The Early Responses of Air-backed plate subjected to underwater explosion with aluminized explosives

Liu, Jian; An, Feng-jiang; Wan, Cheng; Liao, Shasha; Zhou, Mingxue; Xue, Dongyu

doi:10.1016/j.dt.2019.11.003

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…Most research on non-ideal explosives has focused on explosive formulation [14][15][16], detonation product composition [17,18], detonation power [19,20], kinetic modeling [21], the heat of detonation calculations [22,23], and energy output patterns [24,25]. There are some relevant research on the effect of casings on non-ideal detonations [26][27][28][29], however, this effect varies depending on the case material, the case mass [30], the charge type [31], and the shape of warheads.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation on the bomb case effects of non‐ideal aluminized explosive

Li,

Deng

2024

Propellants Explo Pyrotec

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The detonation process of non‐ideal explosives is influenced by the casing of the bomb. Non‐ideal charges in the process of the explosion of live ammunition energy output mechanism and distribution ratio, the impact of the case on the explosion flow field, and other issues cannot be obtained through the existing theoretical analysis and testing techniques to obtain specific values. This paper establishes a “detonation+afterburning” energy output model to characterize the energy release characteristics of non‐ideal charges, using step‐by‐step numerical simulation of the near and middle, and far fields of the explosion, and verify simulation results through experiments, quantitative analysis the case of a type of earth penetrator on the normal particle size (4 μm) and two times the normal particle size (8 μm) of non‐ideal charges of aluminum powder explosion process. The results indicate that the presence of the casing enhances the energy output of aluminum powder with 4 μm by ≈5 %. When the particle size of aluminum powder is doubled, the maximum reaction rate and the peak of the shock wave are merely around 35 % and 75 %, respectively, compared to those of normal particle size. The detonation products, case fragments, and air constitute 49 %, 48 %, and 3 % of the overall explosion energy, respectively. The proportional equation of the conversion between the chemical energy of the explosion and the kinetic energy of the case fragments is obtained. These conclusions can provide data support for the design of non‐ideal charge warheads, lethality assessment, and establishment of engineering protection standards.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation on the bomb case effects of non‐ideal aluminized explosive

Li,

Deng

2024

Propellants Explo Pyrotec

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“…And research fields related to this field are not less, including kinetic energy penetrating entity against thin panel, water entry of projectiles and explosives detonated by shock waves underwater, or sort of that. Liu et al [1] did experiments on air-back plates in water against underwater explosion, they also researched on plates in water against explosion shock waves numerically and experimentally [2], Zhang et al [3] studied air-back plates in water against multiplied underwater explosions numerically. Zhang et al [4] explored penetration of Q235 steel plates with high speed projectiles in numerical methods and in experiment.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on Projectile Penetration into Underwater Torpedo Warhead

Ding,

Chen,

et al. 2023

J. Phys.: Conf. Ser.

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Underwater torpedo interception could be conducted by shell perforation or even warhead impact detonation with high speed projectiles. This work deals with the projectile water entry and sequent penetration into underwater torpedo whereby both aluminium shell perforation and explosive detonation are numerically studied. The water entry model and aluminum impact model are validated against test data for underwater aluminum shell penetration. Targets are located under water with 20 cm depth where aluminium shells for penetration are air-back while the impact detonation model has explosives inside shell. Four kinds of different nose shape tungsten projectiles are used for penetration simulation, revealing that ogival nose projectiles have superior performance for both shell perforation as well as detonation than conical nose projectiles. Numerical predictions shed some light on nose shape optimization design of high velocity projectile against torpedoes.

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“…A nonideal explosive releases its energy more slowly over a longer period of time due to the different energy release mechanisms [10]. Aluminized explosives are commonly used for UNDEX applications as the aluminium powder can significantly increase the bubble energy [11,12,13].…”

Section: Introductionmentioning

confidence: 99%

A Modelling Approach for the Analysis of Underwater Explosive Performance Trials

Milne

Burn

Carr

et al. 2021

Propellants Explo Pyrotec

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We present here a coupled experimental and numerical modelling study to compare the underwater performance of different explosive charge types in simple geometries with a view to having confidence in the use of these models in the design of more complex warheads. Numerical modelling is used to predict the shock and bubble performance of underwater detonated charges and is intended to be used for comparison of the performance of different charge compositions. Model predictions are compared to experimental data from the underwater deto-nation of 1 kg cylindrical charges. It is shown that a simple 1D spherical geometry Eulerian hydrocode solution is suitable for comparison of the performance of different charge types provided that gauges are located on the radial axis of the charge and located a sufficient distance from the charge. Predictions using our chosen explosive models are shown to accurately capture the shock and bubble performance of ideal and non-ideal charges tested and the effects of charge casing so that these models can be used in more complex warhead design studies at a later date.

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The Early Responses of Air-backed plate subjected to underwater explosion with aluminized explosives

Cited by 8 publications

References 21 publications

Numerical simulation on the bomb case effects of non‐ideal aluminized explosive

Numerical simulation on the bomb case effects of non‐ideal aluminized explosive

A Numerical Study on Projectile Penetration into Underwater Torpedo Warhead

A Modelling Approach for the Analysis of Underwater Explosive Performance Trials

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