金属材料SHPB实验数据处理的三波校核法

A three-wave coupling method for data treatment in SHPB experiments with metal samples

通过自编程序调整入射波、透射波和反射波的相对位置。当移动波相对位置时,程序界面显示2幅图:一幅显示入射波、透射波、反射波以及透射波与反射波之差;另一幅显示试样的3条应力应变。这3条曲线分别由第1幅图中的入射波与透射波、入射波与反射波以及三波法求得。根据SHPB实验的基本假定,这3条应力应变曲线的塑性段应该一致,同时透射波与入射波之差应等于反射波,把这2个等价的特点作为正确处理SHPB实验数据标准的方法称为三波校核法。

The relative positions of incident wave, transmission wave and reflection wave can be changed by the self-developed program. When the relative position of the waves is adjusted, the self- developed program gives two images. One image displays incident, transmission, reflection waves and the difference between transmission and incident waves. The other image lays out the three strain- stress curves of the specimen. The three curves are plotted separately through incident and transmission waves, incident and reflection waves, and the three waves from the first image. According to the basic assumptions of the SHPB experiment, the three curves should be consistent in the plastic region, and the difference of transmission and incident waves should be equal to the reflective wave. The two equivalent characteristics can be used as criteria of treating the experimental data correctly or not. This experimental data treatment method is called the three-wave checking method.