DNAN基熔铸装药榴弹跌落冲击特性与安全性分析

为研究DNAN（2,4-二硝基苯甲醚）基熔铸炸药跌落过程的力学响应，设计了含模拟装药的榴弹跌落试验，应用力传感器测试系统分析了弹体跌落的冲击响应特性。同时，基于有限元方法模拟了DNAN基熔铸装药弹体在不同工况下的跌落过程，得到了DNAN基熔铸炸药受到的应力载荷及冲击加速度过载变化规律。结果表明:通过试验与仿真对比，验证了有限元模拟弹药跌落的可行性；DNAN基熔铸炸药受到的冲击载荷在传递过程中呈现出递减的趋势，作用时间在1~2 ms之间；弹体装药冲击载荷峰值随跌落高度与角度的增加而变大，作用时间近似相同；DNAN基熔铸炸药升温随着跌落高度的增加而增大，整体升温幅度为2.3~5.8 ℃。仿真结果可为DNAN基熔铸装药榴弹跌落安全性设计提供依据。

Drop Impact Characteristics and Safety Analysis of DNAN-Based Melt-Cast Charge Grenade

In order to study the mechanical response of DNAN-based melt-cast explosive during the drop process, a drop test for the grenade containing a simulated charge was designed, and impact response characteristics of the projectile after falling were analyzed by the force sensor test system. At the same time, based on the finite element method, the falling process of DNAN-based melt-cast charge projectile under different working conditions was simulated, and stress load and change law of impact acceleration overload of the DNAN-based melt-cast explosive was obtained. Results show that the feasibility of finite element simulation of ammunition drop is verified by the comparison of experiment and simulation. Impact load of DNAN based melt cast explosive shows a decreasing trend in the transmission process, and the action time is 1 2 ms. Peak impact load of the body charge increases with the drop height and angle, and the action time is approximately the same. Temperature rise of the DNAN-based melt-cast explosive increases with the drop height, and the overall temperature rise is 2.3 5.8 ℃.The simulation results can provide a basis for the drop safety design of DNAN-based melt-cast charge grenade.