Research On The Power Improvement Of Small-caliber Grenade Warhead

As the ultimate damage unit to the target of ammunition damage,how to improve power of warhead is an important direction of weapons research.Fragmentation Warhead is an important part of warheads of conventional weapons,and enhancing its damage capability is the topic of our research.In this paper,we investigated the factors affecting the killing performance of the small-caliber grenade warhead,including the initial velocity,the uniformity,and the spatial distribution,one by one through simulation studies.The initial velocity of the fragment is increased by changing the shape of the charge and optimizing the aspect ratio of the charge;improving the uniformity of the fragment by optimizing the groove parameters;In order to increase the killing area of the fragment,it is proposed to increase the fragmentation angle of the fragment by using the combination of high and low explosive explosives on the basis of the principle of the waveform controller;A powerful enhancement scheme for changing the four ways of forming an omnidirectional fragment in the form of the bottom of the warhead and the structure of the top of the warhead.The numerical simulation method was used to simulate and analyze the designed power enhancement scheme,and the final design scheme of the warhead was determined,and the fracture test of the sample bomb was carried out.The main contents and conclusions are as follows:1)We study the variation of the peak value of shock wave overpressure in the air domain after spherical charge and the cylindrical charge with different ratios,and obtain the variation of overpressure peak with aespect to length-to-diameter ratio.The overpressure peak of the spherical charge is basically the same at the same proportional distance.As for the cylindrical charge,at the same proportional distance,the overpressure peaks are different in different directions.In the radial direction,the overpressure peak is proportional to length-to-diameter ratio,and the difference between the maximum and minimum are 11%.In the axial direction,the overpressure peak is inversely proportional to length-to-diameter ratio,and the difference between the maximum and minimum are 60%.2)Using the simplified model and using AUTODYN for simulation calculation,we obtained the fracture law of the inner and outer grooved shells.Under the same conditions,the outer V-groove shell fragments are more favorable for obtaining more energy.We used the orthogonal experiment method to study the influence of groove depth,groove spacing and groove angle on the formation of fragments.The factor that affects the formation of fragments is the groove depth.To obtain uniform fragment,the groove depth can be choosen as one third of the wall thickness,the groove angle can be choosen as 60,and the groove can be choosen as 1.25 times wall thickness.3)We used the numerical simulation method to analyze the effect of the sandwich charge on the spatial distribution of the fragments.After determining the type of interlayer charge,the appropriate charge ratio and the overall design of the small-aperture warhead was determined,we conducted a series of simulations.In the lateral direction of the warhead,the scattering angle of the interlayer charge is smaller than the scattering angle of the central detonation,and bigger than that of the end face detonation,which increases the killing area.In the head and bottom of the warhead,affected by the groove,a certain number of fragments were formed,and the fragments formed by the mezzanine charged warhead were more uniform,which increased the forward killing ability of the warhead.As for the mass of the fragmentation,the simulation results are similar to the experimental results when the fragmentation mass is greater than 0.15 g,while difference appears when the fragmentation mass is less than 0.15 g,but the overall distribution of the fragment mass is consistent with the real test.The simulation results are consistent with the experimental results of the sample bombs designed according to the research content.The research methods and conclusions of this paper provide reference value for the same type of projectile design.