Impulse Loading of Plates using a Diverging Shock Tube

Isaac, Obed Samuelraj; Jagadeesh, G.

doi:10.1007/s11340-019-00573-5

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…The conical shock tube is a new type of shock tube. It can use smaller charges to obtain stronger shock waves [ 10 ] and replicate the deflection patterns of an impulsive blast loading [ 4 ]. In addition, the driving method also affects the waveform of the shock wave.…”

Section: Discussionmentioning

confidence: 99%

“…With the rapid development of the economy, many important economic facilities are threatened by accidental explosions and terrorist attacks [ 3 ]. The shock tube is a device that can be used to simulate blast waves, which can test most materials and engineering structures [ 4 , 5 , 6 , 7 , 8 ]. Therefore, investigating the overpressure fields in shock tubes has important engineering significance.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Overpressure Fields in a Shock Tube with Multi-Point Initiation

Chen

Ren²,

Zhao³

et al. 2023

Sensors

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Shock tubes can carry out dynamic mechanical impact tests on civil engineering structures. The current shock tubes mostly use an explosion with aggregate charge to obtain shock waves. Limited effort has been made to study the overpressure field in shock tubes with multi-point initiation. In this paper, the overpressure fields in a shock tube under the conditions of single-point initiation, multi-point simultaneous initiation, and multi-point delayed initiation have been analyzed by combining experiments and numerical simulations. The numerical results match well with the experimental data, which indicates that the computational model and method used can accurately simulate the blast flow field in a shock tube. For the same charge mass, the peak overpressure at the exit of the shock tube with the multi-point simultaneous initiation is smaller than that with single-point initiation. As the shock waves are focused on the wall, the maximum overpressure on the wall of the explosion chamber near the explosion zone is not reduced. The maximum overpressure on the wall of the explosion chamber can be effectively reduced by a six-point delayed initiation. When the interval time is less than 10 ms, the peak overpressure at the nozzle outlet decreases linearly with the interval of the explosion. When the interval time is greater than 10 ms, the overpressure peak remains unchanged.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the Overpressure Fields in a Shock Tube with Multi-Point Initiation

Chen

Ren²,

Zhao³

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…The thickness and material of the diaphragm also influence the flow characteristics of the shock tube (Schulz and Skews, 2020;Singh et al, 2020;Sardarzadeh and Zamani, 2021). Isaac and Jagadeesh (2020) conducted blast loading experiments on metal plates with a conical shock tube driven by compressed gas. The results showed that the device can be used as an alternate technique to safely carry out impulsive loading experiments.…”

Section: Introductionmentioning

confidence: 99%

Analysis of flow field in a blast simulator combined-driven by explosive charge and compressed gas

Chen

Ren

Ning³

et al. 2023

Front. Earth Sci.

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The flow field characteristics of blast simulators with the explosive-driven method and compression-driven method have been extensively investigated; however, limited effort has been made to the flow field in blast simulators combined-driven by explosive charge and compressed gas. In this paper, the finite volume method governed by the Navier–Stokes equation based on an explosive detonation and k-omega SST turbulence equation was used to analyze the flow field characteristics of blast simulators with three kinds of drive methods, namely, explosive-driven method, compression-driven method, and combined-driven method. The results show that the numerical method could simulate the flow field characteristics of the blast simulators with the explosive-driven method and compression-driven method accurately by comparing to the experimental data. Also, the influence of air turbulence on the explosion flow field cannot be neglected in the case of long running time. It is obtained that the combined-driven method could increase the pressure peak value of shock waves and extends positive pressure duration effectively, owing to the interaction of the shock waves generated from the explosive detonation and the rarefaction wave formed by rupturing the diaphragm. The first overpressure peak value, the second overpressure peak value, and the positive pressure duration obtained by the combined-driven method of 5 kg TNT and 0.3 MPa compressed gas were 1.669 times, 2.172 times, and 2.308 times more than those obtained by the explosive-driven method of 5 kg TNT, respectively. The maximum overpressure and positive pressure duration obtained by the combined-driven method of 5 kg TNT and 0.3 MPa compressed gas were 2.56 times and 1.162 times more than those obtained by the compression-driven method of 0.3 MPa compressed gas, respectively. Moreover, various shock wave environments could be simulated by controlling the charge mass of explosive charge and the initial pressure of compressed gas.

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