As a new type of ammunition,cased telescoped ammunition(CTA)has the advantages of small size,regular shape and so on,and it is one of the important directions of ammunition development in the future.The fragmentation of the projectile body directly affects the power of the projectile.In order to improve the power of the projectile,the material of projectile body,the type of explosive and the charging structure of projectile body must be reasonably matched.The fragmentation test of three commonly-used projectile body materials(e.g,30CrMnSiA,40MnNiMo and 50SiMnVB)was carried out to find a kind of projectile body material which is suitable for a small-caliber CTA projectile.The test results show that,the number of effective fragments formed by the projectile body of 50SiMnVB material is the largest,and the quality is relatively uniform,so it is more suitable for the projectile body material of small-caliber ammunition.Aiming at the problems of uneven mass distribution and low utilization rate of fragments formed by 50SiMnVB projectile body material,the finite element analysis software ANSYS LS/DYNA was used to numerically simulate the expansion of the projectile body and the natural fragment formation process of this caliber submerged shell.Through the analysis of the formation mechanism of natural fragmentation of the projectile body combined with the characteristics of high bore pressure and high overload of the submerged shell launching,the projectile-body structure with simple structure and low processing cost was designed,which can be used for high bore pressure and high overload.The numerical simulation of the formation process of natural fragmentation of the designed projectile-body structure was carried out.The numerical simulation results show that this kind of projectile-body structure has high feasibility.The breakage test results show that the number of effective fragments formed by this kind of projectile body structure can be increased by 16.5%.
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