【摘要】 对带有哑铃状圆柱形试件的杆杆型冲击拉伸试验装置，建立了含有多个物理和几何间断面的二维轴对称弹塑性有限元模型，采用动态增量非线性有限元程序ＡＤＩ－ＮＡ，进行了数值模拟分析，揭示了应力波在试验系统中的传播规律，在弹塑性框架内初步论证了杆杆型冲击拉伸试验装置测试原理的有效性，既证实了一维测试原理近似成立的条件，又说明了这些条件是一定能找到的，即试件的几何参数与冲击拉伸试验系统之间一定存在使这些条件得以满足的匹配关系。更多还原

【Abstract】 At present, a bar bar tensile impact apparatus (SHTB) is widely used to measure the dynamic tensile properties of solid materials. SHTB consists of two long elastic bars, between which a specimen is glue connected. Hence, there are several physical and geometric discontinuous sections in SHTB. In the present paper, the results of the first comprehensive two dimensional (2D) numerical analysis of SHTB are obtained. A 2D axisymmetric elastoplastic finite element model for SHTB is established. The numerical solution for the model is solved by the dynamic incremental non linear finite element program (ADINA). The numerical results show the rule of the stress wave propagation is SHTB and quantitatively describe the effects of variations in both the specimen geometry and the different strain rate on the validity of the assumptions used in analyzing experimental data. In the scope of elastoplastic theory, the numerical analysis for SHTB shows that the validity of ID experimental measuring principle can also definitely be found out. Furthermore, the matching relation between the specimen and the SHTB system is discussed.更多还原