• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >PVDF shock sensors: applications to polar materials and high explosives
【24h】

PVDF shock sensors: applications to polar materials and high explosives

机译：PVDF震动传感器：应用于极性材料和高爆炸物

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ferroelectric polymers (PVDF) with well-defined and precisely known electrical properties are now routinely available from commercial sources. Electrical processing with the Bauer cyclic poling method can produce individual films with well-defined remanent polarization up to 9 ΜC/cm2. These polymers provide an unusual opportunity to study the structure and physical properties of materials subjected to shock loading. The behavior of PVDF has been studied over a wide range of pressures using high-pressure shock loading and has yielded well-behaved, reproducible data up to 25 GPa in inert materials. The application of PVDF gauges for recording shock waves induced in polar materials such as Kel-F, PMMA, or in reactive materials is hampered by observations of anomalous responses due to shock-induced polarization or an electrical charge released inside a shock-compressed explosive. A solution using an appropriate electrical shielding has been identified and applied to PVDF for shock measurement studies of Kel-F, and for Hugoniot measurements of high explosives (PH). Furthermore, shock pressure profiles obtained with in situ PVDF gauges in porous HE (Formex) in a detonation regime have been achieved. Typical results of shock pressure profile versus time show a fast superpressure of a few nanoseconds followed by a pressure release down to a plateau level and then by a pressure decay. More accurate measurements are reported with electrically improved PVDF gauges as well as with 0.25 mm2 active area PVDF gauges.
机译：现在，可以从商业来源常规地获得具有明确和精确已知的电性能的铁电聚合物（PVDF）。用鲍尔循环极化法进行的电处理可产生具有高达9 mcC / cm2的明确剩余极化的单个薄膜。这些聚合物为研究承受冲击载荷的材料的结构和物理性质提供了难得的机会。已使用高压冲击载荷在很宽的压力范围内研究了PVDF的行为，并在惰性材料中获得了高达25 GPa的良好性能，可再现数据。由于观察到由于震动引起的极化或震动压缩炸药内部释放的电荷而引起的异常响应，因此妨碍了PVDF测量仪在记录在极性材料（例如Kel-F，PMMA或反应性材料）中感应的震动波的应用。已经确定了使用适当电屏蔽的解决方案，并将其应用于PVDF，用于Kel-F的冲击测量研究以及高爆炸物（PH）的Hugoniot测量。此外，已经获得了在爆炸状态下使用多孔HE（Formex）中的原位PVDF压力计获得的冲击压力曲线。冲击压力曲线随时间变化的典型结果显示，快速超压为几纳秒，随后压力释放至平稳水平，然后压力衰减。据报告，采用电气改进的PVDF压力计以及0.25 mm2的有效面积PVDF压力计可实现更精确的测量。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号