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多年以来人们就知道：一些聚能装药结构产生一种径向膨胀的射流，此特征称之为射流的发散性。发散性大大地降低射流的穿透能力。实验证明，发散性与材料的音速有关。本文指出：径向膨胀是由于从压垮区来的喷射物排出时射流的状况引起的。在与压垮区相毗连的一个小范围，射流的轴向速度将产生突增。如果在此范围内，一些点的流动是超音速的（与压垮点的参照系有关），射流的径向膨胀将发生；如果在此区域内流动是亚音速的，径向膨胀将不发生。必须指出：对弹塑性物体而言，相关音速是低压下纵向音速。发散性并非人们以往研究假定的那样，是由于碰撞生成的激波所形成。
It has been known for many years that some shaped charge structures generate a radially expanding jet, a feature called jet divergence. Divergence greatly reduces jet penetration. Experiments show that the divergence and the sound velocity of the material. It is pointed out in this paper that the radial expansion is due to the condition of the jet at the time of jet discharge from the crush zone. In a small area adjacent to the collapse zone, the axial velocity of the jet will have a sudden increase. If within this range, the flow at some point is supersonic (related to the frame of reference for the crush point), the radial expansion of the jet will occur; if the flow is subsonic in this area, the radial expansion will not occur . It must be pointed out that for elastic-plastic objects, the relative speed of sound is the longitudinal velocity of sound at low pressure. Divergence is not what people have assumed in previous studies because of shock waves generated by the collision.