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    Wyświetlanie 1-8 z 8
    Tytuł:
    Influence of Add-On Perforated Plates on the Protective Performance of Light-Weight Armour Systems
    Autorzy:
    Fras, T.
    Faderl, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/403600.pdf
    Data publikacji:
    2018
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    mechanics
    perforated add-on armour
    armour-piercing (AP) projectile
    Opis:
    The presented experimental investigation, aimed at verification of defeat mechanisms against small-calibre projectiles, provided by 4-mm-thick perforated plates with different material- and geometrical properties, was performed. A regular pattern of punched holes in steel plates increases the possibility of asymmetrical contact between the plate and projectiles which may cause threat destabilization, rotation or fragmentation depending on the impact position. Three tested armour configurations comprise the super-bainitic high-hardness Pavise™ SBS 600P armour steel plates perforated by elongated holes of size 4 x 12 mm (the first configuration), the martensitic high-hardness Mars® 300P steel plates perforated by circular holes with a diameter of 5 mm (in the second configuration); and in the third configuration, the martensitic Mars® 300 plates perforated by oblong holes (4 x 10 mm) were used. The performed impact tests proved that the tested add-on plates assured high protection against the impact of 7.62 x 51 .308 Win P80 hard-core armour piercing (AP) projectiles. It was also observed that the plates caused similar mechanisms of bullet failure.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2018, 9, 1 (31); 31-48
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applications of the Burzyński hypothesis of material effort for isotropic solids
    Zastosowania hipotezy wytężenia Burzyńskiego dla ciał izotropowych
    Autorzy:
    Frąś, T.
    Pęcherski, R. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/368856.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    kryterium plastyczności Burzyńskiego
    powierzchnia plastyczności
    efekt różnicy wytrzymałości
    energetyczne kryteria plastyczności
    Burzyński yield condition
    yield surface
    strength differential effect
    energy-based yield criteria
    Opis:
    The paper contains a short presentation of main idea of energy-based hypothesis of material effort proposed by Burzyński with discussion of the resulting failure criteria. Some examples illustrating applications of these criteria are discussed and visualizations of limit surfaces in the space of principal stresses are presented.
    Praca zawiera krótką prezentację głównej idei energetycznej hipotezy wytężenia zaproponowanej przez Burzyńskiego wraz z dyskusją wynikających z niej kryteriów wytrzymałości. Przedstawiono kilka przykładów zastosowań tych kryteriów wraz z wizualizacją granicznych powierzchni w przestrzeni naprężeń głównych.
    Źródło:
    Mechanics and Control; 2010, 29, 2; 45-50
    2083-6759
    2300-7079
    Pojawia się w:
    Mechanics and Control
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rubber and magnetorheological fluid applied as the interlayer in composite armours against high-velocity loadings
    Autorzy:
    Fras, T.
    Fras, L. J.
    Faderl, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/327194.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    energy absorption
    rubber
    magnetorheological fluid
    protective properties
    pochłanianie energii
    guma
    ciecz magnetoreologiczna
    właściwości ochronne
    Opis:
    Monolithic, homogenous ballistic shields consisting of a single thick, high-hardness and high-strength steel plate are rarely applied in modern combat vehicles. Currently, a popular armour concept is a multilayered shield since it is expected that the kinetic energy of a threat may be dissipated by transmission through materials with different properties and also by multiple interface reflections. Searching for a maximum ballistic protection at minimum weight inspires applications of various materials which complementary behaviour provides a high protective efficiency without excessive mass. The preliminary experimental investigation presented in the paper aimed to verify behaviour of two prototyped laminated armours under impacts of small-calibre projectiles (cal. 7.62). The main interest lied in impact properties of materials proposed as the intermediate layer. The first tested concept was a laminated steel armour with the 10 mm thick rubber interlayer. In the second armour, the intermediate layer consisted of a magnetorheological fluid.
    Źródło:
    Diagnostyka; 2017, 18, 3; 63-68
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of two fracture models in impact simulations
    Autorzy:
    Fras, T.
    Roth, C. C.
    Mohr, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/200605.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    armour steel
    Lode angle parameter
    stress triaxiality
    Hosford-Coulomb model
    Johnson-Cook model
    Opis:
    The following discussion concerns modelling of fracture in steel plates during an impact test, in which both target and striker are manufactured from the same material, high-strength high-hardness armour steel – Mars® 300. The test conditions (3 mm thick targets, projectiles with different nose shapes at impact velocity lower than 400 m/s) result in severely damaged components, which results in an analysis of stress states showing material failure. Numerical analyses are performed using two material models: the Johnson-Cook approach, as traditionally used in impact simulations, accounting for the effect of stress triaxiality, strain rate and temperature and for comparison, a simulation by means of the stress triaxiality and Lode angle parameter-dependent Hosford-Coulomb model, also incorporating the effect of the strain rate on a fracture initiation. The aim of the study is to analyse the mechanisms of penetration and perforation observed in the armour steel plates and validation of the modelling approaches.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 317-325
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy-Based Yield Condition for Orthotropic Materials Exhibiting Asymmetry of Elastic Range
    Autorzy:
    Pęcherski, R. B.
    Rusinek, A.
    Fras, T.
    Nowak, M.
    Nowak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/351015.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    energy-based yield condition
    orthotropic solids
    initial anisotropy
    strength differential effect
    numerical simulation
    Opis:
    The aim of the paper is to formulate physically well founded yield condition for initially anisotropic solids revealing the asymmetry of elastic range. The initial anisotropy occurs in material primarily due to thermo-mechanical pre-processing and plastic deformation during the manufacturing processes. Therefore, materials in the “as-received” state become usually anisotropic. After short account of the known limit criteria for anisotropic solids and discussion of mathematical preliminaries the energy-based criterion for orthotropic materials was formulated and confronted with experimental data and numerical predictions of other theories. Finally, possible simplifications are discussed and certain model of isotropic material with yield condition accounting for a correction of shear strength due to initial anisotropy is presented. The experimental verification is provided and the comparison with existing approach based on the transformed-tensor method is discussed.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 771-778
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of the Deployment of Bioenergy by Increasing the Efficiency of Biogas Production
    Autorzy:
    Dettmann, S.
    Kanswohl, N.
    Fras, J.
    Schlegel, M.
    Geick, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/409266.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    bioenergy
    biogas
    biogas digester
    efficiency
    methane production
    Opis:
    The share of renewable energy, which is used for power supply, increases worldwide steadily to avoid the threat of climate change. In the renewable energy production from renewable resources biogas plays an important role. Biogas can be provided continuously by the permanent availability of biomass and it is also easily to store. In the context of competition for land between food and feed production as well as the cultivation of renewables an efficient biogas production is extremely important. Strategies for this aim are installing biogas plants in order to increase the biogas output and take measures to increase the efficiency of existing biogas plants or of concepts of biogas digesters for the new installation.
    Źródło:
    Research in Logistics & Production; 2016, 6, 1; 5-14
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the impact of interior orientation parameters in different UAV-based image-block compositions on positional accuracy
    Autorzy:
    Grigillo, D.
    Uršič, M.
    Bone, M.
    Ambrožič, T.
    Pavlovčič-Prešeren, P.
    Kosmatin-Fras, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220711.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    unmanned aerial vehicle
    calibration field
    interior orientation parameters
    positional accuracy assessment
    Opis:
    Understanding the factors that influence the quality of unmanned aerial vehicle (UAV)-based products is a scientifically ongoing and relevant topic. Our research focused on the impact of the interior orientation parameters (IOPs) on the positional accuracy of points in a calibration field, identified and measured in an orthophoto and a point cloud. We established a calibration field consisting of 20 materialized points and 10 detailed points measured with high accuracy. Surveying missions with a fixed-wing UAV were carried out in three series. Several image blocks that differed in flight direction (along, across), flight altitude (70 m, 120 m), and IOPs (known or unknown values in the image-block adjustment) were composed. The analysis of the various scenarios indicated that fixed IOPs, computed from a good geometric composition, can especially improve vertical accuracy in comparison with self-calibration; an image block composed from two perpendicular flight directions can yield better results than an image block composed from a single flight direction.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 3; 617-629
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Logistical Advantages Due to the Use of an Innovative Sensor Unit for Controlling Optimum Biogas Processes
    Autorzy:
    Schlegel, M.
    Fras, J.
    Geick, T.
    Zosel, J.
    Schelter, M.
    Kritzner, A.
    Orth, M.
    Ibrahim, B.
    Kanswohl, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/409594.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    remote control
    biogas process
    sensor unit
    Opis:
    For imaging of the biogas process fast and long-term stable measurement methods misses for certain parts of the process. Thus, it is necessary to know the development of organic acids. These metabolites, which are generated during the bacterial degradation, are important indicators. The process is generally very confusing, not only in terms of the number of occurring bacteria and chemical compounds, but also their variabilities. For the knowledge of such changes a direct, low-wear and permanent monitoring of organic acids would be extremely useful. Upon the occurrence of a change like hyperacidity we could react quickly. There are already some proven methods. However, these methods have several disadvantages: the information gathering is logistically difficult by long journeys, by process conditions information’s are delayed and distorted, quickly worn sensors, etc. Therefore, a innovative development is presented here, which avoids all the disadvantages listed. The sensor unit has been developed in cooperation with KSI Meinberg, Logic Way Schwerin, IBZ Hohen Luckow, University of Rostock and a polish colleague. According to Raoult law a characteristic is used in principle, which is typical of some liquid and gaseous media that are touching. This means volatile substances, which for example, are also in the fermenter broth, among others organic acids, are also detectable in the gaseous phase. If in the gas phase such acids can be detected, conclusions about the acid content in the substrate broth are possible. In different experiments evaluable matches between the developments of organic acids on the one hand in the liquid phase (broth) and on the other hand, in the gaseous phase were found. These results are based on an acid sensor unit with which distant standing biogas plants can be controlled remotely. A project regarding this topic is supported by research programme ZIM. Project executing organization is AiF (Arbeitsgemeinschaft industrieller Forschungsvereinigungen “Otto von Guericke” e.V.).
    Źródło:
    Research in Logistics & Production; 2016, 6, 5; 407-418
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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