Hopkinson拉杆的入射波波形整形实验研究

Experimental Investigation on Incident Waveform Shaping on a Spilt Hopkinson Tensile Bar Equipment

目前,分离式Hopkinson杆实验技术已经被广泛用于测试材料在10~2~10~4s^(-1)应变率范围内的动态力学特性。为了抑制入射波的高频振荡,实现恒定应变率加载,本文利用分离式Hopkinson拉杆(SHTB)实验装置,研究了加载金属短杆(2A12T4铝合金)及整形垫片(纸板、PVC软塑料及带磁性胶皮)对入射波波形的影响。实验结果表明,整形垫片降低了入射应力脉冲的高频振荡,获得了比较平滑的入射应力脉冲,延长了上升时间。同时,利用所得的波形整形结果,对2A12T4铝合金进行了拉伸应力波脉冲加载的拉伸和断裂实验测试。

At present,spilt Hopkinson tensile bar（SHTB）technique has been widely employed to study the dynamic mechanical behavior of engineering materials subjected to loading within a range of strain rate 10~2~10~4s^（-1）.In order to restrain the high frequency oscillation of incident wave and to realize loading with constant strain rate,the influence of 2A12T4 aluminum alloy short rod and other three wave shapers made of paperboard,PVC soft plastic and magnetic rubber respectively was experimentally studied based on a spilt Hopkinson tensile bar equipment.Experimental results indicate that incident stress pulse high frequency oscillation is restrained by wave shapers,and smooth incident stress pulse is obtained,the rising time is extended.Moreover,using obtained waveform shaping results,tensile and fracture experiments for 2A12T4 aluminum alloy were performed on SHTB experimental apparatus.