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    Wyświetlanie 1-7 z 7
    Tytuł:
    Application of BCHMX in Shaped Charges against RHA Targets Compared to Different Nitramine Explosives
    Autorzy:
    Elbeih, A.
    Elshenawy, T.
    Zeman, S.
    Akstein, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/358768.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    BCHMX
    shaped charge
    jet penetration
    nitramines
    Opis:
    In this work, a new bicyclic nitramine, cis-1,3,4,6-tetranitro-octahydroimidazo-[4,5-d]imidazole (bicyclo-HMX or BCHMX), has been tested for its performance as a shaped charge explosive filler in comparison with three other interesting cyclic nitramines. Four shaped charges were prepared using different nitramine-based plastic bonded explosives (PBXs), and their performance was measured experimentally in terms of the penetration depth into laminated rolled homogeneous armour (RHA) targets. The explosive fillers were highly pressed PBXs based on RDX, HMX, BCHMX and CL-20, bonded by Viton A binder. The Autodyn numerical hydrocode was implemented to determine the shaped charge jet’s characteristics and its penetration depth. The experimental and calculated detonation characteristics of the explosives used are reported. Relationships between the detonation characteristics of the explosives and the jet characteristics were observed. The results show that CL-20 is the most powerful explosive, with the largest penetration depth into the RHA target, while BCHMX explosive has a relatively enhanced penetration depth with respect to RDX explosive. The results of the Autodyn code calculations are consistent with the experimental measurements, with a maximum difference of 6.6%.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 1; 3-17
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Study of the Effectiveness of a Model Reactive Armour without Metal Plates
    Autorzy:
    Trzciński, Waldemar A.
    Zalewski, Karol
    Chyłek, Zbigniew
    Szymańczyk, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/27788236.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    reactive armour
    metalized explosives
    jet penetration
    Opis:
    Explosive reactive armour (ERA) is widely used to protect military vehicles against shaped charges and kinetic projectiles, but the use of the ERA element with metal plates is potentially hazardous to the surroundings. A patent claim has recently been issued on explosive reactive armour without metal plates. The non-metallic ERA consists of an explosive, a heavy metal powder and a binder. The aim of the present work was to experimentally test the effectiveness of such armour for disrupting cumulative jets. HMX was used as the explosive matrix and RTV silicone as the binder. Tungsten (W) powder was added to the explosive. The disruption of the cumulative jet was assessed on the basis of X-ray images, the number and size of holes in a steel plate, which was placed under the shaped charge, and the penetration depth of a steel target. It was shown that reactive armour consisting of HMX and W powder was effective in dispersing the cumulative jet, especially for a small impact angle (30°). The influence of the W particle size and the content of the W powder in the armour on jet were investigated. Finally, the effectiveness of one of the tested reactive armours was compared with that of classic reactive armour with steel plates.
    Źródło:
    Central European Journal of Energetic Materials; 2022, 19, 2; 113--134
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Liner Wall Thickness on the Penetration Performance of PETN-HTPB PBX-based Shaped Charges into Steel Targets
    Autorzy:
    Elshenawy, Tamer
    Ezzat, Eldesoky
    Riad, Ahmed M.
    Elkader, Mohamed Abd
    Powiązania:
    https://bibliotekanauki.pl/articles/27788060.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    shaped charges
    Autodyn jetting
    steel target
    liner thickness
    jet penetration
    Opis:
    The thickness of a shaped charge liner is one of the essential parameters that must be considered when optimizing penetration depth into a target material. In this paper, experimental and analytical studies have been implemented using shaped charges having copper liner thicknesses ranging from 0.7 to 1.3 mm in an optimization study of the influence of jet characteristics on the achieved penetration depths into steel targets. The shaped charges were filled with equal masses of PETN-polyurethane based PBX explosive charges and fired against steel targets placed at 29 mm stand-off distance. The experimental measurements show that the depth of jet penetration into steel targets increased with liner thickness up to a thickness of 1.1 mm, after which the penetration decreased again. A numerical study was also carried out using the hydrocode Autodyn to model the jets used in the optimization analysis, which accounted for the variation of penetration depth using different liner thicknesses. This analysis also showed why the penetration depth achieved with a liner thickness of 1.0 mm was not optimum due to its non-coherent formed jet. Instead, a liner with a wall thickness of 1.1 mm exhibited the optimum penetration depth of 12.8 cm.
    Źródło:
    Central European Journal of Energetic Materials; 2022, 19, 1; 63--90
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Modified Penetration Model for Copper-Tungsten Shaped Charge Jets with Non-uniform Density Distribution
    Autorzy:
    Elshenawy, T.
    Elbeih, A.
    Li, Q. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358894.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    shaped charge
    jet penetration
    virtual origin
    non-uniform density distribution
    Opis:
    The penetration of a shaped charge jet with non-uniform density distribution was studied. The virtual origin model, which assumes a constant jet density, was modified to include the situation where the jet density deficit/reduction of an un-sintered copper-tungsten powder jet causes a non-uniform jet density distribution. A relation between the relative density ratio and the normalised jet velocity is proposed, based on which an analytical solution of the modified virtual origin model is obtained. The validity of the modified virtual origin model was demonstrated by its largely improved prediction in comparison with experimental and numerical results. It showed that the density reduction term reduces the penetration depth by 16.58% for an un-sintered copper-tungsten powder jet.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 4; 927-943
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Penetration Performance of Powder Metallurgy Copper-Tungsten Shaped Charge Liners
    Autorzy:
    Elshenawy, T.
    Abdo, G.
    Elbeih, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/358754.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    penetration
    copper-tungsten liner
    RDX
    jet formation
    Autodyn
    Opis:
    Copper tungsten liner manufactured using uniaxial pressing technique has been characterized numerically and experimentally in comparison with a baseline shaped charge copper liner produced by deep drawing technique. The jet properties resulted from these two shaped charges were different according to their liner types and relevant densities which affect the resultant penetration depths into rolled homogeneous armour (RHA) targets. Different copper-tungsten powder liners have been studied and analysed using Autodyn hydrocode, from which an optimum powder design was chosen based on its maximum jet kinetic energy that can be coherent. The compacted liner elastic properties have been measured using SONELASTIC apparatus, whereas its real density is determined using helium gas pycnometer. Baseline copper liner obtained by deep drawing technique of uniform density exhibited lower penetration depth in comparison with the copper-tungsten liner (higher density powder). Besides, the penetration crater resulted from the powder liner showed clean hole without clogging because there was no massive slug as in the case of the copper liners. Experimental field tests of the two liners against (RHA) targets exhibited different penetrations depths, which have been accounted in this research.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 4; 610-628
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hemispherical Zirconium Liner for Advanced Shaped Charge with Enhanced Behind Armour Effect
    Autorzy:
    Elshenawy, Tamer Abd Elazim
    Elbasuney, Sherif
    Powiązania:
    https://bibliotekanauki.pl/articles/27787986.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    hollow charge
    penetration
    copper liner
    zirconium liner
    jet temperature
    Opis:
    Armour penetration is an essential outcome for shaped charges, especially when the behind-armour effect is considered. Hemispherical liners produce superior jet mass compared with those of traditional conical shape. In this paper two different materials have been studied as hemispherical shaped charge liners. The reference liner was hemispherical oxygen-free high-conductivity copper (OFHC); the other liner material was zirconium. These liners were experimentally tested against 4340 steel targets in shaped charges loaded with the same amount of Composition B explosive. Zirconium liners were found to offer superior performance with experimental penetration and crater diameter respectively 16% and 20% greater than OFHC. Ansys Autodyn hydrocode simulation results demonstrated that both liners produced superior jet masses exceeding 50% of the total liner mass. Moreover, zirconium had a jet tip velocity of 4869 m/s compared with 3886 m/s for OFHC. Additionally, zirconium had a superior average jet collapse to plastic deformation temperature ratio of 0.73 compared with 0.34 for OFHC. This is the first time the relation between the jet temperature during collapse and jet stretching has been reported.
    Źródło:
    Central European Journal of Energetic Materials; 2021, 18, 3; 293--321
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Modelling of Shaped Charges in the Last Two Decades (1990-2010): A Review
    Autorzy:
    Shekhar, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/358365.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    copper liner
    high explosives
    jet formation
    shaped charges
    target penetration
    Opis:
    Shaped charges are used for the penetration of targets in all three dimensions of warfare - land, air and naval. With fillings of high explosives compositions inside, they generate a thin high velocity metal jet, which can perforate the targets. Shaped charges can penetrate tanks with thick armour protection, they can destroy bunkers, they can destroy aircraft and are also useful for attacking ships or submarines. Although shaped charges have a very long history since the Second World War, theoretical modelling efforts started with the steady state theory of Birkhoff in 1948. This theory was modified by the non-steady state theory known as the PER theory of shaped charges. Later, several contributions from experimental evidence were incorporated in the theoretical formulations, and the mathematical models were refined by including the virtual origin, and physical qualities of the jet breakup time, defragmentation into particulates time, the diameter of the metal jet, wave amplitude etc. To review the development of theoretical modelling of shaped charges, three stages are defined. The first is the development until 1990, when the theory of shaped charges was fully developed and penetration predictions with fairly good accuracy were possible. The second stage reviews work carried out in the last decade of the 20th century. During this period good experiments were planned, parametric study was carried out and the results incorporated in the mathematical model of shaped charges. The third stage is all work done in the 21st century (2000-2010), when the tools for advanced diagnostics, new fabrication and inspection, as well as new liner materials were incorporated. The anomalies obtained were resolved by further refinements in the developed theoretical models. The unexplored areas of the theoretical modelling of shaped charges are also enumerated in this paper.
    Źródło:
    Central European Journal of Energetic Materials; 2012, 9, 2; 155-185
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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