论文部分内容阅读
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/LSDYNA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。
The free-standing Hopkinson bar is a major high-g loading device that has been widely used in high-g accelerometer calibration and other high-impact environments. The accelerometer test of free Hopkinson bar calibration is introduced. The one - dimensional stress wave theory, ANSYS / LSDYNA software and experimental methods are used to analyze the influence of bullet head shape and accelerometer mount length on the acceleration waveform. The results show that the duration of acceleration produced by the free-form Hopkinson bar is equal to the leading edge of the ideal half-sine stress wave and has no relation with the length of the mounting seat. The shape of the bullet head greatly affects the acceleration waveform. The amplitude of the acceleration caused by bullets with small head taper Low, wide duration.