基于SPH方法的射孔枪设计及射孔过程研究

摘要

基于SPH方法对射孔枪射孔过程进行了模拟,并实现高速射流情况下的射孔过程仿真.计算了射孔弹弹型不变的情况下以40CrNiMo为材料的枪筒,在不同射流速度下盲孔毛刺高度值,不同射流速度和不同盲孔深度下的穿孔直径以及不同材料下毛刺高度值.通过计算发现,盲孔毛刺高度随射孔速度的增加而降低,且高度值变化幅度越来越小；射孔枪的穿孔直径随射孔速度增大先增大而后减小.给出相应的射孔枪穿孔直径与射孔速度关系的拟合公式,射孔枪的穿孔直径随盲孔深度的减小而增大.对于同样尺寸的枪筒,40CrNiMo材料比45号钢有更高的冲击韧性,产生更小的毛刺和穿孔直径.%SPH method is used to simulate the perforating processes, and the perforation in high velocities is simulated. The maximum flash heights of the blind holes are calculated in different efflux velocities, the perforation diameter of the blind holes are calculated in different efflux velocities and different blind holes depths and the flash heights in different materials. It is demonstrated that the heights of the flashes are decreased and the perforation diameters of the perforating gun are firstly increased and then decreased with the increase of the efflux velocity. A fitting formula is given to describe the relationship between perforation diameter and efflux velocity. The perforation diameters of the perforating gun increase with the decrease of the blind holes depth. The toughness of 40CrNiMo is higher than 45 steel, which leads to the fact that the flash heights and the perforation diameters in case of 40CrNiMo are lower.