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串联发射弹丸挤进过程数值仿真与分析
Numerical Simulation and Analysis of Engraving Process with Serial Launch Method
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中文摘要:
      为研究串联发射的弹丸在不同起始速度下动态挤进膛线的力学机理与运动特点,以30 mm火炮为对象分析了串联发射方式的内弹道物理过程,建立了弹丸与坡膛的有限元模型,采用LS-DYNA软件进行了挤进过程的有限元仿真。研究结果表明: 挤进过程中,弹带变形规律不受挤进起始速度的影响,均是逐步被膛线刻槽并发生塑性变形; 起始速度由5 m·s-1增加至400 m·s-1,弹带等效应力峰值从611.8 MPa升高至717.5 MPa,弹带塑性应变最大值从0.89降低至0.75,挤进阻力峰值从为20.3 kN提高至22.9 kN,挤进完成后的摩擦阻力从0提高至3.5 kN,挤进起始速度增加导致了弹带材料应变率、塑性流动应力与挤进阻力的改变,影响弹丸挤进后的内弹道过程; 3发弹串联发射时,首发弹20个节点轴向速度的标准差为8.3 m·s-1,后续弹分别为18.2,26.7 m·s-1,后续弹挤进时的振动冲击效应较首发弹显著。
中文关键词: 串联发射  弹带  挤进起始速度  有限元分析  挤进阻力
英文摘要:
      In order to study the mechanical mechanism and movement characteristics of the projectile′s dynamic engraving rifling with serial launch method at different initial velocities, the internal ballistic physics process with serial launch method was analyzed based on the 30 mm caliber artillery. The finite element models of the projectile and barrel were established and the finite element simulation of the engraving process was carried out with LS-DYNA. The results show that the initial engraving velocity has no influence on the deformation of the ammunition belt. The ammunition belt is grooved by the rifling gradually and the plastic deformation occurs. When the initial engraving velocity increases from 5 m·s-1 to 400 m·s-1, the equivalent stress of the ammunition belt increases from 611.8 MPa to 717.5 MPa, the plastic strain peak of the ammunition belt decreases from 0.89 to 0.75, the engraving resistance peak increases from 20.3 kN to 22.9 kN and the friction resistance after the engraving process is completed increased from 0 to 3.5 kN. When the initial engraving velocity increases, the strain rate of the ammunition belt material, the plastic flow stress and the engraving resistance change, which have great influence on the following ballistic process of the projectile after the engraving process. When three projectiles are launched with serial method in turn, the standard deviation of axial velocity of the first projectile is 8.3 m·s-1, and the subsequent two are 18.2 m·s-1 and 26.7 m·s-1 respectively. The vibration shock effects of the subsequent projectiles are more significant than the first one at high engraving velocity.
英文关键词: serial launch method  ammunition belt  initial engraving velocity  finite element analysis  engraving resistance
DOI:10.11943/j.issn.1006-9941.2018.02.003
基金项目:江苏省研究生培养创新工程资助(KYZZ16_0180)
引用文献:杭宇,商飞,孔德仁.串联发射弹丸挤进过程数值仿真与分析[J].含能材料,2018,26(2):123~129
作者单位E-mail
杭宇 南京理工大学机械工程学院, 江苏 南京 210094 hangyu_njust@163.com,shangfei23@126.com 
商飞 南京理工大学机械工程学院, 江苏 南京 210094 shangfei23@126.com 
孔德仁 南京理工大学机械工程学院, 江苏 南京 210094  
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