改善Hopkinson压杆的波形分离技术

A wave separation technique based on modification of the split Hopkinson pressure bar

在阐述一维应力波的理论知识和Hopkinson压杆(split Hopkinson pressure bar,SHPB)系统的工作原理基础之上,采用波形整形器改善加载波形振荡,且在入射杆2个不同位置粘贴应变片来测量应变波形,利用大距离应变片粘贴方法的分离波形技术改善SHPB系统杆长的限制.结果表明,该方法能有效地分离叠加波形,得到完整的入射波和反射波,并且简化了试验的处理过程.同时,采用入射波、反射波和透射波三者之间的关系以及测试的原始波形和分离波形之间的比较来验证,说明了该波形分离技术的合理性及可行性.

On the basis of one-dimensional stress wave theory and the principles of the split Hopkinson pressure bar （SHPB） technique, the vibration of a loading wave was improved by a wave shaper, and the strain wave was measured by dual strain-gages in the incident bar. The limitations of an SHPB apparatus were improved by the wave separation technique, using the large distances possible with dual strain-gage measurement. The results showed that this method can be used to separate overlapping waves in order to assess the whole of the incident and reflected waves, allowing the process of experimentation to be simplified. At the same time, the reasonability and feasibility of the method were tested by examining the relationships between the incident, reflected, and transmitted waves, and comparing between the original waves and separated waves.