高g值冲击下轻质结构缓冲吸能研究

发布时间：2018-01-19 23:43

本文关键词： 圆柱壳泡沫铝泡沫铝填充壳弹体侵彻　出处：《中北大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来，高g值碰撞现象已经成为航空、轨道交通、武器装备等领域的重要研究课题。弹载加速度测试装置正是在高g值环境中工作，，其内部的记录电路是重要的核心元件，需要缓冲保护。本文将研究圆柱壳、泡沫铝、泡沫铝填充壳三种结构在高g值冲击条件下对轻质物体（记录电路）的缓冲保护机理。首先，对圆柱壳、泡沫铝受冲击时的吸能理论进行了分析，然后建立了简化的弹载加速度测试装置有限元模型，利用有限元软件ANSYS/LS-DYNA进行缓冲元件的缓冲吸能仿真，分别考虑了圆柱壳壁厚、泡沫铝密度及初始冲击加速度的脉宽和幅值等变量对其缓冲效果的影响，同时对圆柱壳受轴向冲击的屈曲模态进行了简要分析。仿真结果表明：在本实验条件下，壳壁厚越小，缓冲效果越好；泡沫铝密度越小，缓冲效果越好；泡沫铝填充壳中壳壁厚越小、泡沫铝密度越小，其缓冲效果越好；相同缓冲元件在不同加速度下，加速度的脉宽和幅值对其缓冲效果也有一定的影响。最后对弹体侵彻钢板和混凝土的过程进行了模拟仿真，采用前面仿真得出的缓冲效果最好的圆柱壳、泡沫铝、泡沫铝填充壳作为弹载加速度测试装置中的缓冲元件，对弹体侵彻相同靶板过程中三种缓冲元件的缓冲效果进行了分析比较，结果表明:弹体侵彻过程中，在其他条件相同的情况下，泡沫铝填充壳这种组合结构的缓冲效果要优于单泡沫铝及单壳的缓冲效果。
[Abstract]:In recent years, the high g value collision phenomenon has become the aviation, rail transportation, an important research topic in the field of weapon. The missile acceleration testing device is in the high g value environment, its internal recording circuit is the core of the main components need to buffer protection. This paper will research the cylindrical shell, aluminum foam. Three kinds of aluminum foam filled shell structure in high G impact on the condition of light objects (recording circuit) buffer protection mechanism. Firstly, the cylindrical shell, aluminum foam under impact energy absorption theory is analyzed, then a simplified missile acceleration testing device finite element model, using finite element buffer the energy absorption element software ANSYS/LS-DYNA simulation, considering cylindrical shell wall thickness, the impact acceleration of aluminum foam density and the initial pulse width and amplitude variable on the cushioning effect, at the same time on the cylindrical shell under axial impact bending Buckling mode was analyzed. The simulation results show that under the experimental conditions, the shell thickness is smaller, the buffering effect is better; the smaller the density of aluminum foam, cushioning effect; aluminum foam filled shell shell wall thickness is smaller, the smaller the density of aluminum foam, the buffering effect is better; the same element in different buffer acceleration, pulse width and amplitude of acceleration has some influence on the buffering effect. At the end of the penetration of steel and concrete process simulation, using the cylindrical shell, the buffering effect of front obtained the best aluminum foam, cushioning element as the missile acceleration testing device shell filled with aluminum foam in the. The penetration effect of three kinds of buffer buffer components of the same target plate are analyzed and compared, the results show that the penetration process, under the same condition, this kind of composite structure shell filled with aluminum foam The buffer effect is better than that of single foam aluminum and single shell.

【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.4;TQ133.1

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