Numerical Analysis of Blast Behavior for Non-ideal Explosive ANFO in Shock-Tube Test

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Hyun-Seop Shin, Sung-Wook Kim, Jae-Heum Moon, Gang-Kyu Park
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Abstract

In an explosion test using a shock tube, the behavior of pressure waves can be reproduced with high reliability. However, the explosion in a shock tube occurs in a confined space. It is difficult to predict the behavior of pressure waves and its effect on various concrete specimens by using the research findings related to free-field explosions. Moreover, few studies have focused on explosive-driven shock tubes. In this study, the behavior of pressure waves in a shock tube was numerically analyzed using a finite-element analysis program. The explosive used to generate the pressure waves was an ammonium nitrate fuel oil (ANFO), which exhibits non-ideal explosion characteristics. The Jones–Wilkins–Lee (JWL) and ignition-and-growth (I&G) equations of state were used for blast-pressure calculation. The analysis results were affected by factors such as the release rate of explosive energy and the development of the pressure waves in the confined explosion. The blast behaviors, such as the low release rate of explosive energy and the resulting increase in the impulse, were analyzed using the ignition-and-growth equation. The impulse produced during the development of waves reflected by the block installed at the tube inlet exceeded that produced by the tube wall. Such behaviors that occurred at the beginning of a blast affected the process of wave propagation along the shock tube and the wave reflection due to the test specimen at the outlet of the shock tube. In this study, the blast behavior in the shock tube, which could be referenced for the analysis of blast overpressure and its effect on concrete specimens, was numerically analyzed. Further research on the structural behaviors of concrete specimens due to blast overpressure is needed.

Abstract Image

非理想爆炸物 ANFO 在冲击管试验中的爆炸行为数值分析
在使用冲击管进行的爆炸试验中,压力波的行为可以非常可靠地再现。然而,冲击管中的爆炸发生在密闭空间中。利用与自由场爆炸相关的研究成果很难预测压力波的行为及其对各种混凝土试样的影响。此外,很少有研究关注爆炸驱动的冲击管。本研究使用有限元分析程序对冲击管中的压力波行为进行了数值分析。用于产生压力波的炸药是硝酸铵燃料油(ANFO),它具有非理想爆炸特性。爆炸压力计算采用了琼斯-威尔金斯-李(JWL)和点燃与增长(I&G)状态方程。分析结果受到爆炸能量释放率和密闭爆炸中压力波发展等因素的影响。使用点火-增长方程分析了爆炸行为,如爆炸能量的低释放率和由此产生的冲量增加。安装在管道入口处的块体在反射波的发展过程中产生的冲量超过了管壁产生的冲量。爆炸开始时出现的这种行为影响了波沿冲击管传播的过程以及冲击管出口处试样产生的波反射。本研究对冲击管中的爆炸行为进行了数值分析,可作为分析爆炸超压及其对混凝土试件影响的参考。关于爆炸超压对混凝土试件结构行为的研究还需进一步深入。
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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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