端部起爆下空腔装药对离散杆驱动特性的影响研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (17) : 58-62.

论文

魏继锋，魏锦

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Study on driving characteristics of discrete rod by hollow cylindrical charge with one end initiation

WEI Ji-feng WEI Jin

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摘要

研究端部起爆下不同空腔直径装药的爆轰输出特性及对杆条驱动特性的影响。采用非线性动力学软件LS-DYNA，运用流固耦合算法，对不同空腔直径装药下离散杆的爆轰驱动过程进行数值模拟，分析空腔直径大小对爆轰产物压力分布、离散杆速度与微元速度分布以及离散杆变形的影响。仿真结果表明，随着空腔直径的增大，空腔内稀疏效应逐渐增强，使得爆轰输出压力沿轴向趋同；杆条速度随空腔直径的增大非线性减小，杆条微元速度梯度逐渐减小；空腔直径越大，杆条平直度越好，而杆条平直度与杆条速度呈反向变化规律，因此离散杆的最优作用效果要综合权衡飞散速度与平直度。

Abstract

By changing hollow diameter of cylindrical charge with one end initiation, detonation output characteristics and its influence on driving characteristics of discrete rod was studied. Numerical simulation of the detonation driving rods process was carried out with the nonlinear dynamic analysis program LS-DYNA and hydro-solid coupling method. The influence of different hollow diameter on pressure distribution of detonation product, velocity, micro-unit velocity distribution and effective length of discrete rod was analyzed. With the increase of hollow diameter, strong sparse effect makes the pressure along the axial direction gradually the same. Resultant velocity of discrete rod decreases nonlinearly with hollow diameter increasing and micro-unit velocity gradient decreases. As hollow diameter increasing, the flatness of rod becomes better, whereas the flatness shows a reverse variation to the velocity of rod. The optimal effect of discrete rod should consider its velocity and flatness synthetically.

关键词

爆炸力学

/ 离散杆 / 空腔装药 / 驱动特性

Key words

explosion mechanics

/ discrete rod / hollow cylindrical charge / driving characteristics

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导出引用

魏继锋，魏锦. 端部起爆下空腔装药对离散杆驱动特性的影响研究[J]. 振动与冲击, 2015, 34(17): 58-62

WEI Ji-feng WEI Jin. Study on driving characteristics of discrete rod by hollow cylindrical charge with one end initiation[J]. Journal of Vibration and Shock, 2015, 34(17): 58-62

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