Study on Interior Ballistic Characteristics of Cased Telescoped Ammunition with Dynamic Impact Engraving Considered

doi:10.12382/bgxb.2021.0519

Abstract

Abstract: To accurately predict the interior ballistic characteristics of telescoped ammunitions，the deformation，failure mode，and groove formation mechanism of the nylon cartridge belt during the dynamic impact engraving process of the telescoped ammunition are studied. A three-dimensional finite element model considering the complex structure of the engraving system and the dynamic impact characteristics of the telescoped projectile is established by using LS-DYNA software，and simulation is performed.On this basis，considering the new principle of two-stage ignition and programmed combustion of the ammunition，an integrated model for the initial interior ballistics of the ammunition during and after engraving is also established. The numerical results are compared with the experimental results.The results show that the fracture failure mode of the belt material under the action of rifling is mainly shear failure，and the engraving process can be divided into two stages. The belt material is deformed significantly due to the extrusion of rifling during both stages，so the corresponding extrusion resistance is also evident. Eventually，the dynamic impact extrusion resistance of the projectile is expressed by fitting. The results of the model are in good agreement with the test results，verifying the accuracy of the model and providing a useful reference for the design of the charge structures of such novel ammunition.

Key words: casedtelescopedprojectile, dynamicimpact, two-stageignition, interiorballisticmodel

CLC Number:

TJ012.1

CHANG Renjiu, XUE Xiaochun, YU Yonggang. Study on Interior Ballistic Characteristics of Cased Telescoped Ammunition with Dynamic Impact Engraving Considered[J]. Acta Armamentarii, 2022, 43(9): 2388-2398.

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