A Medium-caliber Naval Gun Piercing Blasting Bomb Fuze System Analysis, Design And Related Technology Research

The fuze which assembled in armor-piercing high-explosive(APHE) projectile can initiate the projectile in the target after penetrating target. the detonation wave and fragments of projectile or secondary effect after initiation or ignition is used to damage and dynamite the effectives and equipments in the target.In order to meet the dedign demand of the fuze of APHE projectile, the fuze was designed through analyzing input demand and whole program. The result shows that the fuze not only meet the special requirements of APHE projectile fuze, but also has function of self-destruction and sterilization.In order to study strength of the bottom part of the base fuze, five kinds of improvement schemes of the bottom part of the base fuze and finite element model was established using the software ANSYS/LS-DYNA, thermal-structural coupling of the bottom part of the base fuze was analyzed during launching process, the simulation results were feasible and effective by comparing the simulation results with the firing range to test recovery of the deformation of the sample, at the same time, different thickness and shape to temperature distribution, deformation and stress had impact on characteristic of the bottom part of the base fuze. The simulation results shows that compared with the structure analysis, the deformation and stress of the base fuze's bottom has increased through the thermal-structure coupling analysis, and indicates that the temperature has a greater impact on the structure and strength of the base fuze's bottom; the thermal-structure coupling analysis shows that both replacing aluminum alloy to steel and increasing bottom's thickness can improve the strength and stiffness of base fuze's bottom and reduce the deformation, when the weight limit is allowed, the effect on replacing materials is more obvious than increasing bottom's thickness; when increasing same thickness, increasing bottom's thickness in whole is better than that partly for improving the deformation of the bottom, and while improving the deformation of the bottom, it is prior to be considered that adding the a boss to the center of bottom or increasing bottom's thickness.In order to study the characteristics of drop shock response when the projectile drops in accident, the projectile dropping to different targets and different assembly states of base fuze and projectile are simulated with ANSYS/LS-DYNA. The results show that when the projectile(including fuze)drops to steel, concrete, fir and sand, the peak of drop shock overload is about 12000 g,6000 g and 650 g relatively, the time of effect is about 50μs,150μs and 1000μs relatively; the depth of recessing shell body is 0.05 mm,0.10 mm,0.15 mm and 0.20 mm, drop shock response effect of fuze is almost same completely. The hight of protruding shell body's bottom is 0.05 mm,0.10 mm and 0.15 mm, drop shock overload of fuze is gradually decreasing with the value of protruding increasing; when exceeding 0.15 mm, drop shock overload does not change with the value of protruding increasing; when the value of recessing and protruding is 0.2 mm, with the material of fuze body being changed into 45# steel and H62, the peak of drop shock overload would increase correspondingly.