Detonating A Grenade Fuze Key Technology Of Mechanical Trigger

In order to provide reference for optimizing design of a rifle grenade mechanical contact fuze, LS-DYNA was used to simulate the process of rifle grenade penetrating target plate. The warhead of rifle grenade is truncated cone, and the diameter at the end of warheads is different. The target plate’thickness and material are different. And the angle of bullet penetrating target plate is different yet. The grenade’s set-forward overload factor and speed attenuation variation on different penetration conditions have been analysed.For analyzing the response of fuze setback arming device, ADAMS was used to simulate the process of single degree of freedom arming device respongding to different setback overloads, and LS-DYNA was used to simulate the process of rigid sheared arming device respongding to different setback overloads. The simulation results demonstrate that the arming time of two kinds of arming devices is shorter with shorter time of setback overload, when arming devices can arming in same overload factor, and the rigid setback arming device counldn’t arming under overload of3000g and10000g when the overload time changing from0.15ms to9.6ms, but elastic setback arming device could arming on same conditions. So it is more suitable for the launch environment of short setback overload loading time to take rigid sheared arming device. Therefore different launch environments need different kinds of setback arming device of fuze.In order to optimize the rigid setback arming device of fuze, LS-DYNA was used to simulate the setback arming device performance with different materials, dimensions, setback overloads and the gap between structures. The simulation results demonstrate that the arming reliability and validity of the arming device is better, when the gap between structures is smaller, the brittleness of shear pin material is better, the material of noumenon and inertia cone is more hard, the value of setback overload factpr is bigger, the time of setback overload with same setback overload factor is shorter. Also the chamfer and fillet like C0.3or R0.3have a small influence on the arming performance of the device. So the factors such as material, overload, and dimension and so on should be considered synthetically when designing rigid shear setback arming device of fuze.The fuze’s output explosive power depends on explosive power of detonators in fuze explosive train. In order to analyze the reaction of explosive power of detonators to structure shape, dimension, density of explosive, and compare the difference among steel dent test, aluminum dent test, and lead disc test. LS-DYNA was used to simulate the process of explosion. The simulation results demonstrate that output explosive power of detonator is bigger with much more booster explosive, and structure of shaped charge depression of booster can enhance the output explosive power of detonator, and steel concave depth in steel dent test of the axial output explosive power of detonator I gradually decreased from3.32mm to0.05mm when booster distance changed from0to3.2mm. So the axial detonator explosive power outputting to the warhead decreased gradually with increasing booster distance. Different booster shell thickness, material, strengthens cap charge density and so on have different influnce on the output explosive power of detonator. The same detonator has different results of output explosive power by three different test methods, then the applicable scopes of the three methods are different yet. Therefore various factors should be considered when optimizly designing the fuze output explosive structure or detonator, and yet it should use appropriate test method to assess the output axial explosive power.