套管式冲击拉伸实验装置的研制

Development of the Casing Type Impact Tension Experimental Device

介绍了几种常见的冲击拉伸实验装置,并做了简要的评述。提出了一种改进后的套管式冲击拉伸实验装置,该装置直接产生拉伸脉冲,消除了反射式冲击拉伸实验装置中两种干扰信号的影响,得到了远比反射式冲击拉伸实验更为理想的透射波形。运用改进后的套管式冲击拉伸试验装置对几种板材材料进行了动态拉伸实验,得到了这几种板材在600/s,1200/s,1800/s应变率下的应力应变曲线,与静态应力应变曲线相比较,反映了这几种板材具有明显的应变率效应。根据实验结果中动态与静态应力应变曲线的一致性,分析了这种套管式冲击拉伸实验装置的优越性与有效性,它能更好地反映材料的动态力学性能。

An introduction and a brief comment on several common devices applied to impact tension test and an improved casing-type impact tension test device are presented in this paper. This device can bring directly tensile pulse and eliminate two kinds of interfering signal from reflection type Hopkinson tensile bar, and obtain transmission waveforms much better than that obtained from reflection type impact tensile experiments. Using this improved Casing-type impact tension test device, several dynamic tensile tests of plate material were carried out and stress-strain curves under three strain rates （600/s, 1200/s, 1800/s） were obtained. Comparing these high strain rate stressstrain curves with static stress-strain curves, the strain rate effects are obviously reflected. According to consistency of experimental results obtained from the dynamic and static stress-strain curves respectively, the advantage and validity of casing type impact tension test device were specifically analyzed. It can reflect the dynamic mechanical properties of material much better.