LS-DYNA高速弹体侵彻多层介质的弹道稳定性研究
毕业论文 关键词 高速侵彻 多层介质 入射条件 质心位置 弹道稳定性
Title Study on the Trajectory Stability of High-Speed
Projectile Penetrating Multilayered Target
Abstract Deep earth penetrating weapons attacking underground targets as background, the trajectory stability problem of high-speed projectile penetrating multilayered concrete/soil target is studied. Mathematic model of penetration into multilayered target is built to describe the motion track of projectile centroid by calculating the resistive force and solving the equations of motion. Based on ANSYS/LS-DYNA, finite element model of high-speed projectile penetrating soil target and layered soil/concrete target are built and simulations of penetration process are made, which describe the process of penetration under different incident conditions. The ricochet law of penetration into soil target under different incident angle is obtained and the influence of incident angel, initial velocity and angel of attack to trajectory stability is analyzed based on the simulations. The influence of projectile structure to the trajectory stability is also analyzed by simulating the penetrations of different centroid locations. This study is instructive to the design of earth penetrating weapons and can also provide some references to the protective design of deep underground defenses.
Keywords High-speed Penetration Multilayered Target Incident Conditions Centroid Location Trajectory Stability
目次
1绪论·1
1.1研究背景及意义···1
1.3本文的研究内容···5
2高速弹体斜侵彻多层介质的理论分析·6
2.1引言···6
2.2弹体的运动学方程6
2.3弹体侵彻阻力的计算·9
2.4弹体侵彻土壤/混凝土多层介质的数学模型·14
2.5本章小结···15
3基于ANSYS/LS-DYNA弹体侵彻的有限元模型16
3.1引言·16
3.2LS-DYNA简介··16
3.3材料模型···18
3.4有限元模型的建立及网格划分··23
3.5接触、失效定义和求解设置·26
3.6K文件的修改和递交计算26
3.7本章小结···26
4高速弹体侵彻土壤的跳弹规律仿真研究···27
4.1引言·27
4.2不同入射角条件下弹体的跳弹规律分析·27
4.3本章小结···29