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    Wyświetlanie 1-5 z 5
    Tytuł:
    Selected aspects of numerical analysis of layered flexible structures subjected to impact of soft core projectile
    Szczególne aspekty numerycznej analizy uderzenia pocisków z miękkim rdzeniem w warstwowe struktury wiotkie
    Autorzy:
    Morka, A.
    Kędzierski, P.
    Gieleta, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/139501.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    terminal ballistics
    penetration
    perforation
    FEM
    finite element method
    adaptive method
    ballistic composites
    balistyka końcowa
    penetracja
    perforacja
    MES
    metoda elementów skończonych
    metoda adaptacyjna
    kompozyty balistyczne
    Opis:
    The aim of the study is to identify the relevant aspects of numerical analysis of impact of projectiles with soft cores into a package composed of thin flexible plies located on the plastic backing. In order to illustrate the problem, normal impact of 7.62 mm TT projectile into an unclamped package comprising 36 plies of Dyneema SB71 supported on the plastic backing was selected. The problem was solved with the use of the finite element method (FEM) with the explicit integration scheme (central difference method) of motion equations in the matrix form. Based on the conducted numerical computations, it was revealed that obtaining the extreme deformations of a projectile soft core and the backing material in Lagrangian description requires employment of adaptive methods. The proposed R-adaptive method performs its role but must be used carefully due to the mass loss which may appear during calculations.
    Przedmiotem pracy jest wskazanie istotnych aspektów numerycznej analizy zagadnienia uderzenia pocisków z miękkim rdzeniem w pakiet cienkich wiotkich warstw ulokowanych na plastycznym położu. W celu ilustracji problemu wybrano normalne uderzenie pocisku 7,6225 mm TT w pakiet 36 warstw Dyneema SB71 swobodnie oparty na podłożu plastycznym. Problem rozwiązano z wykorzystaniem metody elementów skończonych (MES) z jawnym schematem (różnic centralnych) całkowania równania ruchu w formie macierzowej MES. Na podstawie przeprowadzonych analiz wykazano, że uzyskanie ekstremalnych deformacji miękkiego rdzenia pocisku oraz plastycznego podłoża w analizie numerycznej w ujęciu Lagrange’a wymaga zastosowania technik adaptacyjnych. Zaproponowana technika R-adaptive spełnia swoją rolę, ale musi być stosowana z rozwagą ze względu na negatywną cechę powodującą utratę masy modelu.
    Źródło:
    Archive of Mechanical Engineering; 2015, LXII, 1; 73-83
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pyramidal ceramic armor ability to defeat projectile threat by changing its trajectory
    Autorzy:
    Stanislawek, S.
    Morka, A.
    Niezgoda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/202070.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    computational mechanics
    ballistic protection
    composite armor
    ceramics
    mechanika obliczeniowa
    ochrona balistyczna
    kompozytowy pancerz
    ceramika
    Opis:
    This paper presents a numerical study of a multilayer composite panel impacted by an AP (Armor Piercing) 14.5×114 mm B32 projectile. The composite consists of alternating layers of hard ceramic and a ductile aluminum alloy. While the alloy layer consists of typical plate, ceramics confront projectiles in the form of ceramic pyramids. The studied models are compared with a reference structure, which is a standard double layer panel. The problem has been solved with the usage of modeling and simulation methods as well as a finite elements method implemented in LS-DYNA software. Space discretization for each option was built with three dimensional elements ensuring satisfying accuracy of the calculations. For material behavior simulation, specific models including the influence of the strain rate and temperature changes were considered. A steel projectile and aluminum plate material were described by the Johnson-Cook model and a ceramic target by the Johnson-Holmquist model. The obtained results indicate that examined structures can be utilized as a lightweight ballistic armor in certain conditions. However, panels consisting of sets of ceramic prisms are a little easier to penetrate. Despite this fact, a ceramic layer is much less susceptible to overall destruction, making it more applicable for the armor usage. What is most important in this study is that significant projectile trajectory deviation is detected, depending on the impact point. Such an effect may be utilized in solutions, where a target is situated relatively far from an armor.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 843-849
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of two-component armour
    Autorzy:
    Kędzierski, P.
    Morka, A.
    Sławiński, G.
    Niezgoda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/200962.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimization
    composites
    numerical simulations
    ballistic protection
    optymalizacja
    kompozyty
    symulacje numeryczne
    ochrona balistyczna
    Opis:
    The paper presents research on optimization of two-layer armour subjected to the normal impact of the 7.62x54 B32 armour piercing (AP) projectile. There were analysed two cases in which alumina Al2O3 was supported by aluminium alloy AA2024-T3 or armour steel Armox 500T. The thicknesses of layers were determined to minimize the panel areal density whilst satisfying the constraint, which was the maximum projectile velocity after panel perforation. The problem was solved through the utilization of LS-DYNA, LS-OPT and HyperMorph engineering software. The axisymmetric model was applied to the calculation in order to provide sufficient discretization. The response of the aluminium alloy, armour steel and projectile material was described with the Johnson-Cook model, while the one of the alumina with the Johnson-Holmquist model. The study resulted in the development of a panel optimization methodology, which allows the layer thicknesses of the panel with minimum areal density to be determined. The optimization process demonstrated that the areal density of the lightest panel is 71.07 and 71.82 kg/m2 for Al2O3-Armox 500T and Al2O3-AA2024-T3, respectively. The results of optimization process were confirmed during the experimental investigation.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 173--179
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and experimental study of armour system consisted of ceramic and ceramic- elastomer composites
    Autorzy:
    Chabera, P.
    Boczkowska, A.
    Morka, A.
    Niezgoda, T.
    Oziębło, A.
    Witek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200348.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ballistic performance
    numerical simulation
    ceramic
    wydajność balistyczna
    symulacja numeryczna
    ceramiczny
    Opis:
    The paper presents numerical and experimental results in the study of composite armour systems for ballistic protection. The modelling of protective structures and simulation methods of experiment as well as the finite elements method were implemented in LS DYNA software. Three armour systems with different thickness of layers were analyzed. Discretization for each option was built with three dimensional elements guaranteeing satisfactory accuracy of the calculations. Two selected armour configurations have been ballistically tested using the armour piercing (AP) 7.62 mm calibre. The composite armour systems were made of Al2O3 ceramics placed on the strike face and high strength steel as a backing material. In case of one ballistic structure system an intermediate ceramic- elastomer layer was applied. Ceramic- elastomer composites were obtained from porous ceramics with porosity gradient using pressure infiltration of porous ceramics by elastomer. The urea-urethane elastomer, as a reactive liquid was introduced into pores. As a result composites, in which two phases were interconnecting three-dimensionally and topologically throughout the microstructure, were obtained. Upon ballistic impact, kinetic energy was dissipated by ceramic body The residual energy was absorbed by intermediate composite layer. Effect of the composite shell application on crack propagation of ceramic body was observed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 853-859
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of numerical and experimental study of armour system based on alumina and silicon carbide ceramics
    Autorzy:
    Chabera, P.
    Boczkowska, A.
    Morka, A.
    Kędzierski, P.
    Niezgoda, T.
    Oziębło, A.
    Witek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202054.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ballistic performance
    numerical simulation
    armour
    alumina ceramic
    silicon carbide ceramic
    ceramic-elastomer composites
    wydajność balistyczna
    symulacja numeryczna
    zbroja
    kompozyt ceramika-elastomer
    Opis:
    The main goal of this numerical and experimental study of composite armour systems was to investigate their ballistic behaviour. Numerical simulations were employed to determine the initial dimensions of panel layers before the actual ballistic test. In order to achieve this aim, multivariate computations with different thicknesses of panel layers were conducted. Numerical calculations were performed with the finite element method in the LS-DYNA software, which is a commonly used tool for solving problems associated with shock wave propagation, blasts and impacts. An axisymmetric model was built in order to ensure sufficient discretization. Results of a simulation study allowed thicknesses of layers ensuring assumed level of protection to be determined. According to the simulation results two armour configurations with different ceramics have been fabricated. The composite armour systems consisted of the front layer made of Al2O3 or SiC ceramic and high strength steel as the backing material. The ballistic performance of the proposed protective structures were tested with the use of 7.62 mm Armour Piercing (AP) projectile. A comparison of impact resistance of two defence systems with different ceramic has been carried out. Application of silicon carbide ceramic improved ballistic performance, as evidenced by smaller deformations of the second layer. In addition, one of armour systems was complemented with an intermediate ceramic-elastomer layer. A ceramic-elastomer component was obtained using pressure infiltration of gradient porous ceramic by elastomer. Upon ballistic impact, the ceramic body dissipated kinetic energy of the projectile. The residual energy was absorbed by the intermediate composite layer. It was found, that application of composite plates as a support of a ceramic body provided a decrease of the bullet penetration depth.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 363-367
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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