摘要
为研究埋头弹高速冲击挤进入膛过程的力学机理和运动规律,将某40 mm口径埋头弹火炮作为对象,分析建立其内弹道过程的数理模型,并通过实弹射击试验验证内弹道模型的准确性。考虑界面间的摩擦和接触特性,采用FEM-SPH耦合算法建立了高速冲击挤进模型,将内弹道数值解作为边界条件,通过数值计算得到弹带变形、弹丸运动、弹丸姿态和挤进阻力等变化规律。研究结果表明:所建立的弹道模型准确合理,弹丸的初始上膛速度为78.2 m/s;整个挤进过程分为减速挤进和加速挤进阶段,两阶段之间弹丸处于准静止状态,减速挤进过程中弹丸姿态发生周期性的变化,摆动角幅值不断下降,加速挤进过程,摆动角迅速增大,随着挤进完成摆动角呈现出减小的趋势,完成挤进用时2.65 ms,完成挤进时弹丸速度为73.92 m/s;挤进过程弹带表面温度接近材料熔点;动态挤进阻力呈现两次“上升-下降”过程,最大挤进阻力为95.288 kN,完全挤进时阻力降低并稳定到10 kN。
To study the mechanical mechanism and motion law of the high speed impact engraving process of cased telescoped ammunition,the physical and mathematical interior ballistic models were analyzed and established with a 40mm caliber CTA gun as the research object,and the interior ballistic model was verified by live fire experiments.Considering the friction and contact characteristics between the interfaces,a high-speed impact engraving model was built by the FEM-SPH coupling algorithm,and the numerical solution of the interior ballistics was used as the boundary condition to obtain the change laws of the deformation of the rotating band,projectile motion,projectile attitude and engraving resistance by numerical calculations.The results showed that:the established ballistic model is accurate and reasonable;the initial velocity of the projectile at the bore was 78.2m/s;the entire engraving process can be divided into the decelerating and accelerating phases,and the projectile was in the quasi-static state between the two phases;during the decelerating engraving process,the projectile attitude changed periodically,and the amplitude of the oscillation angle decreased continuously;the oscillation angle increased rapidly during the accelerating engraving process;as the engraving was completed,the oscillation angle showed a decreasing trend;the engraving time was 2.65 ms and the projectile velocity was 73.92 m/s at the completion of engraving;the surface temperature of the rotating band during the engraving process was close to the melting point of the material;there were two"rise-fall"processes in the dynamic engraving resistance with the maximum engraving resistance of 95.288 kN,and the resistance decreased and stabilized at 10 kN at the moment of fully engraving.
作者
师军飞
钱林方
陈红彬
付佳维
SHI Junfei;QIAN Linfang;CHEN Hongbin;FU Jiawei(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;Northwest Institute of Mechanical and Electrical Engineering,Xianyang,712099,Shaanxi,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2023年第3期656-669,共14页
Acta Armamentarii
基金
国家自然科学基金项目(U2141246、11702137)。
关键词
埋头弹
内弹道
冲击挤进
FEM-SPH耦合算法
弹丸姿态
挤进阻力
cased telescoped ammunition
interior ballistic
impact engraving
FEM-SPH coupling algorithm
projectile attitude
engraving resistance
