基于钨粉示踪的射流塑性参数研究

Research on Plastic Parameters of Shaped Charge Jet Using Tungsten Tracer

采用钨粉示踪方法对聚能射流拉伸过程中的塑性参数进行研究。基于X光摄影系统测得了示踪点的轨迹特征,直观显示出药型罩各部位的拉伸变化,从而获得了射流拉伸运动时的轴向拉伸率、拉伸变化率、射流极限长度等动态塑性参数。在射流伸长过程中,药型罩各部位的形变总体变化规律为:药型罩中部最大,药型罩头部最小;各部分拉伸率差距逐渐减小。通过整体拉伸率的研究,预测出射流极限长337.13 mm,处于经验公式的预测区间。研究表明:采用射流标识特征可用于描述射流运动过程中的拉伸变化,进而良好预测其整体拉伸率及射流极限长度,获得相关塑性参数变化趋势。

A tracer method with tungsten powder for shaped charge jet is described in detail. The method is used to test the plastic parameters in experiment. The trajectory characteristic of tracer point is tested based on X-ray photography system. Stretching variation of each part of shaped charge liner from base to apex is displayed obviously. The dynamic plastic parameters,such as axial stretching rate,change of stretching rate and ultimate length of jet,are obtained. In the process of jet stretching,the overall changing rule of each part along the conical liner generatrix is that the stretching rate of middle part is the largest and that of top part is the smallest,and the stretching gaps of these parts decrease gradually. The ultimate length of jet is 337. 13 mm by the calculation of stretching rate,which is in the predictive range of empirical formula. The result shows that the identifying method can be used to describe the stretching variation in the process of jet movement,and then some dynamic plastic parameters,such as the overall stretching rate and the ultimate length of jet,would be predicted well.