SHPB系统波形弥散与压杆直径相关性的研究

Research on SHPB wave dispersion relate to bar diameter

通过数学推导和有限元数值模拟,研究了不同直径压杆SHPB系统的波形弥散情况,结果表明:76 mm铝杆的应力波形弥散性明显强于37 mm铝杆,两杆的弥散性差异与两杆半径的比值成平方关系;在同一个压杆中随着时间的推移应力波形的弥散性变强,应力波形的上升也在逐渐增加,这在直径较大的76 mm压杆中尤其明显。

Based on mathematical derivation and finite element numerical simulation, test the wave dispersion of SHPB bar relate different radii. The results show that wave dispersion in Ф76 mm aluminum bar is stronger than in Ф37 mm aluminum bar, the difference of the wave dispersion in two bars relate to the square of radius ratio. In the same bar wave dispersion becomes strong over time and wave rising edge increase gradual- ly, this is particularly evident in Ф76 mm pressure bar.