报告研究了射流侵彻加强塑料时实验结果与流体动力学理论计算结果之间的明显差异的原因。这种差异还未曾进行过合理的解释。加强塑料的侵彻阻力服从流体动力学模型，然而，侵彻加强塑料时有效射流的长度明显变小，这是由于部分射流消耗在孔壁上引起的。导致射流对加强塑料侵彻能力下降的原因也正在于此。研究发现，在侵彻过程中孔壁径向塌陷，而塌陷是射流在孔壁上消耗的主要原因。孔壁的塌陷是由于目标材料的可压缩效应所致 The report examines the reasons for the significant differences between experimental and hydrodynamic theoretical calculations of jet penetration into reinforced plastics. This difference has not been a reasonable explanation. The plastic penetration resistance obeys the hydrodynamic model. However, the length of the effective jet penetrates significantly when the plastic is strengthened, due to the partial jet flow on the hole wall. This is where the jet causes a drop in the penetration of plastics. It is found that the wall of the hole collapses radially during the process of penetration and the collapse is the main reason that the jet is consumed on the wall of the hole. The collapse of the cell wall is due to the compressibility of the target material