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摘要在现代的实验手段当中，模拟仿真已经是必不可少的手段之一了。其拥有廉价，快速，仿真程度高等一系列优点。合理的运用软件模拟将给国防事业的快速发展带来极大的优势和便利。常规的模拟壳体破碎的软件为AUTO-DYN,这里将使用另一种常用的软件ANSYS/LS-DYNA来实现壳体动态破碎的模拟。
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本文是基于ANSYS/LS-DYNA进行壳体的动态破碎数值研究，能够有效地再现爆炸膨胀破碎的过程，进而得出每个破片质心的位置、质量、速度矢量数据，并且所得到的破片质量统计分布能够大致与实验数据相吻合。为了体现炸点位置，网格密度，壳体的不同形态对上述结论的影响情况；将采用多个模型进行对比的模拟方法来实现。通过属性的设置来建立实体模型与有限元模型，在通过后期对K文件的修改进以生成仿真使用的文件，最后通过模拟结果与实际的实验数据相比来得出结论。25413
关键词 LS-DYNA 动态破碎 数值模拟 破片形成
毕业设计说明书外文摘要
Title A method based on LS-DYNA simulation shell dynamic crushing
Abstract
Among the modern experimental means, simulation is already one of the indispensable ways.It owns series of advantages including low-cost, fast, and high degree of simulation .Reasonable use of software to simulate will bring the defense industry great advantages and convenience.The conventional analog housing broken software is AUTO-DYN,we will use another popular software ANSYS / LS-DYNA to achieve dynamic simulation of breaking the shell.
This is the case of dynamic crushing numerical study which based on ANSYS / LS-DYNA and the explosive expansion crushing process can be effectively reproduced.Then come to each fragment centroid location, quality, velocity vector data and the quality of the statistical distribution of the fragments obtained can coincide roughly with the experimental data.In order to reflect the position of the burst point, mesh density, different forms of housing prejudice to the above conclusion.It will be used to compare multiple models of simulation methods to achieve.Will establish a solid model and finite element model by setting property. Through the latter part of the K file modifications into the simulation file that will be used to generate.Finally, to conclude by the simulation results compared with actual experimental data.
Keywords LS-DYNA Dynamic broken Numerical Simulation Fragments form
目 次
1 绪论.1
1.1 壳体破碎的背景1
1.2 破碎的问题1
1.3 国内壳体破碎数术1
1.4 国外壳体破碎数值技术2
1.5 现在的发展现状2
1.5.1 普通Lagrange算例3
1.5.2 SPH光滑粒子法算例.3
1.5.3 节点分离法做壳体破碎.3
1.6 选题的意义4
2 理论基础5
2.1 弹丸的破碎效应.5
2.2 破片初速5
2.2.1 理论分析与计算.5
2.2.2 起爆位置对破片初速的影响.7
2.2.3 破片飞散角（抛射角）.8
2.2.4 破片在空气中的运动规律.8
2.3 本章小结16
3 利用LS-DYNA进行计算.18
3.1 LS-DYNA简介18
3.1.1 LS-DYNA发展概况.18
3.1.2 分析能力18
3.1.3 单元库19
3.1.4 接触分析功能19
3.1.5 初始条件、载荷约束19
3.1.6 ALE算法和Euler算法20
3.1.7 LS-DYNA硬件要求.20
3.2 节点分离法简介.20
3.3 建模与求解.21
3.3.1 模型一.21
3.3.2 左端起爆结论30
3.4 模型二.32