Ballistic impact and sealed chamber tests were performed on the steel-encased reactive material projectile (SERMP) to understand its behind-plate overpressure effect when impacting the thin aluminum plates. The reactive material encased with a 1.5 mm thick 30CrMnSiNi2A steel shell was launched onto the initially sealed test chamber with a 3 mm thick 2024-T3 thin aluminum cover plate. Moreover, the overpressure signals in the test chamber were recorded by pressure sensors. The experimental results indicate an unusual behind-plate overpressure effect: as the density of the projectile increases from 6.43 g/cm³ to 7.58 g/cm³ by increasing the content of tungsten powder, although its total chemical energy decreases, it produces a higher behind-target overpressure at a lower impact velocity. A theoretical model is proposed to predict the reaction length of reactive material inside the projectile based on one-dimensional shock wave theory to understand this unexpected result. In addition, the deviation between the actual energy release and the theoretical calculation results, also the variation of overpressure rise time are analyzed and discussed. As the analyses show, when the SERMP successfully penetrates the cover plate, an increasing density of the reactive material inside the projectile always means that the delaying rarefaction wave effect, an increase of its internal pressure and strain rate levels. These factors lead to the increase of the overpressure limit velocity and reaction extent of the reactive material, while the overpressure rise time decreases.

对钢包反应材料弹丸 (SERMP) 进行了弹道冲击和密封室测试，以了解其在撞击薄铝板时的板后超压效应。用 1.5 毫米厚的 30CrMnSiNi2A 钢壳包裹的反应材料被发射到带有 3 毫米厚的 2024-T3 薄铝盖板的初始密封试验室中。此外，测试室中的超压信号由压力传感器记录。实验结果表明了一种不寻常的板后超压效应：随着弹丸的密度从 6.43 g/cm ³增加到 7.58 g/cm ³通过增加钨粉的含量，虽然它的总化学能降低，但它会在较低的冲击速度下产生较高的靶后超压。提出了一种基于一维冲击波理论预测弹丸内反应材料反应长度的理论模型，以了解这一意想不到的结果。此外，分析讨论了实际能量释放与理论计算结果的偏差，以及超压上升时间的变化。分析表明，当 SERMP 成功穿透盖板时，弹丸内反应材料的密度增加总是意味着延迟稀疏波效应，增加其内部压力和应变率水平。