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脉冲整形常被用来修正霍普金森压杆的入射波形,以保证加载过程中试件的应力均匀性和恒应变率.本文提出了一种具有较好的波形整形效果和较宽适用范围的分离式霍普金森压杆(SHPB)入射波整形方法.采用真空封泥这种可忽略强度的材料作为入射波的波形整形器,结合撞击速度调整封泥的用量,可以得到正弦函数及缓升平台的类梯形波等不同的整形效果.数值模拟分析表明,真空封泥的波形整形效应主要由材料变形过程中的径向惯性效应控制.应用实例显示,经波形整形的SHPB实验试件两端的应力平衡得到较大的改善.
Pulse shaping is often used to correct the incident waveform of Hopkinson pressure bar, in order to ensure the stress uniformity and constant strain rate of the specimen during loading.This paper presents a better waveform shaping effect and wider applicability Split Hopkinson pressure bar (SHPB) method of incident wave shaping.Using the material of negligible strength of vacuum sealing mud as the incident waveform wave shaper, combined with the impact velocity to adjust the amount of sealing mud, can get the sine function and slow Such as trapezoidal wave and platform-like trapezoidal waves.The numerical simulation shows that the waveform shaping effect of vacuum sealing mud is mainly controlled by the radial inertia effect in the deformation process of the material.The application examples show that the waveform-shaped SHPB experimental specimen at both ends Stress balance has been greatly improved.