XU Peng
(Key Laboratory of Instrumentation Science & Dynamic Measurement (North University of China），Ministry of Education, Taiyuan 030051, China)
Abstract： The freestyle Hopkinson bar is a kind of main high g loading equipment utilized widely in calibration of high g accelerometer and other high shock conditions. The calibration experiment of accelerometer was conducted. With one-dimension stress wave theory, ANSYS/LS-DYNA software and experiment, the effect rules of the projectile’s front-head style and the accelerometer’s mounted base’s length on acceleration waveform were analyzed. The results show that the acceleration duration inspired from Hopkinson bar is almost equal to the rising edge time of perfect half sine stress wave, and it is independent to the mounted base’s length. Moreover, the projectile’s front-head style is a main affecting factor, and the projectiles with less conical degrees will produce the lower amplitude and longer acceleration duration.
Key words： Hopkinson bar; high g acceleration; stress wave; waveform adjustment
CLD number： TJ410Document code： A
Article ID： 1674-8042（2015）01-0001-06doi： 10.3969/j.issn.1674-8042.2015.01.001
References
［1］ Foster J T, Frew D J, Forrestal M J. Shock testing accelerometers with a Hopkinson pressure bar. International Journal of Impact Engineering, 2012, 46: 56-61.
［2］ FENG Lei, MA Tie-hua. Transverse effect on sensitivity of high impact accelerometer and measurement error caused by mounting of accelerometer. Journal of Vibration and Shock, 2014, 20(20): 198-201.
［3］ FAN Jin-biao， ZU Jing， LIN Zu-sen. Shock calibration for a high-g accelerometer using a laser interferometer. Journal of Vibration and Shock, 2012, 31(11): 149-153.
［4］ Forrestal M J, Togami T C, Baker W E, et al. Performance evaluation of accelerometers used for penetration experiments. Experimental Mechanics, 2003, 43(1): 90-96.
［5］ ZHOU Guang-yu, HU Shi-shen. Pulse-shaping techniques of high-g-value acceleration generators. Explosion and Shock Waves, 2013, 33(5): 479-485.
［6］ Kurtaran H, Buyuk M, Eskandarian A. Ballistic impact simulation of GT model vehicle door using finite element method. Theory and Applied Fracture Mechanics, 2003, 40(2): 113-121.
［7］ WANG Lei, LI Yu-long, SUO Tao. Mechanical behavior of commonly used aeronautical aluminum alloys under dynamic tension. Journal of Aeronatrical Material, 2013, 33(4): 71-76. 弹头形状对Hopkinson杆校准系统
高g值加速度波形的影响徐鹏
（中北大学 仪器科学与动态测试教育部重点实验室， 山西 太原 030051）
摘要:自由式Hopkinson杆是一种主要的高g值加载设备， 已经被广泛应用于高g值加速度计校准和其它高冲击环境中。 介绍了自由式Hopkinson杆校准的加速度计试验， 应用一维应力波理论和ANSYS/LS-DYNA软件以及试验手段， 分析了子弹头部形状， 加速度计安装座长度等因素对加速度波形的影响。 结果表明： 自由式Hopkinson杆产生的加速度持续时间等于理想半正弦应力波前沿， 并与安装座长度无关； 子弹头部形状对加速度波形影响较大， 头部锥度小的子弹产生的加速度幅值较低、 持续时间较宽。
关键词:Hopkinson杆； 高g值加速度； 应力波； 波形调节
引用格式：XU Peng. Effect of projectile head style on high g acceleration waveform of Hopkinson bar calibration system. Journal of Measurement Science and Instrumentation, 2015, 6(1)： 1-6. ［doi： 10.3969／j.issn.1674-8042.2015.01.001］
[full text view]
