| 自由空气中爆炸冲击波的数值分析 |
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| 作者单位： | ;1.长安大学基建处;2.长安大学建筑工程学院;3.长安大学理学院 |
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| 摘 要： | 为准确模拟自由空气中的爆炸荷载及其特性,采用软件ANSYS/LS-DYNA建立了多组不同药量TNT的爆炸模型,并将结果与TM5-1300、Henrych公式以及Baker公式计算结果进行比较分析。通过多次试算分析,给出了自由空气中建立TNT爆炸模型时由比例距离选用网格尺寸的依据,分析了爆炸相似律立方根表达式的适用性及适用条件,并得到了比例距离为0.1≤z≤3时自由空气中TNT炸药超压峰值的简便计算公式。结果可为自由空气中爆炸荷载的准确数值模拟以及简便计算提供依据。
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| 关 键 词： | 爆炸冲击波 数值分析 自由空气 比例距离 |
Numerical analysis of explosion wave in free air |
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| Affiliation: | ,Department of Infrastructure Management, Chang'an University,School of Civil Engineering, Chang'an University,School of Science, Chang'an University |
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| Abstract: | In order to accurately simulate the blast load and its characteristics in free air,the explosive model of TNT with different dosages were established based on the finite element analysis software ANSYS/LS-DYNA. And the results were compared with formula TM5-1300、Henrych and Baker. The principle of selecting the size of finite element mesh for the air, which based on proportional distance, was obtained according to the results of numerical analysis. The applicability of the cube root expression for blasting similarity theory was analyzed and the application conditions were obtained. A formula for calculating the peak of overpressure in free air at a proportional distance between 0.1 and 3 was given by the numerical results. The numerical results can provide an accurate and convenient method for the blast load determination. |
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| Keywords: | explosion wave numerical analysis free air proportional distance |
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