Theoretical and numerical investigations on the headspace of cartridge cases considering axial deformation and movement  

作　　者：Song Cai Chen-lei Huang Kun Liu Zhong-xin Li Zhi-lin Wu 

机构地区：[1]School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China

出　　处：《Defence Technology（防务技术）》2020年第1期88-95,共8页Defence Technology

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11372137 and 11602025);Equipment Development Department of the Central Military Commission of China(Grant No.301030905)。

摘　　要：The cartridge case headspace is the axial clearance between the cartridge and bolt of an automatic weapon,and influences the reliability and security of the weapon.Accordingly,theoretical and numerical studies were conducted to analyze the dynamic response of cartridge cases during internal impact considering the initial radial clearances between the cartridge case and chamber.A theoretical model was proposed to predict the cartridge case headspace considering both the deformation and movement of the cartridge case and confirmed by the results of nonlinear finite element simulations.The differences between the results of the conventional static model and the dynamic model were then comprehensively evaluated.The effects of the angle between the cartridge and chamber,the cartridge case material,and the intermal impact pressure on the predicted headspace value were also analyzed.The dynamic response of the cartridge case predicted by the dynamic model was more accurate than that predicted by the conventional static model.The internal impact pressure,pressure change rate,and cartridge material were all found to affect the predicted headspace.

关 键 词：Cartridge case HEADSPACE RADIAL CLEARANCE Thick-walled CYLINDER Dynamic response 

分 类 号：TJ410[兵器科学与技术—火炮、自动武器与弹药工程]