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    Wyświetlanie 1-6 z 6
    Tytuł:
    Ultrahigh-Strength Nanostructured Steels for Armours
    Autorzy:
    Garbarz, B.
    Marcisz, J.
    Adamczyk, M.
    Wiśniewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/403480.pdf
    Data publikacji:
    2011
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    passive armour
    penetration of steel
    maraging steel
    Opis:
    The paper presents principles of designing and examination results of superclean high-strength new generation maraging steel for composite armours protecting against piercing with small-calibre armour-piercing (AP) projectiles. The research concerns maraging steel of yield strength ≥ 2,5 GPa and suitable toughness required to achieve high resistance of armour to piercing with AP projectiles. Three base compositions of maraging steel (MS) of yield strength 400 ksi, 500 ksi and 550 ksi with different content of alloying elements Fe, Ni, Co, Mo, W, V are described. The process of vacuum melting of the concerned steels was presented as well as further processing, i.e. homogenizing treatment, hot working, machining, solution treatment, ageing and grinding in order to prepare plates with dimensions of 50 × 50 × 10 mm. The manner of perpendicular firing at the aforementioned plates placed on a stand with RHA armour "witness" plate is presented. Moreover, demonstrated are also the visible results of maraging plates firing with 12,7 mm B-32 type armour-piercing incendiary projectiles on RHA plates. Also shown are the images of scans performed using an electron microscope of maraging plates' fracture surface generated by firing.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2011, 2, 1 (3); 25-36
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Building and Validation of the Johnson-Cook Constitutive Model of Nano-Composite NANOS-BA® Steel for Armour Applications
    Autorzy:
    Wiśniewski, A.
    Żochowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/403264.pdf
    Data publikacji:
    2014
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    numerical simulations of penetration
    nanosteel
    penetration of steel
    API projectile
    Opis:
    Constitutive modeling of the NANOS-BA® steel is described in this article. Results of the experiments (quasi-static uniaxial tension and uniaxial compression, high strain rate compression with use of the Split Hopkinson Pressure Bar) are shown. On the basis of the experiments results, the values of constants of the Johnson-Cook (J-C) model for the NANOS-BA® steel were determined. Verification of the determined values of constants was described, in which the stresses and strains obtained in samples in experiments and simulations were compared. The additional verification of the determined parameter values was the comparison of the depth of penetration tests (DP tests) results of NANOS-BA® steel plates placed on the Armox 500T „witness” plate fired with a 12.7 mm B-32 projectile, obtained experimentally and in simulations. Small differences between simulation and the experiments results testify that the determined values of constants of J-C model for NANOS-BA® steel provide good agreement with experiments.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2014, 5, 2 (16); 7-18
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical-Experimental Analysis of Applicability of NANOS-BA Steel for Armour
    Autorzy:
    Wiśniewski, A.
    Żochowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/403669.pdf
    Data publikacji:
    2013
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    mechanics
    numerical simulations of penetration
    nanosteel
    penetration of steel
    API projectile
    Opis:
    Described in this paper is the analysis of the applicability of NANOS-BA steel for armour. The results of depth of penetration (DP) tests of the NANOS-BA steel plates placed on the Armox 600T „witness” plate and fired at with the 12.7 mm B-32 type projectile are shown. These results are compared to the Al2O3 ceramic plate penetration with the use of the same method. In both cases the armour was of similar area density (approx. 39 kg/m2). The theoretical analysis of the applicability of the NANOS-BA steel in a layered armour was conducted and numerical simulations of the DP tests were performed. Additional simulations were made for two variants of layered armour penetration: in variant 1 - One of the layers in construction was of the NANOS-BA steel, in variant 2 - One of the layers was of special ceramics. The process of the simulations verification is described, in which the deformations of the „witness” plate obtained experimentally are compared to the results of the simulations. Small differences (< 2 mm) of penetration were obtained in the simulations and experimentally confirmed that the simulations were performed correctly.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2013, 4, 4 (14); 15-26
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Building and Validation of Numerical Models of the B-32 Type Armour-Piercing Projectiles
    Autorzy:
    Wiśniewski, A.
    Żochowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/403885.pdf
    Data publikacji:
    2013
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    mechanics
    terminal ballistics
    numerical simulations of penetration
    penetration of steel
    API projectile
    Opis:
    Process of building and the validation of the numerical models of the B-32 type armour-piercing incendiary (API) projectile is described in this article. Results of projectile compression tests (static and under high strain rates with the use of the modified Split Hopkinson Pressure Bar) are shown. On the basis of this, the values of the Johnson–Cook (J–C) strength model parameters for the projectile core material (N12e steel) were determined. This article presents results gained from simulations of the tests, in which the B-32 type projectile was modelled with the use of determined values of the J–C strength and failure models parameters. The process of the parameters values verification was described, in which the stress and strain obtained from samples in experiments and simulations were compared. Additional verification of the determined parameters values was comparison to the depth of penetration (DP) tests results of the Armox 500T plates fired with the 12.7 mm B-32 type projectile, obtained experimentally and in simulations. Small differences (< 5%) between stress and penetration depths obtained in the simulations and in the tests showed that the J–C parameter values were determined correctly.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2013, 4, 2 (12); 19-30
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Test for penetrability of 10GHMBA steel used for the ballistic safety shields
    Autorzy:
    Załęska-Fornal, A.
    Kyzioł, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/242925.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    ballistics
    ballistic properties of steel
    penetration of the shield
    ballistic thickness of steel
    penetration
    perforation of the shield
    Opis:
    There are elaborated some dependences which make it possible to compute some materials resistant to hits with the energy greater than in so far tests of the bullets of 7,62 mm caliber. The tests of being resistant to hit have been carried out with the 10GHMBA steel which has been overshot by the bullets of 12.7 mm. In order to do that the single cover plates with changeable thickness have been placed in the ballistic pendulum. On the basis of the obtained measurements like speed before and behind the specimen, the pendulum deflection angle, the force passed to the dynamometer sleeve, it is possible to define the maximum thickness of the penetrated material. The comparison with the bullets proof of various materials like steel with composites, ceramics or the mathematical models verification by an experiment can be done with direct comparison of some chosen measured parameters. For example the bullet speed behind the specimen has to be related to its thickness similarly to some other parameters which are possible to be measured. All the quantities like the bullet speed behind the specimen are the functions of the specimen thickness for the defined type of bullet. The penetration process of the material is a kind of transformation of the energy carried by the bullet into the energy of the specimen deformation, the emitted warm or into the pendulum work. In order to compare the bullet proof with various materials or the mathematical models with experiment there is proposed getting in some non-dimensional factors which define the change of the kinetic energy or the system impulse.
    Źródło:
    Journal of KONES; 2012, 19, 4; 659-666
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response surface methodology assisted multi-objectiveoptimization of TIG process for 15CDV6 steel
    Autorzy:
    Skariya, P. D.
    Satheesh, D. M.
    Dhas, J. E.
    Chandrasekar, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839113.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    TIG welding
    15CDV6 HSLA steel
    depth of penetration
    bead width
    HAZ width
    Opis:
    Welding is a way of heating pieces of metal usingelectricity or flame so that they melt and stick together. There aremany kinds of welding processes, such as, for instance, MIG/MAGand MMA welding. However, such welding schemes require moreelectrodes during the process of welding. Hence, this paper intendsto analyse the alternative tungsten inert gas (TIG) welding tech-nology using Response Surface Methodology (RSM), and to identifythe effect of TIG welding process parameters on the weld bead pro-file of 15CDV6 high strength low alloy (HSLA) steel. Moreover, themethodology applied allows for identification of the optimal weld-ing conditions by means of multi-objective optimization using RSMto increase the depth of penetration (DOP) and reduce BW (beadwidth) and heat-affected zone (HAZ) width. The variables takenfor the model-based investigations are: welding current (Wc), torchspeed (Ts), gas flow rate (Gr), torch angle (Ta) and arc gap (Ag).Moreover, the responses taken are DOP, BW and HAZ width. Fur-ther, the results from the proposed model optimisation can be seenas highly beneficial for the rocket-motor hardware program, indus-tries and fabrication of pressure vessels, which are using 15CDV6steel.
    Źródło:
    Control and Cybernetics; 2018, 47, 4; 465-496
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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