摘要
狙击步枪弹挤进过程对狙击步枪射击精度的影响很大,而坡膛的结构参数又是影响挤进过程的一个重要因素。为了揭示坡膛对挤进过程的影响,通过一套设计的试验装置,进行了两种不同坡膛工况下狙击步枪弹的准静态挤进试验,得到坡膛锥角对挤进力的影响情况;采用非线性有限元方法模拟挤进过程,建立弹头挤进过程有限元计算模型,分析仿真结果得到了多组坡膛锥角与挤进力间的关系及其挤进力的组成与各部分所占比重,发现狙击步枪弹不同于其他弹头的挤进特性,同时揭示了狙击步枪弹挤进力的形成机理;依照坡膛、狙击步枪弹的结构特点将挤进过程分为5个阶段,推导出各阶段上挤进力函数表达式;从试验、仿真与理论3个方面研究狙击步枪弹准静态挤进特性,对了解狙击步枪弹挤进过程与弹/枪参数匹配机理具有重要意义。
The engraving process of sniper rifle bullet has a great influence on the firing accuracy of sniper rifle,which is closely related to the bullet ramp. In order to reveal the effect of bullet ramp on engraving process,a test device is designed for the quasi-static engraving experiments under two different conditions of bullet ramp,and the influence of forcing cone angle on engraving force is obtained. A finite element model is established to simulate the engraving process based on the theory of nonlinear finite element. The simulation results reveal the relationship of forcing cone angle and engraving force,the composition of engraving force,the proportion of each part and the formation mechanism of engraving force,and show that the engraving characteristics of sniper rifle bullet are different from those of other bullets. Furthermore,the engraving process is divided into five parts according to the structures of bullet and bullet ramp,and the formula of each part is derived. The quasi-static engraving process of sniper rifle bullet is studied in three aspects: experiment,simulation and theory,which is helpful in understanding the engraving process of sniper rifle bullet,and the matching mechanism of bullet and bullet ramp.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2014年第10期1528-1535,共8页
Acta Armamentarii
基金
国防基础科研项目(A2620061288)
关键词
兵器科学与技术
弹头挤进
坡膛锥角
挤进试验
有限元
弹/枪相互作用
ordnance science and technology
bullet engraving
forcing cone angle
engraving experiment
finite element
interaction of bullet and sniper rifle