为了研究具有较低强度和较低波阻抗的软材料的高应变率动态拉伸力学性能,提出了一种采用空心铝管作为入射杆和透射杆的直接拉伸式SHTB实验装置.详细讨论了该实验装置几个关键问题,并提出了相应的解决方案.利用研发的实验装置对圆柱形丁氰橡胶试件进行试验,成功获得了丁氰橡胶在直接拉伸荷载作用下的应力波形曲线,并由此进一步得到了该材料在应变率为240 s-时的应力应变曲线.实验结果表明,提出的新型SHTB装置可更方便的用来测定软材料的高应变率动态拉伸力学性能,且操作简单,成功率高.%To investigate the dynamic tensile properties of soft material with low strength and low wave impedance,an improved SHTB facility was proposed.The specially designed hollow aluminum tubes were used as the incident bar and transmission bar in the proposed facility.Some key affecting issues in the facility were discussed,and the corresponding solutions were presented.A number of cylinder specimens made of butyl cyanide rubber were tested with this improved SHTB facility.The stress wave curve of the butyl cyanide rubber under direct tension was successfully obtained,and the typical stress-strain curve of this material at a high strain rate of 240 s-1 was calculated.It is proved that the proposed SHTB facility is precise enough to measure the dynamic tensile mechanical properties of the soft material,and it has the advantages of convenient operation and good reproducibility.
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