Assessment of the impact of structural systems on blast wave propagation has traditionally been explored using experimental, analytical, and/or numerical methods. Though numerical modeling techniques have grown in popularity because of their lower cost and high accuracy, experimental testing remains necessary for verifying these models. Issues of scale, equipment capacity, and the availability of research funding continue to limit full-scale testing of subassemblies or complete structures under blast loads. In addition, full-scale blast testing can be time-consuming, allowing only a handful of tests to be conducted. Small-scale airblast experiments offer an economic alternative to full-scale testing, in terms of material and labor requirements. Additionally, these small-scale experiments can be performed rapidly with repeatable results. The use of a novel reusable tabletop small-scale airblast experiment framework is presented for repeatable, cost-effective, quick turnaround testing of airblast scenarios. This novel setup also allows for reflective surfaces to be included as part of the investigation of the behavior of the shockwave-interaction with structures. The goal is to understand the behavior of the blast shockwave interacting with multiple barriers and the effect of pressure due to those barriers; therefore, the scaled structure remains rigid in the experimental and numerical analysis. Three different wall configurations were used to investigate how the presence of multiple barriers affects the shockwave and subsequent observed pressures around and behind the barriers. The explosives used were hemispherical and elevated spherical C4 charges. Pressure gauges were used to read pressures in front of, between, and behind the barriers on the tabletop. The airblast effects such as pressure and impulse, from the scaled experiments are presented and compared to the analytical predictions using a hydrocode model. It was found that multiple walls are measurably effective in reducing the pressure shockwave compared to no walls. The use of single and double walls reduced the pressure by 50% and 25%, respectively, compared to having no walls at the same scaled distance. The hydrocode model results were generally in agreement with the experimental data. The results can allow engineers and decision makers to understand the impact that properly distanced multiple barriers can have on protection from blast events.

中文翻译：

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用于评估多个周界墙屏障对冲击波传播影响的小规模鼓风测试


传统上使用实验、分析和/或数值方法来探索结构系统对爆炸波传播的影响的评估。尽管数值建模技术因其成本较低和精度较高而越来越受欢迎，但验证这些模型仍然需要进行实验测试。规模、设备能力和研究经费的可用性问题继续限制爆炸载荷下组件或完整结构的全面测试。此外，全面的爆炸测试可能非常耗时，只能进行少量测试。就材料和劳动力要求而言，小规模喷砂实验为全面测试提供了一种经济的替代方案。此外，这些小规模实验可以快速进行并获得可重复的结果。提出了一种新颖的可重复使用的桌面小型鼓风实验框架，用于对鼓风场景进行可重复、经济高效、快速的周转测试。这种新颖的设置还允许将反射表面作为冲击波与结构相互作用行为研究的一部分。目标是了解爆炸冲击波与多个障碍物相互作用的行为以及这些障碍物造成的压力影响；因此，缩放结构在实验和数值分析中保持刚性。使用三种不同的墙壁配置来研究多个障碍物的存在如何影响冲击波以及随后观察到的障碍物周围和后面的压力。使用的炸药是半球形和高球形C4装药。压力表用于读取桌面障碍物前面、之间和后面的压力。 展示了来自缩放实验的压力和脉冲等鼓风效应，并与使用水力编码模型的分析预测进行了比较。研究发现，与无墙壁相比，多个墙壁在减少压力冲击波方面具有显着的效果。与相同比例距离下没有墙壁相比，使用单壁和双层墙壁分别减少了 50% 和 25% 的压力。 Hydrocode模型结果与实验数据基本一致。结果可以让工程师和决策者了解适当距离的多个屏障对爆炸事件防护的影响。