Test Method on Dynamic Mechanical Behavior of Initiating Explosive Device under High Acceleration
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摘要:采用Hopkinson压杆技术和装置测试了火工品高过载动态力学性能，通过改变波形调制器的材料、厚度和改变子弹长度可以控制速度脉冲的宽度，提高加速度脉冲的宽度。研究表明：引起破坏的加速度临界值不仅与加速度幅值有关系，而且与加速度脉冲宽度有很大的关系。采用间隔取点、速度平滑、加速度平滑及曲线拟合等方法可以使加速度的取值更加精确和可靠。运用LS-DYNA有限元进行模拟仿真，计算得到的加速度曲线与仿真结果相吻合。
Abstract:Based on the technique of Split Hopkinson Pressure Bar (SHPB), the test method on dynamic mechanical behavior of initiating explosive device under high acceleration is proposed in this paper. The test results show that the acceleration pulse shape, width and amplitude are controlled by a pulse shaper and strike bar length. The critical acceleration causing the failure of the initiating explosive device is depended on the acceleration pulse width and amplitude. Some method to calculate the acceleration of the initiating explosive device is discussed and chosen. The numerical simulation is also conducted by using the LS-DYNA finite element program. Good agreements are achieved between the test and the simulation results.
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