毕业论文移动版

摘要本文采用LS-DYNA有限元软件建立不同形状预制破片侵彻圆管的数值仿真模型，研究了圆柱形、球形、立方形预制破片在不同工况下对圆管目标的侵彻效能。仿真计算得到了预制破片对极限穿透速度V50和临界跳弹角φu的影响规律，不同长径比柱形破片速度衰减规律及不同圆管壁厚下三种形状预制破片的速度衰减特性：一定范围内破片侵彻能力随长径比增加而增加；三种形状破片极限穿透速度V50与壁厚δ均呈正相关，壁厚越大，破片速度衰减趋势越快；正侵彻时，圆柱形破片能量损失最小，立方形破片最多。针对破片沿任意方向侵彻圆管目标，V50与着角φ正相关,φu与方向角θ线性负相关；斜侵彻时，柱形破片极限穿透速度V50较球形和立方形低,圆管在轴向侵彻时更容易损坏；柱形破片φu远大于球形、立方体破片，最不容易产生跳弹现象，圆管在周向斜侵彻时更容易产生跳弹现象。74517

毕业论文关键词  不同形状预制破片  圆管  极限穿透速度  临界跳弹角  速度衰减

毕业设计说明书外文摘要

Title       Research about Law of Prefabricated  Fragment Penetrating Pipe         

Abstract LS-DYNA finite element software was used to build up the numerical simulation model of preformed fragment penetration on circular tube target, the penetration performance of circular tube penetrated by cylindrical, spherical, cubic shaped prefabricated fragments in different conditions was studied。 The influencing law of preformed fragment for the ultimate penetration velocity V50 and the critical angle of ricochet φu, velocity attenuation law of cylindrical fragment in different length-diameter ratios and three different shapes was acquired by simulation: Fragment Penetrating ability increases within a certain range with the increase of length-diameter ratios; Three shapes of fragment's V50 showed a positive correlation with the wall thickness δ and the fragment velocity attenuation trend increase with theδ increase; In positive penetration, penetration ability of the cylindrical fragment is strongest, the cube fragment is weakest。 When fragment penetrate circular tube along arbitrary direction, V50 positive correlation with the angle φ, φu negative correlation with direction angle θ; In oblique penetration, cylindrical fragments ultimate penetration velocity V50 was lower than those of sphere and cube, pipe in axial penetration is more easily damaged; Cylindrical Fragment's φu much larger than the spherical, cubic fragments, it is least prone to ricochet phenomenon, pipe more prone to ricochet phenomenon in the circumferential direction。

Keywords  Different shapes Prefabricated Fragment   Circular tube   ultimate penetration velocity   Critical ricochet angle   Velocity attenuation law

目   次

1  绪论  1

1。1  课题研究背景及意义  1

1。2  预制破片研究现状与发展方向  2

1。2。1  破片杀伤战斗部简介  2

1。2。2  不同形状钨合金预制破片国内外研究现状  3

1。2。3  预制破片战斗部发展方向  4

1。3  圆管类目标侵彻研究概述  5

1。3。1  圆管类目标侵彻研究现状  5

1。3。2  侵彻研究方法及技术途径  6

1。4  本文研究的主要内容及工作  6

2  预制破片对圆管目标侵彻作用研究  8

2。1  引言  8

2。2  预制破片侵彻圆管目标理论分析  8

2。3  仿真模型建立及参数选取  12