Research On The Technology Of Common Triggering Fuze For Foreign Trade Mortar

In order to provide a reference for designation of the mortar projectile fuze, the detonator safety of fuze, regularity of penetration into soil and water were simulated by the nonlinear element analysis software ANYSY/LS-DYNA, and then the safety distance when different charge destiny detonator explosive and its influence to the structure of fuze and the trajectory when mortar projectile penetrating into soil and the regularity of axial acceleration of fuze when in soil and water were obtained.Four kinds destiny detonator explosive at explosion interruption position were simulated by LS-DYNA, and then the regularity of different destiny detonation’s influence when explosive to the strength of fuze was obtained. The result indicates when the detonator explosive at explosion interruption position, its products would strongly impact the medium around it. The performance is that the aperture of detonator in rotor increased significantly and the cover above it also had large deformation. But the body of fuze has no significant structural damage and no fragments generated and fly. As a result, part of detonator explosion energy was consumed in the expansion work to the medium around it. And the safety distance of different destiny detonator was also obtained after the study.Penetration into soil of mortar projectile at different impact angle and velocity were simulated by ANSYS/LS-DYNA software, and then the trajectory in soil and acceleration in axial of projectile were analyzed, so that regularity of penetration into soil were obtained. The result indicates that the projectile would ricochet or not at different angle and velocity. At the same velocity, the projectile ricochets easier when the impact angle is small and the penetration depth becomes larger as the impact angle larger. At the same angle, the penetration distance becomes larger as the velocity increase. The tendency of axial acceleration of fuze is the same at different angle. The numerical value of the fuze becomes larger at first and then small with increased time and its peak value is 1000 g-14000 g. And the time reach the peak value is about 1～4 ms.The mortar projectile shooting at the surface of water at different impact angle and velocity were simulated by ANSYS/LS-DYNA software, then the regularity of early into the water of mortar projectile were obtained. The head of fuze got great pressure when hitting the surface of water. The peak pressure would be different as the velocity changes. When impact velocity is 150～300 m/s, the maximum peak pressure can reach to 0.43 GPa. When projectile penetrating into water at different situation, at the same angle, the axial acceleration becomes large as the velocity increases; and at the same velocity, the axial acceleration becomes large as the angle increases. The result also indicate that the acceleration is proportional to two times velocity and is a sine function relationship with impact angle.