摘要弹头挤进过程是内弹道过程的重要一环,其过程控制的好坏会直接影响到弹头出枪口的扰动,从而影响到狙击步枪的射击精度。本文针对狙击步枪弹头挤进过程中过盈摩擦、大应变率接触等问题,建立了弹头挤进仿真的有限元模型,运用Hypermesh优化模型网格,并利用大型仿真软件ABAQUS/CAE采用动态显示算法仿真研究了狙击步枪弹头在挤进过程中的特性,获得了不同挤进偏角、弹头自由行程以及弹头壳材料下弹头的应力应变云图、弹头的挤进速度、挤进阻力曲线,并分析得出了相应的变化规律,为改进狙击步枪系统枪弹匹配、提高射击精度提供合理的参考依据。
关键词 弹头挤进 有限元 应力应变 挤进速度 挤进阻力19103
毕业设计说明书(论文)外文摘要
Title The ballistic simulation of engraving process of the sniper rifle
Abstract
The engraving process of projectile is a very important part of interior ballistic. A finite element model of the problem with full friction and large strain rate was established to investigate the engraving process by using Hypermesh for grid optimization. The large-scale simulation software ABAQUS/CAE was used to study the characteristics of projectile engraving into the barrel with dynamic explicit algorithm. The stress and strain contours of the projectiles, engraving velocity and resistance curve were obtained in different engraving angles, free strokes and projectile shell materials. On the basis of the analysis results under different conditions, some reasonable reference data for the improvement of the sniper rifle and bullets matching and shooting accuracy were provided.
Keywords projectile engraving finite element stress and strain engraving velocity and resistance
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