The efficiency of a small sized hand-made shaped charge

Bohanek, Vječislav; Dobrilović, Mario; Tumara, Barbara Štimac; Stanković, Siniša

doi:10.17794/rgn.2022.2.7

Cited by 3 publications

(10 citation statements)

References 7 publications

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“…The consequences of the non‐ideal behaviour of ANFO are manifested in the strong dependence of the detonation parameters on the charge diameter [3, 6, 7], existence and characteristics of the confinement [8–13], in a curved shock front [2, 7, 14–16], the existence of a fraction of unreacted ANFO at the sonic point [2, 3, 14], and a large failure diameter [6, 16]. The effects of the confinement characteristic on the detonation properties of ANFO are studied by several researchers [8–11, 17, 18]. Some of them studied this effect experimentally [8, 11, 17], while others employed numerical simulation [12, 18–23].…”

Section: Introductionmentioning

confidence: 99%

“…The effects of the confinement characteristic on the detonation properties of ANFO are studied by several researchers [8–11, 17, 18]. Some of them studied this effect experimentally [8, 11, 17], while others employed numerical simulation [12, 18–23]. In general, it can be stated that systematic research on the effect of confinement is sparse and that the interaction between explosive and confinement is still not well understood.…”

Section: Introductionmentioning

confidence: 99%

“…One of the issues that arouses special interest is the influence of the sound speed in the confiner on the detonation parameters [10, 12, 18, 24, 25]. Experiments of Eden and Belcher [24] showed that the local detonation velocity can be increased by a few percents in the vicinity of the confiner‐explosive interface if the sound speed in the confiner exceeds the detonation velocity.…”

Section: Introductionmentioning

confidence: 99%

“…Bohanek et al. [18] proposed a similar equation applicable to cylindrical thin‐wall ANFO charges. The weakness of the above‐mentioned confinement models is that they are not applicable a very thin confinement and zero‐thickness confinement (e. g., Bohanek's et al.…”

Section: Introductionmentioning

confidence: 99%

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An empirical confinement model for ANFO explosive

Suceska,

Bohanek,

Dobrilovic

et al. 2024

Propellants Explo Pyrotec

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Ammonium‐nitrate‐fuel‐oil (ANFO) explosive, one of the most used mining explosives, exhibits highly non‐ideal behaviour. The non‐ideality of the detonation is manifested in the strong dependence of the detonation velocity on the charge radius and existence and the characteristics of confinement. This can lead to the detonation velocities as low as one‐third of the ideal velocity. The literature reported experimental detonation velocities of cylindrical ANFO charges confined in different confiners (aluminium, copper, steel, polymethyl methacrylate, and polyvinyl chloride) are analysed in this paper. An empirical confinement model, which relates the detonation velocity to the charge radius and the mass of the confiner to the mass of explosive ratio per unit length, is proposed. The model predicts the detonation velocity of unconfined and confined ANFO charges with a mean average percentage error of 8.8 %.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An empirical confinement model for ANFO explosive

Suceska,

Bohanek,

Dobrilovic

et al. 2024

Propellants Explo Pyrotec

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“…Shaped charge jet warheads comprise an explosive with a concave shape to focus detonation energy (Kleiser and Lambert, 2015), a metal liner adhered to the explosive, steel or aluminum casing around the explosive and a detonator which initiates the explosive (Molinari, 2002; Naeem and Hussain, 2018). Explosive length, wave shaper, liner geometry, liner material, liner thickness, liner angle and standoff distance are the fundamental parameters that influence the penetration performance which is identified as the depth of the penetration of the jet in to the target (Ayısıt and Çoruh, 2013; Bohanek et al , 2014). For years, researchers have investigated the effect of liner material and microstructure of the liner and the explosives in the shaped charge warhead and initiation systems to increase the penetration performance (Majiet and Mostert, 2019).…”

Section: Introductionmentioning

confidence: 99%

Effect of fragment impact on shaped charge jet formation and penetration into steel target

Hafizoglu

Konokman

Kesemen

et al. 2022

WJE

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Purpose This paper aims to investigate the effects of fragment impacts to shaped charge warheads in terms of shaped charge jet formation geometries and penetration performances. Design/methodology/approach In experimental process, a fragment was accelerated to a shaped charge warhead by means of a powder gun to a velocity more than 1,000 m/s, and this impact led to conical damage in the explosive of the warhead. Deformation on the warhead was visualized using X-ray technique to observe holes generated during fragment impact. Penetration test was performed against AISI 1040 steel plates with the damaged shaped charge warhead. Penetration performance of shaped charge jet, which deviated from the symmetry axis, was simulated by using SPEED software with 3-D Eulerian method to validate the numerical modelling method by comparing penetration test and simulation results of damaged warhead. Findings Simulation and test results showed good correlation for the warhead in terms of penetration depth and hole geometry at the impact surface of steel plates. In addition, the effects of the numbers and the geometries of fragment holes on shaped charge jet penetration performances were investigated with validated numerical methods. Simulation results showed that the increase in the number of fragment holes in the explosive of the warhead led to particulation of shaped charge jet that diminished penetration depth in the target plate. Additionally, simulation results also showed that the fragment hole geometry in the explosive after different fragment impact angles affected the amount of jet deviation from the symmetry axis as well as penetration depth in the target plate. Practical implications The results obtained from the current study revealed that fragment impact angle and different number of fragment impact reduced the penetration performance of shaped charge warhead by influencing the symmetry of shaped charge jet negatively. Originality/value The current study fulfils the need to investigate how fragment impact on the shaped charge warhead affect the formation symmetry of shaped charge jet as well as penetration performance by experimental and numerical methods. Penetration performance result of asymmetric jet is compared by experimental and numerical studies. A detailed methodology on numerically modelling of the effect of fragment impact angle and number of fragment impact on shaped charge jet performance is given in this study.

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Study on the Penetration Performance of a Double-Angle Linear Shaped Charge: Performance Improvement and Miniaturization

Park,

Kwon

2024

Aerospace

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This study was conducted on a linear shaped charge with a double-angle liner. The double-angle liner has a large inner apex angle and a small outer liner angle. Experiments and numerical analysis were performed in a penetration performance study, and it was confirmed that the experimental results and numerical analysis results matched well. As a result of the numerical analysis, at the standoff distance of 1.5 CD, the penetration performance of the double-angle linear shaped charge was improved by 14.5% compared to the conventional linear shaped charge, and at the standoff distance of 2.5 CD, the penetration performance was improved by 12.5%. For miniaturization, numerical analysis was performed by reducing the height of the explosive and the standoff distance. As a result of the numerical analysis, the penetration performance of the double-angle linear shaped charge was improved by 14.6% compared to the conventional linear shaped charge. Double-angle liners are effective in improving the penetration performance of linear shaped charges.

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The efficiency of a small sized hand-made shaped charge

Cited by 3 publications

References 7 publications

An empirical confinement model for ANFO explosive

An empirical confinement model for ANFO explosive

Effect of fragment impact on shaped charge jet formation and penetration into steel target

Study on the Penetration Performance of a Double-Angle Linear Shaped Charge: Performance Improvement and Miniaturization

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