Performance Analysis and Improved Design of Cartridge Extracting and Sealing of Cased Telescoped Ammunitions

doi:10.12382/bgxb.2024.0555

Abstract

Abstract:

For the cartridge extracting and sealing of cased telescoped ammunitions, a structural concept of composite cartridge is designed, and the performance of cartridge extracting and sealing is analyzed. The results show that the performance of cartridge sealing among the cartridge base, cartridge cylinder and breechblock is good under a maximum chamber pressure of 380MPa. But the performance of cartridge sealing between the end cap of the cartridge and the barrel is weak, and the plastic deformation of the front end of the cartridge cylinder is larger, which may result in the damage to cartridge cylinder after extracting. Based above, an improved structural scheme of the composite cartridge is put forward and compared with the former scheme. The results show that the effective contact area between the end cap and the barrel can be increased to improve significantly the performance of cartridge sealing. The plastic deformation of the front end of cartridge cylinder is significantly reduced, and the local damage condition is significantly improved. The end cap of cartridge and the cartridge base are both separated from the chamber after the chamber pressure unloading, which can lead to the result of almost zero extraction force.

Key words: cased telescoped ammunition, composite cartridge, zero shell pulling force, airtight performance

CLC Number:

TJ410.3

WANG Hongjin, NING Bianfang, ZHANG Guoping, ZHANG Shiming. Performance Analysis and Improved Design of Cartridge Extracting and Sealing of Cased Telescoped Ammunitions[J]. Acta Armamentarii, 2024, 45(S1): 112-119.

Figures/Tables 20

Fig.1 Geometric model

Fig.2 Grid cells

Table 1 Material parameters

部件	密度/ (kg·m^-3)	弹性模量/MPa	泊松比	屈服极限/MPa
身管、端盖、底座、闩体	7850	2.06×10⁵	0.3	1180
药室	7850	2.06×10⁵	0.3	1370

Fig.3 Tensile stress-strain curve of cartridge cylinder

Fig.4 Loading curves of two chamber pressures

Fig.5 Preliminary design of cartridge

Fig.6 Combined deformations at typical moments

Fig.7 Stresses at typical moments

Fig.8 Contact pressures of the end cap and the barrel,and the cartridge base and the breechblock (only the pressures greater than the chamber pressureare shown)

Fig.9 Pressure-time curve at the contacting point between end cap and barrel

Fig.10 Pressure-time curve at the contacting point between cartridge base and breechblock

Fig.11 The improved scheme of cartridge

Fig.12 The structural schemes of end cap before and after improvement

Fig.13 Combined deformations at typical moments

Fig.14 Stresses at typical moments

Fig.15 Pressure-time curve at the contacting point between end cap and barrel

Fig.16 Pressure-time curve at the contacting point between cartridge base and breechblock

Fig.17 Comparison of effective contact areas of end cap before and after improvement

Fig.18 Residual deformation of front end of plastic cartridge before and after improvement (under chamber pressure of 450MPa)

Fig.19 Radial contact force curves among the end cap, the cartridge base and the chamber

References 21

[1]	贺岩. 英、法合作研制的45毫米埋头弹自动炮[J]. 现代兵器, 1996(12): 16-20.
	HE Y. 45mm cased telescoped armament system jointly developed by Britain and France[J]. Modern Weaponry, 1996(12): 16-20. (in Chinese)
[2]	沈卫. 埋头弹火炮及其弹药技术[J]. 现代军事, 2004(5): 48-50.
	SHEN W. Cased telescoped ammunitiongun and its ammunition technology[J]. Modern Military, 2004(5): 48-50. (in Chinese)
[3]	荷露斯. 轻装重火力-埋头弹药武器系统与装甲战斗车辆的火力革新[J]. 坦克装甲车辆, 2017(1): 34-38.
	HE L S. Lightweight heavy firepower-firepower innovation of cased telescoped armament system and armored combat vehicles[J]. Tank &Armoured Vehicle, 2017(1): 34-38. (in Chinese)
[4]	王笑梦. “小车大炮”传统下的科幻新车——法国新型“美洲豹”装甲侦察车[N]. 中国国防报, 2018-05-29( 4).[2024-07-07].
	WANG X M. A sci-fi new car under the tradition of “car cannon”—the new French Jaguar armored reconnaissance vehicle[N]. China National Defense News, 2018-05-29( 4).[2024-07-07]. (in Chinese)
[5]	董彦诚, 岳文龙, 宿明臣, 等. 埋头弹火炮内弹道及装药分析[J]. 火炮发射与控制学报, 2011(1):14-16.
	DONG Y C, YUE W L, SU M C, et al. Interior ballistics and charge analysis of CTA gun[J]. Journal of Gun Launch & Control, 2011(1):14-16. (in Chinese)
[6]	王加刚, 余永刚, 郭飞, 等. 多参数变化对埋头弹火炮内弹道性能的影响[J]. 弹道学报, 2015, 27(2): 69-73.
	WANG J G, YU Y G, GUO F, et al. Effects of multi-parameter change on Interior ballistics properties of cased telescoped ammunition gun[J]. Journal of Ballistics, 2015, 27(2):69-73. (in Chinese)
[7]	郭俊廷, 余永刚. 埋头弹药二次点火过程复杂流场特性[J]. 兵工学报, 2024, 45(7): 2282-2293. doi: 10.12382/bgxb.2023.0499
	GUO J T, YU Y G. Complex flow field characteristics inside combustion chamber during the secondary ignition process of CTA[J]. Acta Armamentarii, 2024, 45(7): 2282-2293. (in Chinese) doi: 10.12382/bgxb.2023.0499
[8]	师军飞, 钱林方, 陈光宋, 等. 基于数字图像相关原理的埋头弹程序燃烧特性试验研究[J]. 兵工学报, 2024, 45(4): 1047-1059. doi: 10.12382/bgxb.2023.1174
	SHI J F, QIAN L F, CHEN G S, et al. Research on the procedural burning characteristics of cased telescoped ammunition based on digital image correlation principle[J]. Acta Armamentarii, 2024, 45(4): 1047-1059. (in Chinese) doi: 10.12382/bgxb.2023.1174
[9]	熊佳敏, 陆欣. 埋头弹装药药粒破碎模型研究[J]. 兵器装备工程学报, 2022, 43(8): 140-145.
	XIONG J M, LU X. Study on model of grain fracture in charge structure of cased telescoped ammunition[J]. Journal of Ordnance Equipment Engineering, 2022, 43(8): 140-145. (in Chinese)
[10]	熊佳敏, 陆欣. 发射药冲击破碎对埋头弹装药燃烧和内弹道性能影响的数值模拟[J]. 火炸药学报, 2023, 46(4): 352-360.
	XIONG J M, LU X. Numerical simulation of the effect of impact crushing of propellant grains on the combustion and internal ballistic of the CTA[J]. Chinese Journal of Explosives & Propellants, 2023, 46(4): 352-360. (in Chinese)
[11]	张志涛, 张海峰, 王颖, 等. 某小口径埋头弹弹体破碎性研究[J]. 弹道学报, 2024, 36(1): 78-84.
	ZHANG Z T, ZHANG H F, WANG Y, et al. Research on fragmentation of small-caliber cased telescoped ammunition[J]. Journal of Ballistics, 2024, 36(1): 78-84. (in Chinese)
[12]	刘建斌, 梁世瑞, 黄强. 新型埋头弹火炮[J]. 火炮发射与控制学报, 2004(1):58-61.
	LIU J B, LIANG S R, HUANG Q. A new type of CTA gun[J]. Journal of Gun Launch & Control, 2004(1):58-61. (in Chinese)
[13]	佟凯, 李强. 新型埋头弹火炮自动机结构设计与仿真[J]. 应用技术, 2015(3): 41-43.
	TONG K, LI Q. The design and simulation of new automat structure for the case telescoped ammunition gun[J]. Applied Technology, 2015(3): 41-43. (in Chinese)
[14]	王加刚, 余永刚, 曹韩学, 等. 埋头弹药发射过程药筒力学特性分析[J]. 应用力学学报, 2016, 33(4): 640-645.
	WANG J G, YU Y G, CAO H X, et al. The mechanical process analysis of CTA cartridge[J]. Chinese Journal of Applied Mechanics, 2016, 33(4): 640-645. (in Chinese)
[15]	卫丰, 张光. 药筒发射应力和抽壳力的有限元分析[J]. 爆炸与冲击, 2001, 21(1):72-75.
	WEI F, ZHANG G. The FEA analysis for emission stresses of cartridge cases and forces for extraction[J]. Explosion and Shock Waves, 2001, 21(1):72-75. (in Chinese)
[16]	任弘毅, 王宏金, 郭竞尧, 等. 埋头弹抛壳力仿真分析[J]. 火炮发射与控制学报, 2024, 45(3): 58-62,79.
	REN H Y, WANG H J, GUO J Y, et al. Simulation analysis of shell-throwing force ofcased telescoped ammunition[J]. Journal of Gun Launch & Control, 2024, 45(3): 58-62,79. (in Chinese)
[17]	谭庆, 李强, 胡建波, 等. 一种新型埋头弹闭气结构设计及仿真分析[J]. 火炮发射与控制学报, 2022, 43(2): 63-68.
	TAN Q, LI Q, HU JB, et al. Design and simulation analysis of a new gas seal structure for cased telescoped ammunition[J]. Journal of Gun Launch&Control, 2022, 43(2): 63-68. (in Chinese)
[18]	贾宸, 戴劲松, 王茂森. 沟槽式密封衬套结构性能分析[J]. 火炮发射与控制学报, 2019, 40(3):29-33.
	JIA CDAI J S, WANG M S. Analysis of structural performance of groove-type sealing bush[J]. Journal of Gun Launch & Control, 2019, 40(3): 29-33. (in Chinese)
[19]	刘强, 周克栋, 宋伟, 等. 某埋头弹机枪退壳系统设计与动力学分析[J]. 北京理工大学学报, 2023, 43(12): 1265-1273.
	LIU Q, ZHOU K D, SONG W, et al. Dynamic analysis and design of the ejection system of a cased telescoped ammunition machine gun[J]. Transactions of Beijing Institute of Technology, 2023, 43(12): 1265-1273. (in Chinese)
[20]	黄岚, 韩晓明, 李强, 等. 埋头弹火炮活动药室密封装置的研究[J]. 火炮发射与控制学报, 2017, 38(4): 19-23.
	HUANG L, HAN X M, LI Q, et al. Research on the sealing system of rotating chamber of CTA gun[J]. Journal of Gun Launch & Control, 2017, 38(4): 19-23. (in Chinese)
[21]	张浩, 陆欣, 余永刚, 等. 某口径埋头弹火炮的密封与装药设计[J]. 兵工学报, 2006, 27(4): 630-633.
	ZHANG H, LU X, YU Y G, et al. Design for the seal system and charge of a CTA gun[J]. Acta Armamentarii, 2006, 27(4): 630-633. (in Chinese)