Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Zasada, J." wg kryterium: Autor

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-10 z 10
    Tytuł:
    Degradation of the gas turbine blade coating and its influence on the microstructure state of the superalloy
    Autorzy:
    Błachnio, J.
    Kułaszka, A.
    Zasada, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/244112.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    turbine
    blade
    heat-resistant coating
    technical condition
    Opis:
    The technical condition of the blades has a critical influence on the reliability and life span of a gas turbine and an engine into which it is built in. The main causes of blade damage are overheating, creeping, thermal fatigue, high temperature corrosion, etc. It is often caused by adverse operational conditions or manufacturing defect, e.g. using insufficiently durable types of heat-resistant protective coatings or applied in an improper manner on the blade material. Reaction of coatings and blade material to mechanical and thermal loads depends mainly on the operating temperature of the turbine. Selection of a protective coating and material to manufacture a blade with an assumed strength must take into account its mechanical and thermal properties at maximum aerofoil temperature. The article presents characteristic forms of operational damages to the gas turbine blades of a turbojet aero engine. Distinguished were operational factors and their influence on the technical condition of coatings during the engine operation period. An influence of excess exhaust gas temperature on the condition of the heat-resistant blade layer was shown. Shown were also results of morphology tests of coating degradation types. Results of micro-structure tests of the blade superalloy after damage to the heat-resistant coating were also presented.
    Źródło:
    Journal of KONES; 2015, 22, 2; 17-24
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Analysis of Fatigue Crack Propagation in the Elements of Aluminum Alloy D16CZATW with a Notch in the Formof A Cylindrical Hole
    Autorzy:
    Hutsaylyuk, V.
    Mierzyński, J.
    Zasada, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/97793.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Opis:
    In this work, the fatigue life of specimens made from the aluminum alloy D16CzATW has been determined. To this aim, flat specimens with notches in the form of cylindrical holes made by drilling and reaming have been investigated. The research was carried out under the conditions of constant-amplitude bending at the stress ratio of R = -1. The results obtained were compared with the fatigue life of specimens with calibrated holes and specimens without notches. Fatigue life was determined for specimens plated on both sides and those without this protecting layer. Very large differences in fatigue resistance were observed. These differences can be explained by the negative effect of the brittle protecting layer on the fatigue crack initiation process. A complex fracture mechanism was observed, in which micro-mechanisms of brittle and ductile fracture were appearing at different stages of fatigue crack propagation.
    Źródło:
    Fatigue of Aircraft Structures; 2011, 3; 28-41
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-Site Correlations in a Surface Layer Adsorbed on the Crystal
    Autorzy:
    Wojtczak, L.
    Zasada, I.
    Le Bossé, J. C.
    Lopez, J.
    Rousseau, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891742.pdf
    Data publikacji:
    1991-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.-p
    Opis:
    The incohorent scattering of electrons by layer adsorbed at a single crystal surface is determined by the Fourier transform of correlation functions of elements forming this layer. The model of the description of atoms or molecules adsorbed on the surface is formulated by the occupation operators which are represented by the pseudospin operators. The calculations of the correlation functions are performed by means of methods which consider a given pair of elements embedded in the effective field of remaining elements of the system while the interaction between the elements of the pair are taken in its exact form. Two approaches are presented here, i.e. the cumulant average and constant coupling approximations, and the case of binary chemisorption is considered in detail. The problem of the correlation symmetry is also discussed.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 5; 631-648
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The assessment of changes in the microstructure of a gas turbine blade with a non - destructive thermographic method
    Autorzy:
    Kułaszka, A.
    Błachnio, J.
    Zasada, D.
    Jóźwik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/246861.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    gas turbine
    blade
    pulsed thermography diagnosing
    health/maintenance status
    Opis:
    Diagnostic methods applied nowadays to examine condition of a gas turbine blade have been discussed in the Introduction section. What follows in the body of the paper is presentation of findings on the assessment of changes in the microstructure of a gas turbine blade with a non-destructive thermographic method. A laboratory experiment performed on new turbine rotor blades made of the EI 867WD alloy has been described. The experiment consisted in holding the blades at different temperatures in the exhaust-gas environment produced by an aircraft engine supplied with jet fuel. The pulsed thermography method has been used to determine and analyse the temperature distribution upon the examined area while cooling-down after the earlier uniform warming it up with a heat pulse. Diffusion and effusion of heat in the alloy have been examined. Both phenomena are determined with thermal properties and other physical properties such as size, shape, weight, structure, chemical composition, thickness of the protective coating of the blade. Examination of the microstructure of the blade material has shown the increased thickness of the coating, grain size, and in particular disadvantageous modification in the strengthening gamma' phase against temperature. Finding the relationship between parameters of thermal responses of blade materials to heat pulse against the average size of precipitates of the gamma' phase and thickness of the aluminium protective coating enables inferences on changes in the blade material's condition. With this relationship as the basis and knowing permissible changes to the microstructure one can determine the 'fit-for-use' and 'unfit-for-use' (i.e. serviceable and unserviceable) conditions of the blades. Assuming the material criterion, i.e. some disadvantageous change in the morphology of precipitates of the gamma' phase in the EI 867WD alloy under examination, the 'fit-for-use' (serviceability) thresholds for blades affected with different temperatures have been defined.
    Źródło:
    Journal of KONES; 2012, 19, 2; 271-281
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo Simulation of Partially Ordered Atomic Layers Adsorbed on the Monocristalline Surfaces
    Autorzy:
    Wiatrowski, G.
    Le Bossé, J. C.
    Lopez, J.
    Rousseau, J.
    Zasada, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929295.pdf
    Data publikacji:
    1993-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.-p
    Opis:
    The calculations of the correlations functions and structure factors are performed by means of the Monte Carlo simulation. The results for O/Ni(001) system are presented and compared with those obtained using self-consistent molecular field approximation and cumulant expansion method. The simulation for more complex system CO/Pt(111) is also performed. The calculations of the topological correlations allow us to find the coverage dependence of the incoherent scattering amplitude which can be experimentally detected.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 5; 587-596
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Particles, phases, fields
    Autorzy:
    Wojtczak, L.
    Urbaniak-Kucharczyk, A.
    Zasada, I.
    Rutkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1358839.pdf
    Data publikacji:
    1996
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Opis:
    The physical properties of particles and phasesare considered in connection with their description by means of the deformation of space-time. The analogy between particle trajectories and phase boundaries is discussed. The geometry and its curvature is related to the Clifford algebraic structure whose construction in terms of the theory of deformation leads to the expected solutions for correlation functions referring to spectroscopy and scattering problems. The stochastic nature of space-time is reflected by fluctuations of distances and time intervals.
    Źródło:
    Banach Center Publications; 1996, 37, 1; 351-360
    0137-6934
    Pojawia się w:
    Banach Center Publications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ZL-130TCII Fracture Markers Solution for Full-Scale Fatigue Test
    Autorzy:
    Kłysz, S.
    Lisiecki, J.
    Zasada, D.
    Gmurczyk, G.
    Leski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/97988.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    full scale fatigue test
    fracture surface marking
    quantitative fractography
    Opis:
    In the context of PZL-130TC-II full-scale fatigue test, several strategies of fatigue loadings that create fracture surface markings were considered. One block of spectrum is made of 200 flights. By reordering those flights, a block which should create a fracture marker, was developed. It was very important that reordering the load spectrum or adding overloads or underloads did not change spectrum severity. Pilot tests of aluminium alloys specimens were carried out to finalise appropriate marker intervals before commencing full-scale tests. The experiment was conducted with the MTS machine with 810.23 system. The results and conclusions are presented within this paper.
    Źródło:
    Fatigue of Aircraft Structures; 2011, 3; 22-27
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increasing role of arthropod bites in tularaemia transmission in Poland - case reports and diagnostic methods
    Autorzy:
    Forminska, K.
    Zasada, A.A.
    Zasada, W.
    Rastawicki, W.
    Smietanska, K.
    Bander, D.
    Wawrzynowicz-Syczewska, M.
    Yanushevych, M.
    Niscigorska-Olsen, J.
    Wawszczak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/49868.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2015, 22, 3
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meta-stable conditions of diffusion brazing
    Metastabilne warunki spajania dyfuzyjnego
    Autorzy:
    Wołczyński, W.
    Okane, T.
    Senderowski, C.
    Kania, B.
    Zasada, D.
    Janczak-Rusch, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/351055.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    równowaga meta-stabilna
    rozpuszczanie
    krzepnięcie
    meta-stable equilibrium
    joint formation model
    dissolution
    solidification
    Opis:
    A thermodynamic justification for the joint formation is developed on the basis of the diffusion brazing of the Ni/Al/Ni system. The phenomena of dissolution and solidification were included into the description. The first solid/solid transformation is also discussed. Mainly, a description for the isothermal brazing occurrence in the meta-stable conditions is developed. It involves the application of the criterion of higher temperature of the solid / liquid (s/l) interface. The dissolution of the filler metal in the substrate is described by the N0 - solute concentration within the dissolution zone (liquid film) distinguished at the substrate surface. The selection of the N0 - parameter by the dissolution is justified by the Thermocalc calculation of the Ni-Al phase diagram for meta-stable equilibrium. According to the model assumptions, the solidification is accompanied by partitioning or by undercooled peritectic reaction resulting in formation of the intermetallic phase. The average Al - solute concentration measured across some Al3Ni2/Al3Ni/Al3Ni2 joints confirms that the N0 - solute concentration is conserved within the analyzed joint sub-layers. The Ni-Al phase diagram for meta-stable equilibrium referred to the solidification is also calculated by means of the Thermocalc Software. It allows locating the solidification path, s/l interface path and redistribution path onto the mentioned diagram. Superposition of both calculated phase diagrams is also given to show that the joint formation occurs cyclically under the meta-stable conditions.
    Zaproponowano termodynamiczne uzasadnienie dla kształtowania się złącza na przykładzie spajania dyfuzyjnego systemu Ni/Al/Ni. Do proponowanego opisu włączono zjawiska rozpuszczania i krystalizacji. Pierwsza przemiana w stanie stałym również poddana jest dyskusji. Głównie, opis dotyczy przebiegu spajania dyfuzyjnego w warunkach metastabilnych. Wymaga on zastosowania kryterium wyższej temperatury frontu krystalizacji. Rozpuszczanie składnika łączącego (Al) w podłożu (Ni) jest opisane stężeniem N0 w strefie rozpuszczania (w ciekłej błonce wyróżnionej tuż przy powierzchni podłoża). Selekcja parametru N0 jest uzasadniona obliczeniami z użyciem program Thermocalc Software Programem tym wyznaczono diagram fazowy Ni-Al dla równowagi metastabilnej odniesiony do zjawiska rozpuszczania. Zgodnie z założeniami proponowanego opisu krystalizacji towarzyszą rozdział składnika lub przechłodzona reakcja perytektyczna skutkujące formowaniem się fazy międzymetalicznej. Średnie stężenie Al zmierzone w złączach Al3Ni2/Al3Ni/Al3Ni2 potwierdza, że stężenie N0 jest zachowane w podwarstwach analizowanych złącz. Również, wyznaczono diagram fazowy Ni-Al dla równowagi metastabilnej odniesiony do krystalizacji. Wykorzystano ponownie program Thermocalc Software. Pozwoliło to na zlokalizowanie ścieżki krystalizacji, ścieżki frontów krystalizacji, ścieżki redystrybucji na diagramie fazowym równowagi metastabilnej. Superpozycja obydwu obliczonych diagramów jest także pokazana celem zilustrowania, iż formowanie się złącza zachodzi cyklicznie w obserwowanych warunkach metastabilnych.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 2; 311-323
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Introduction of Fatigue Markers in Full Scale Fatigue Test of an Aircraft Structure
    Autorzy:
    Leski, A.
    Kłysz, S.
    Lisiecki, J.
    Gmurczyk, G.
    Reymer, P.
    Bochenek, D.
    Zasada, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/97777.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    full scale fatigue test
    fatigue markers
    load block rearrangement
    Opis:
    Air Force Institute of Technology participates in the service life assessment programme SEWST. The aim of this programme, funded by the Polish Ministry of Defense, is to modify the operation system of PZL-130 "Orlik" TC-II turbo propelled trainer aircraft. The structural part of the programme is focused on the Full Scale Fatigue Test of the whole airframe to be conducted at the VZLU in the Czech Republic. The load spectrum for the test was developed by the AFIT based on the flight test results. The basic load block represents 200 simulated flight hours and consists of 194 flights showing different levels of severity. At the end of the Full Scale Fatigue Test a teardown inspection is planned during which it would be most beneficial to be able to determine crack propagation rate by means of a crack surface inspection. Markers are usually visible on most fatigue crack surfaces, however they occur randomly therefore it is almost impossible to conclude anything about the crack history. Since the preliminary load block consisted of separate flights (flight loads together with landing and taxing loads) showing significantly different levels of severity, the easiest way to modify the load block was to change the order of flights within the block. Hence a pilot programme was started at the AFIT which was focused on the determination of the influence of flight sequence on crack appearance. Several load blocks were determined using various techniques of rearranging the order of flights within the preliminary load spectrum. This approach ensured the preservation of the initial severity of the load block and simultaneously enabled a significant increase in the probability of the markers occurrence introducing neither artificial underloads nor overloads that would most probably affect the crack propagation rate. Fatigue crack surfaces were inspected using Scanning Electron Microscope. As a result of the investigations a series of images were obtained showing the specimen microstructure with visible markers arranged in the desired sequences. Based on the obtained pictures the most promising load block arrangements were chosen for the Full Scale Fatigue Test.
    Źródło:
    Fatigue of Aircraft Structures; 2012, 4; 29-37
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies