Numerical simulation of underwater subway tunnel subjected to internal blast loading

2019 ◽  
pp. 767-772
Author(s):  
J. Mandal ◽  
M.D. Goel ◽  
A.K. Agarwal
Keyword(s):  
Numerical Simulation ◽  
Blast Loading ◽  
Subway Tunnel ◽  
Internal Blast Loading

Investigation on the Loading Characteristics in Proof Units

2018 ◽  
Author(s):  
Liucheng Zhang ◽  
Qi Dong ◽  
Sha Yang
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Flow Field ◽  
Blast Loading ◽  
Current Paper ◽  
Diffraction Wave ◽  
Internal Blast Loading ◽  
Adjacent Unit ◽  
Positive Effect

Blast-proof units are used in explosive production applications to isolate the adjacent unit from damaging shockwave effects in the event of an accidental explosion. The damage is mainly caused by the transmission wave through the wall and the diffraction wave over the upper edge. Investigation on the blast flow field in blast-proof units subjected to internal blast loading is studied by numerical simulation in the current paper. The influence of the height of the proof unit is analyzed and on the cap situation is studied. The result shows that increasing the height of blast-proof units may not have a positive effect on reducing the diffraction wave, because it may enhance the reflection wave, which might have a greater effect than the diffraction wave. We can reduce the shock wave in the next unit by adding a cap, which is very effective. The study may contribute to further understanding on the experiment results and the design of blast-proof units.

Investigation on the Loading Characteristics in Proof Units

2017 ◽  
Author(s):  
Liucheng Zhang ◽  
Qi Dong ◽  
Sha Yang
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Flow Field ◽  
Blast Loading ◽  
The Other ◽  
Current Paper ◽  
Diffraction Wave ◽  
Internal Blast Loading ◽  
Positive Effect

Blast-proof unit is designed to alleviate the shock wave transmitting to the other unit, in which the damage of accidental explosion is mainly caused by the transmission wave through the wall and diffraction wave over the upper edge. Investigation on the blast flow field in blast-proof units subjected to internal blast loading is studied by numerical simulation in the current paper. The influence of the height of the proof unit is analyzed and on the cap situation is studied. The result shows that it may not have a positive effect on reducing the diffraction wave by increasing the height of units, because it may enhance the reflection wave, which might have a greater effect than the diffraction wave. We can reduce the shock wave in the next unit by adding a cap, which is very effective. The study may contribute to further understanding on the experiment results and the design of blast-proof units.

scholarly journals Numerical Simulations of V-Shaped Plates Subjected to Blast Loadings: A Validation Study

2016 ◽  
Vol 10 (11) ◽  
pp. 203
Author(s):  
Mohd Zaid Othman ◽  
Qasim H. Shah ◽  
Muhammad Akram Muhammad Khan ◽  
Tan Kean Sheng ◽  
M. A. Yahaya ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Variable Mass ◽  
Blast Loading ◽  
Experimental Results ◽  
Average Difference ◽  
Simulation Results ◽  
Blast Loadings ◽  
Carrier Vehicle ◽  
Good Agreement

A series of numerical simulations utilizing LS-DYNA was performed to determine the mid-point deformations of V-shaped plates due to blast loading. The numerical simulation results were then compared with experimental results from published literature. The V-shaped plate is made of DOMEX 700 and is used underneath an armour personal carrier vehicle as an anti-tank mine to mitigate the effects of explosion from landmines in a battlefield. The performed numerical simulations of blast loading of V-shaped plates consisted of various angles i.e. 60°, 90°, 120°, 150° and 180°; variable mass of explosives located at the central mid-point of the V-shaped vertex with various stand-off distances. It could be seen that the numerical simulations produced good agreement with the experimental results where the average difference was about 26.6%.

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