冲击载荷作用下火工分离保护装置的建模与分析

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摘要

为了模拟空间火工分离保护装置冲击载荷下的动力学特性，首先，建立了该保护装置的简化模型，计算得到火工分离体的初速度，推导了装置的冲击变形和变形能公式；保护装置分别采用2A12、TC4、蜂窝夹层材料，建立三种材料的多线性本构模型，采用显式动力学求解步分析其冲击响应特性，分析可知，蜂窝夹层材料具有最佳的能量吸收特性，2A12的能量吸收特性介于蜂窝夹层材料和TC4之间，其塑性变形量适中；应变能释放和冲击碰撞的耦合分析可知，应变能占比小，体现为振荡衰减的过程，结构的冲击响应特性主要由碰撞冲击导致；试验表明，该火工分离保护装置的瞬态动力学过程与分析一致，局部最大应力为302MPa，冲击响应谱最大值为3242g，满足有效载荷的可靠解锁分离要求。

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	曹乃亮徐宏辛宏伟李志来

关键词 ：爆炸冲击 ')" href="#">

爆炸冲击 , 火工分离装置 , 有限元法 , 能量吸收

Abstract：In order to simulate the dynamics of pyrotechnics separation protecting device under explosion shock, firstly the simplified model is built, the initial velocity of the detached body is obtained; The plastic deformation and deformation energy of plastic hinge under clamped boundary are derived, the protecting device material is allocated with aluminum alloy, titanium alloy and honeycomb core material, the multi-linear constitutive model of the three material is built; the analysis of impulse response is carried out using dynamic explicit method; results show that, honeycomb core has the best energy absorption capability, and the energy absorption capability of aluminum alloy is between titanium alloy and honeycomb core, its plastic deformation is moderate; coupling analysis of strain energy release and explosion shock indicates: the proportion of strain energy that is in the form of decrement of oscillation is small, impulse response specificity is caused primarily by explosion shock; experiment shows that instantaneous dynamics process is consistent with the analysis result, maximum stress is 302MPa, the maximum shock response spectrum (SRS) is 3242g, and fulfill the requirement of payload separation process.

Key words： Explosion shock Pyrotechnics separation device Finite element Energy absorption

收稿日期: 2013-10-09 出版日期: 2015-04-25

引用本文:

曹乃亮徐宏辛宏伟李志来. 冲击载荷作用下火工分离保护装置的建模与分析[J]. 振动与冲击, 2015, 34(8): 20-25.
CAO Nailiang XU Hong XIN Hongwei LI Zhilai. Modeling and analysis of a Pyrotechnics separation protecting device under explosion shock. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(8): 20-25.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2015/V34/I8/20

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