一种小型炸药驱动飞片装置的试验与数值模拟研究

设计了一种速度可调的小型炸药驱动飞片装置,进行了不同密度的PETN炸药驱动飞片实验,利用VISAR激光速度干涉仪测量了飞片速度历程;采用VLW状态方程计算了PETN炸药不同密度的JWL状态方程,得到了JWL状态方程参数,进而通过显式动力学有限元程序Ansys/Ls-dyna模拟计算出飞片速度,其结果与试验结果基本吻合,验证了通过数值模拟计算飞片起爆速度的可行性;得到了飞片起爆速度与炸药密度的关系,飞片起爆速度可在2660～3150m.s-1之间调节,对应压力范围为54～86GPa。

Experimental and Numerical Studies on Flyer Initiation Device

A novel explosive driven flyer initiation device with changeable velocity was designed. Flyer initiation tests with different densities PETN were finished and the history of velocity of flyer was observed by VISAR. Parameters of JWL EOS of PETN with different densities were calculated by VLW EOS. Velocities of flyer was simulated by the finite element hydrocode Ansys/Ls-dyna, which were coincided with results of tests. It testified feasibility of numerical method to calculate velocity of flyer. The relationships between flyer velocity and density of PETN were gained,so that the velocity of flyer could be adjusted from 2660 m?s^-1 to 3150 m?s^-1 with corresponding pressure range of 54-86 GPa.