穿甲弹在侵彻过程中的过载问题分析

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哈尔滨工业大学工学硕士学位论文
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摘 要 ............................................................................................................................... I Abstract............................................................................................................................. II 第 1 章 绪 论 ................................................................................................................ 1 1.1 研究背景及意义 ................................................................................................ 1 1.2 国内外发展状况 ................................................................................................ 1 1.2.1 高速侵彻 .................................................................................................. 1 1.2.2 国外研究现状 .......................................................................................... 2 1.2.3 国内研究现状 .......................................................................................... 3 1.3 存在问题 ............................................................................................................ 3 1.4 本文研究的主要内容 ........................................................................................ 4 第 2 章 弹体侵彻的基础理论 ........................................................................................ 6 2.1 混凝土侵彻相关理论 ........................................................................................ 6 2.1.1 侵彻模式 .................................................................................................. 6 2.1.2 空腔膨胀理论 .......................................................................................... 7 2.1.3 计算公式的选择 ...................................................................................... 8 2.2 理论计算验证 .................................................................................................... 9 2.2.1 不同速度的卵形弹体侵彻情况的理论验证 .......................................... 9 2.2.2 不同 CRH 的弹体验证情况 ...................................................................11 2.2.3 混凝土靶体强度影响的理论验证 ........................................................ 13 2.3 本章小结 .......................................................................................................... 16 第 3 章 弹体侵彻圆柱靶的数值模拟 .......................................................................... 17 3.1 引言 .................................................................................................................. 17 3.2 选用的材料模型 .............................................................................................. 17 3.2.1 弹体材料模型 ........................................................................................ 18 3.2.2 靶体的材料模型 .................................................................................... 19 3.3 弹靶材料参数的确定 ...................................................................................... 23 3.3.1 弹体材料参数的确定 ............................................................................ 23 3.3.2 靶体材料参数的确定 ............................................................................ 23 3.4 弹靶有限元模型 .............................................................................................. 24 3.5 不同速度侵彻情况 .......................................................................................... 25 3.5.1 数值模拟结果 ........................................................................................ 25 3.5.2 结果验证 ................................................................................................ 30 3.6 本章小结 .......................................................................................................... 31 第 4 章 弹体侵彻情况的影响因素研究 ...................................................................... 32 4.1 不同 CRH 的情况 ............................................................................................ 32 4.1.1 弹靶几何模型 ........................................................................................ 32 4.1.2 数值模拟结果 ........................................................................................ 32 4.1.3 模拟结果分析 ........................................................................................ 38
硕士学位论文 穿甲弹在侵彻过程中的过载问题分析
硕 士 研 究 生： 曹雨 导 师： 曾凡林副教授
申 请 学 位： 工学硕士 学 科： 固体力学
所 在 单 位： 航天学院 答 辩 日 期： 2013 年 7 月 授予学位单位： 哈尔滨工业大学
Classified Index: O385 U.D.C: 531
硕士学位论文
穿甲弹在侵彻过程中的过载问题分析
ANALYSIS OF OVERLOAD PROBLEM IN THE PROCESS OF PENETRATION OF THE PROJECTILE 曹雨
哈尔滨工业大学 2013 年 7 月
国内图书分类号： O385 国际图书分类号：531
学校代码： 10213 密级：公开
I
哈尔滨工业大学工学硕士学位论文
Abstract
Studying on projectile penetration problem has an important guiding significance for projectile design, it is helpful to understand the penetration characteristics, and better for the national defense service. This paper mainly studies the penetration of egg-shaped projectile made of 4340Steel in different speed and the different ratios of warheads curvature radius and diameter to concrete of different compressive strength, gaining penetration principle of penetration depth and overload acceleration. We study and verify from two aspects of theoretical analysis and numerical simulation. The theoretical analysis uses Forrestal formula and numerical simulation uses the nonlinear software of impact dynamics—LS-DYNA to simulate different conditions. Firstly through the theoretical analysis, we get ovoid projectile （ CRH=3 ） penetration situation at the speed of 400-1200m/s, knowing that in the lower speed penetration depth increases with the penetration velocity increasing and acceleration increases with the increase of speed. Verify the penetration of different CRH and different concrete targets finding that CRH is larger, that is the bullet shape more pointed, projectile penetration depth is larger, acceleration shorter and concrete target strength is more obvious on projectile penetration that target strength is greater and penetration depth is relatively smaller with the acceleration changing larger. For the penetration problems with different situations, we firstly simulate the simulation of different speed, obtaining the simulation curve of penetration depth of the time-history and acceleration of projectile. Compared with experimental results, proving the reliability of numerical simulation. Then simulating the penetration condition of different CRH projectile, different target materials and different ratio of length to diameter, the simulation results show that: the warhead more pointed, target hinders smaller on projectile penetration; target strength is greater, the greater the obstacles is; in a certain range, the ratio of length to diameter is larger, the smaller target block is on the penetration. Keywords: projectile, penetration, overload, theoretical analysis, numerical simulation
Dissertation for the Master Degree in Engineering
ANALYSIS OF OVERLOAD PROBLEM IN THE PROCESS OF PENETRATION OF THE PROJECTILE
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