。未达到1 TPA压力的10 km/s的弹丸速度。另一方面，开发了一些新技术，以聘请这种紧凑的气枪，以进行准确，精确的状态实验方程。一个是一种方便而精确的……更多的SE定时系统，另一个是用于测量材料中冲击速度的光纤型线型线激光反射系统。前者是基于事件前脉冲发生器，该脉冲发生器最初是由主管调查员开发的。该系统可以生成一个正时触发脉冲，该脉冲具有传单的几纳秒时间分辨率，并且不需要触发销钉在目标上。因此，系统使目标大小与传单一样大。后者还可以观察到由于逃逸加速气而引起的传单失真，倾斜和目标变形。高压雨果参数的绝对误差为+/- 0.5％，在6.5 km 2或6.5 km/s/8 km/8 km/s的目标之间，铜对称速度的影响为6.5 km/s，均为6.5 km/s。我们需要改善一些技术问题，例如优化枪支操作和对目标组装的加强，以便获得多毛囊的高压标准数据。较少的