Temporally and Spatially Resolved Reflected Overpressure Measurements in the Extreme Near Field.
Temporally and Spatially Resolved Reflected Overpressure Measurements in the Extreme Near Field.
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DOI：
10.3390/s23020964
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发表时间：
2023-01-14
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影响因子：
--
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中科院分区：
文献类型：
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抗爆结构和防护系统的设计需要对爆炸波施加给结构的荷载有一个明确的认识。虽然经验方法可以可靠地预测远场的这些载荷，但目前对非常近场的压力缺乏了解，其中基于物理的数值模拟和半经验快速运行的工程模型预测可能会有一个数量级的变化。在本文中，我们提出了一个实验设备的设计，能够提供明确的空间和时间分辨的反射压力数据在极端近场（米/公斤）。爆炸机理和表征（MaCE）设施是现有爆炸载荷表征（CoBL）设施的特定近场演变，该设施使用嵌入刚性靶板中的霍普金森压杆阵列。使用马氏体时效钢压力棒和专门设计的应变片将测量能力从600 MPa提高到1800 MPa，并使用33个径向网格压力棒将100 mm半径测量区域的空间分辨率从25 mm提高到12.5 mm。此外，压杆直径从10 mm减小到4 mm，这大大减少了应力波的色散，增加了有效带宽。这使得能够在压力测量中观察高频特征，这对于验证通过数值建模预测的近场瞬态效应和开发有效的爆炸缓解方法至关重要。
The design of blast-resistant structures and protective systems requires a firm understanding of the loadings imparted to structures by blast waves. While empirical methods can reliably predict these loadings in the far field, there is currently a lack of understanding on the pressures experienced in the very near field, where physics-based numerical modelling and semi-empirical fast-running engineering model predictions can vary by an order of magnitude. In this paper, we present the design of an experimental facility capable of providing definitive spatially and temporally resolved reflected pressure data in the extreme near field ( m/kg). The Mechanisms and Characterisation of Explosions (MaCE) facility is a specific near-field evolution of the existing Characterisation of Blast Loading (CoBL) facility, which uses an array of Hopkinson pressure bars embedded in a stiff target plate. Maraging steel pressure bars and specially designed strain gauges are used to increase the measurement capacity from 600 MPa to 1800 MPa, and 33 pressure bars in a radial grid are used to improve the spatial resolution from 25 mm to 12.5 mm over the 100 mm radius measurement area. In addition, the pressure bar diameter is reduced from 10 mm to 4 mm, which greatly reduces stress wave dispersion, increasing the effective bandwidth. This enables the observation of high-frequency features in the pressure measurements, which is vital for validating the near-field transient effects predicted by numerical modelling and developing effective blast mitigation methods.
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影响因子：
2
作者：
Farrimond, Dain G.;Woolford, Scott;Pope, Dan J.
通讯作者：
Pope, Dan J.
影响因子：
5.1
作者：
Tyas, A;Watson, AJ
通讯作者：
Watson, AJ
影响因子：
2.2
作者：
Tyas, A.;Warren, J. A.;Fay, S.
通讯作者：
Fay, S.
DOI：
10.3390/s22103790
发表时间：
2022-05-17
期刊：
Sensors (Basel, Switzerland)
影响因子：
--
作者：
通讯作者：
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影响因子：
1.8
作者：
Held, Manfred
通讯作者：
Held, Manfred