摘要随着弹体侵彻目标的防护能力的逐渐提高,对侵彻混凝土的弹体的材料和性能的要求也随之增高。目前,研究高速侵彻战斗部从而达到侵彻目的是可实现的主要的技术途径之一。但是随着侵彻速度的提高,侵彻战斗部可能会发生破坏或失效,因此,研究弹体在高速条件下侵彻混凝土的过程中弹体的质量损失是十分必要的。在本文的研究中把弹丸侵彻混凝土的整个过程分为三个阶段来描述,即开坑阶段、有质量损失的侵彻阶段和无质量损失的侵彻阶段,分别对这三个阶段进行分析和计算。研究结果表明,由于弹头形状改变导致而引发的质量损失所占比重较大;本文利用LS-DYNA有限元分析软件对弹体高速侵彻进行模拟,在模拟中选用了三种不同弹头形状和三种不同侵彻速度进行仿真分析和计算。29160
关键词 高速侵彻 质量损失 混凝土 数值模拟
毕业论文设计说明书外文摘要
Title The Mass Loss Effect Study On The High Velocity
Penetrating Into Concrete Targets
Abstract
As the projectile penetration target protection ability gradually improve, the penetration of concrete material and performance requirements of projectile subsequently improve too. At present, the research on high speed penetration warhead to achieve penetration is one of the major technical way can be realized,But with the improvement of penetration velocity, penetration warhead damage or failure may occur,Therefore, research on the projectile in the process of concrete under the condition of high speed penetration shot body mass loss is very necessary。
In this paper, the projectile penetration of concrete described in the whole process is pided into three stages, stage of open pit, penetration stage of quality loss and no penetration stage of quality loss and analyze the three stages and calculation Respectively. The results show that the quality loss caused due to change shape warheads accounts for a large proportion,This paper uses Ls-dyna finite element analysis software to simulate high-speed projectile penetration,and chooses three different shapes and three different penetration warhead simulation analysis and calculation speed.
Keywords High-velocity,penetration,Mass-loss,Concrete,Numerical Simulation
目 录
1 绪论 2
1.1 研究背景及意义 2
1.2 国内外对高速侵彻问题的研究现状及发展趋势 4
1.2.1 弹体高速侵彻混凝土的研究现状 4
1.2.2 弹体高速侵彻混凝土的研究 6
1.2.3 弹体高速侵彻混凝土研究和发展方向 7
1.3 本文的主要工作 8
2 分析高速条件下弹体的侵彻作用 9
2.1 弹体质量损失分析 9
2.2 侵彻过程分析 10
2.3 基本假设 11
2.4 建立基本方程 11
2.4.1 由动量定理建立方程 11
2.4.2 弹体质量变化方程 12
2.4.3 弹体侵彻各阶段方程 14
2.4.4 侵彻质量损失计算及分析 15
2.5 本章小结 16
3 弹体高速侵彻混凝土的数值模拟 17
3.1 引言 17
3.2 LS-DYNA软件简介及算法 18
3.2.1 LS-DYNA动力学分析软件简介 18
3.2.2 LS-DYNA基本算法 18
3.3 侵彻弹靶的几何模型 19
3.3.1 弹体模型 20 LS-DYNA高速侵彻混凝土弹体质量损失特性研究:http://www.youerw.com/wuli/lunwen_24280.html