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    Wyświetlanie 1-6 z 6
    Tytuł:
    Numerical study of the projectile trajectory disturbing during the oblique impacts
    Autorzy:
    Morka, A.
    Niezgoda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/244096.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    computational mechanics
    impact problem
    armour perforation
    ballistic resistance
    oblique impact
    Opis:
    The numerical investigations have been performed to determine the effect of the projectile trajectory disturbing during oblique impacts. An impact of the 14.5x118 mm B32 armour piercing projectile on the A12O3 different shape elements backed by 7017 aluminum alloy plate was analyzed. The oblique impact was realized by different shapes of the frontal ceramic elements, including hemispheres and pyramids, with respect to standard flat tiles. The influence of the impact point location was also under considerations. The Computer simulations were performed with the Element Free Galerkin Method (EFG) implemented in LS-DYNA code. full 3D models of the projectile and targets were developed with strain rate and temperature dependent material constitutive relations. The Johson-Cook model was applied to describe the metallic parts, while the ceramic was modelled by Johnson-Holmquist constitutive relations. The models of the projectile, ceramic and aluminium alloy targets were validated with utilization of the experimental datafound in literature. The obtained results confirmed that the projectile trajectory undergoes essential deviation because of the projectile angular velocity. The conditions for maximizing the value of this angular velocity were studied and it is possible to reach several radians per millisecond. The conclusions presented in this paper can be applied to develop modern impact protection panels where the appropriate balance between the mass and protection level must be accomplished.
    Źródło:
    Journal of KONES; 2010, 17, 3; 307-312
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the modelling of penetration/perforation problems
    Autorzy:
    Morka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/246015.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    computational mechanics
    impact problem
    armour perforation
    penetration
    ballistic resistance
    Opis:
    The aim of this paper was to present the main aspects of the numerical modelling within the scope of penetration/perforation problems. The most important stages of the computer model development were discussed in detail. They include the study of the hypervelocity impact physics, selection of the numerical solution method, problem discretization in time (time step) and space (mesh/grid), constitutive models consideration, Initial Boundary Conditions (IBC) and finally choice of the results form for analysis and discussion. The Computer simulations were performed with the Element Free Galerkin Method (EFG) implemented in LS-DYNA code. An impact of the 12. 7x108 mm B32 armour piercing projectile on the selected targets was analyzed. Full SD models of the projectile and targets were developed with strain rate and temperature dependent material constitutive relations. The models of the projectile, ceramic and aluminium alloy targets were validated with utilization of the experimental infield tests and data found in literature. The obtained results confirm that EFG method can be considered for numerical solving of the penetration/perforation problems. The errors in Depth of Penetration have not exceeded 20% as compared numerical and experimental results. The conclusions presented in this paper can be applied to develop modern impact protection panels where the appropriate balance between the mass and protection level must be accomplished.
    Źródło:
    Journal of KONES; 2010, 17, 1; 291-297
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analyses of ceramic/metal ballistic panels subjected to projectile impact
    Autorzy:
    Morka, A.
    Nowak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/242960.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    computational mechanics
    impact problem
    armour perforation
    ballistic resistance
    ceramic armour
    Opis:
    The paper concerns research and development on modern, ceramic-based, protective layers used in the armour of tanks, combat vehicles and aeroplanes. A task of ceramic panels is reduction and dispersion of localized kinetic energy before a projectile or its fragment approaches the interior of protected object. The numerical investigations have been performed to determine the ballistic resistance of ceramic/metal panels subjected to projectile impact. The impact of the 7.62mm armour-piercing projectile on the ceramic elements backed by a metal plate was analyzed. The tested panels were composed of a ceramic layer (Al2O3, SiC or B4C) and a metal layer (7017 aluminium alloy, Armox 500T steel or Ti6Al-4 titanium alloy). Different shapes of ceramic elements were analyzed, including hemispheres and pyramids, with respect to standard flat tiles. The influence of the impact point location was also taken into considerations. The computer simulations were performed with the Finite Element Method implemented in LS-DYNA code. Full 3D models of the projectile and targets were developed with strain rate and temperature dependent material constitutive relations. The conclusions presented in the paper can be applied to develop modern impact protection panels in which the appropriate balance between the mass and protection level must be accomplished.
    Źródło:
    Journal of KONES; 2012, 19, 4; 465-472
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of the shape effect in the ceramic based ballistic panels
    Autorzy:
    Morka, A.
    Jackowska, B.
    Niezgoda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/245901.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    computational mechanics
    impact problem
    armour perforation
    ballistic resistance
    ceramic armour
    Opis:
    The numerical investigations have been performed to determine the front surface shape effect in the cer based armour systems. Different shapes of ceramic elements were analyzed, including hemispheres and pyramids with respect to standard flat tiles. The influence of the impact point location was also under considerations. The Computer simulations were performed with the Element Free Galerkin Method (EFG) implemented in LS-D code. An impact of the 14.5xll8mm B32 armour piercing projectile on the A12O3 different shape elements backe 7017 aluminium alloy plate was analyzed. Full 3D models of the projectile and targets were developed with strain, rate and temperature dependent material constitutive relations. The models of the projectile, ceramic and aluminium alloy targets were validated with utilization of the experimental data found in literature. The obtained results confirm, the preliminary presumptions, that the shape of the front surface can significant role in the overall ballistic resistance of the panel. Particularly projectile-target initial contact area st to be important factor as showed by impact point location analysis. The conclusions presented in this paper can be applied to develop modern impact protection panels where the appropriate balance between the mass and protection level must be accomplished.
    Źródło:
    Journal of KONES; 2009, 16, 4; 539-548
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sediment open water disposal in the aspect of environmental hazard. General trends. Current scientific literature review
    Deponowanie urobku czerpalnego do otwartej toni wodnej w aspekcie zagrożenia dla środowiska. Ogólne trendy. Przegląd aktualnej literatury naukowej
    Autorzy:
    Zegarowski, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/111567.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Morski w Gdańsku
    Tematy:
    dumping site
    sediment dumping
    global problem
    impact of dumping
    pollutions
    general trends
    minimazing the negative impact
    klapowisko
    deponowanie osadów dennych
    globalny problem
    wpływ klapowania
    zanieczyszczenia
    ogólne trendy
    ograniczanie negatywnego oddziaływania
    Opis:
    Disposal into the open water body is the most common practice with dredged sediments from water objects. These actions may disrupt the balance inside and around dumping area. Accumulated in sediments anthropogenic pollution such as heavy metals and persistent organic compounds impact on the environment over a longer period of time. Dumping into aquatic ecosystems million tons of spoils from dredging causes a number of concerns in the international arena. A large number of global treaties and protocols were signed to minimize the negative environmental impact of contaminated sediment from dredging process. According to current scientific papers, the study shows the sources of environmental risks and general trends stemming from this practice. Furthermore, it indicates directions of activities aimed at minimizing the negative impact of human activities resulting from the excavation of waste material brought up from dredging.
    Deponowanie urobku czerpalnego z prac pogłębiarskich do otwartej toni wodnej jest najczęściej praktykowanym rozwiązaniem . Takie działania mogą zakłócić równowagę w środowiska wewnątrz oraz wokół obszaru klapowiska. Nagromadzone w osadach dennych zanieczyszczenia mające charakter antropogeniczny , takie jak metale ciężkie i trwałe związki organiczne, mogą oddziaływać na środowisko w dłuższej perspektywie czasu. Klapowanie milionów ton rocznie osadów, z pogłębiania obiektów wodnych, wywołuje liczne obawy na arenie międzynarodowej. Aby zminimalizować negatywne oddziaływanie urobku deponowanego na klapowiskach podpisano wiele traktatów oraz protokołów o wymiarze globalnym. W oparciu o aktualną literaturę naukową przedstawiono potencjalne zagrożenia oraz trendy wynikające z procesu klapowania osadów dennych z prac pogłębiarskich. Ponadto, wskazano kierunki działań mających na celu ograniczenie negatywnego wpływu działalności człowieka wynikających z klapowania do akwenów morskich.
    Źródło:
    Biuletyn Instytutu Morskiego w Gdańsku; 2015, 30, 1; 118-125
    1230-7424
    2450-5536
    Pojawia się w:
    Biuletyn Instytutu Morskiego w Gdańsku
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification based on a finite element model of an impact force occurring on a composite structure
    Autorzy:
    El-Bakari, Abdelali
    Khamlichi, Abdellatif
    Hanafi, Issam
    Powiązania:
    https://bibliotekanauki.pl/articles/27312394.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analiza modalna
    siła uderzenia
    struktura złożona
    inverse problem
    modal analysis
    identification
    impact force
    composite structure
    Opis:
    Based on the inverse approach and the finite element method, the quality of a reconstructed signal is discussed in this work. The responses caused by a distributed impact on a portion of a composite structure can be recovered using dynamic analysis. The structure is thought to be complex and made up of two different-sized plates made of two different materials. The robustness of the inversion method was studied, as well as the sensitivity of the numerical method compared to modal truncation and sampling of the frequency response function (FRF). Once the FRF had been identified, regularized deconvolution as per generalized singular value decomposition was used to reconstruct the impact signal characteristics. It was revealed that only one mode is required to reconstruct the impact signal.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2023, 28, 1; 23--36
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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