Temat: Fatigue - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A fatigue damage accumulation method in low - cycle fatigue zone
Autorzy:: Mroziński, S.
Powiązania:: https://bibliotekanauki.pl/articles/279495.pdf
Data publikacji:: 2000
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: fatigue life
fatigue damage accumulation
low-cycle fatigue
Opis:: A summation method of the fatigue damage in a low cycle fatigue zone is proposed in the paper. The method is based on a fatigue curve revolution, with the fatigue in the... co-ordinate system as a base line. The low-cycle properties and parameters of a loading program are necessary for fatigue life calculations. Experimental verification of the proposed hypothesis(one material, two types of loading: random and programed) showed a satisfactory agreement between the test and calculation results. A comparative analisys between the calculation results obtained using the linear damage rule (LDR) and those resulting from the method proposed, showed several advantages of the latter one. These are; e.g., the fact that the results obtained are located in the safe fatigue life area, simplicity of the method and sensitivity to the parameters of a loading program.
Hipoteza kumulacji uszkodzeń zmęczeniowych w obszarze niskicyklowego zmęczenia. W pracy przedstawiono propozycję metody sumowania uszkodzeń zmęczeniowych w obszarze niskocyklowego zmęczenia. Opisywana metoda jest oparta na koncepcji obrotu wykresu zmęczeniowego. Wykresem bazowym jest wykres trwałości zmęczeniowej w układzie współrzędnych ... . Niezbędne dane do obliczeń trwałości to własności niskocyklowe oraz parametry programu obciążenia. Weryfikacja doświadczalna proponowanej hipotezy (jeden materiał, dwa rodzaje obciążenia - losowe i programowane) wykazała zadowalającą zgodność wyników obliczeń i badań. Przeprowadzona analiza porównawcza wyników obliczeń uzyskanych przy wykorzystaniu hipotezy liniowej (LDR) oraz hipotezy przedstawionej w poniższej pracy wykazała szereg zalet tej ostatniej. Do zalet metody obliczeń zaliczono m. in. położenie uzyskanych wyników obliczeń w bezpiecznym obszarze trwałości, jej prostotę, oraz wrażliwość na parametry programu obciążenia.
Źródło:: Journal of Theoretical and Applied Mechanics; 2000, 38, 4; 767-780
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Integral fatigue criteria evaluation for life estimation under uniaxial combined proportional and non-proportional loadings
Ocena zmęczeniowych kryteriów całkowych w zakresie szacowania trwałości w warunkach obciążeń jednoosiowych, złożonych proporcjonalnych i nieproporcjonalnych
Autorzy:: Skibicki, D.
Pejkowski, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/281733.pdf
Data publikacji:: 2012
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: multiaxial fatigue
fatigue life
fatigue criteria
integral approach
Opis:: The paper presents a review and verification of integral fatigue criteria. The review signals the key assumptions and criteria structure elements. The verification has been developed drawing on the experimental data reported in literature containing fatigue life for uniaxial, combined proportional and non-proportional loads. The verification involves a comparison of computational fatigue life with the experimental one. To determine the quality of the results generated, statistical parameters were used. As a result of the analysis the best and the worst criteria were pointed to.
Celem niniejszej pracy jest ocena możliwości szacowania trwałości zmęczeniowej za pomocą całkowych kryteriów zmęczeniowych. Podejście całkowe bazuje na założeniu, że dla prawidłowej oceny zachowań zmęczeniowych konieczne jest zsumowanie (scałkowanie) wartości parametru zniszczenia na wszystkich płaszczyznach przechodzących przez rozpatrywany punkt materiału. Analizę przeprowadzono dla trzech najczęściej spotykanych kryteriów całkowych: kryterium Zennera i dwóch kryteriów Papadopoulosa. Uzyskane wyniki porównano z kryterium zmęczeniowym McDiarmida, bazującym na konkurencyjnym w stosunku do całkowego podejściu płaszczyzny krytycznej, oraz powszechnie stosowanym w wielu obszarach wytrzymałości materiałów kryterium Hubera-Misesa-Hencky’ego.
Źródło:: Journal of Theoretical and Applied Mechanics; 2012, 50, 4; 1073-1086
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Aluminum and its alloys in the very high cycle fatigue regime
Autorzy:: Okechukwu, P. Nwachukwu
Gridasov, Alexander V.
Talskikh, Kristina Y.
Grishin, Anton V.
Nikiforov, Pavel A.
Sukhorada, Aleksey E.
Powiązania:: https://bibliotekanauki.pl/articles/1178317.pdf
Data publikacji:: 2017
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Aluminum alloys
Crack initiation
Fatigue failure
Fatigue limit
Gigacycle fatigue
Opis:: This paper examines the very high cycle fatigue of aluminum alloys used in engineering applications. Specifically taken into consideration are findings of tests and experiments by some scientists and experts in the field of fatigue of structural materials. The examination of the most common material defects that initiate cracks and causes of fatigue failures in aluminum alloys in the very high cycle regime are reviewed. As aluminum alloys are among the most commonly used structural materials that do not exhibit a fatigue limit at 107 load cycles, it became very important to critically review the tests and experiments of experts in the field in order to ascertain the most causes of failures in these alloys. This paper concluded by suggesting the directions for future works in the very high cycle fatigue of aluminum alloys based on the theoretical review.
Źródło:: World Scientific News; 2017, 81, 2; 121-131
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Application of two-parameter fatigue charactersitics in fatigue persistence calculations of structural components under conditions of a broad spectrum of loads
Autorzy:: Szala, G.
Powiązania:: https://bibliotekanauki.pl/articles/260285.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: fatigue persistence
linear hypothesis of fatigue damage summation
fatigue tests
Opis:: The paper presents an original method of calculation of the fatigue persistence based on the adoption of the load spectrum in the form of a correlation table, two-parameter fatigue characteristics and the linear hypothesis of fatigue damage summation. The calculation results by the proposed method were compared with the results of fatigue tests programmed for node-seal construction. On the basis of a comparative analysis of the test results and calculations conclusions regarding the usefulness of the proposed method to evaluate the fatigue persistence of components have been reached.
Źródło:: Polish Maritime Research; 2016, 4; 138-145
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A probabilistic method of determining fatigue life of a structural component using the paris formuła and the probability density function of time of exceeding the boundary condition - an outline
Autorzy:: Tomaszek, H.
Klimaszewski, S.
Zieja, M.
Powiązania:: https://bibliotekanauki.pl/articles/245569.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: fatigue life
density function
fatigue cracking
Opis:: An attempt has been made to present a probabilistic method to determine fatigue life of an aeronautical structure's component by means of a density function of time a growing crack needs to reach the boundary condition. It has been assumed that in a component of a structure given consideration there is a small crack that grows due to fatigue load affecting it. After having reached the boundary value the component in question loses its usability. Time of the crack growth up to the boundary value is termed a fatigue life of the component. From the aspect of physics, the propagation of a crack within the component, if approached in a deterministic way, is described with the Paris 's relationship for m = 2. To model the fatigue crack growth a difference equation has been applied, from which the Fokker-Planck equation has been derived to be then followed with a density Junction of the growing crack. The in this way found density function of the crack length has been applied to find density Junction of time of reaching the boundary condition. This function has been used in the present paper to determine the randomly approached fatigue life of a component of a structure. The present paper has been prepared for the case there is coefficient m = 2 in the Paris formula. With the in the paper presented scheme, one can find fatigue life of the structure's component for the case m not equal to 2.
Źródło:: Journal of KONES; 2009, 16, 3; 431-438
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The Influence of The Degree of the Rivet Hole Sizing on the Fatigue Life
Autorzy:: Lipski, A.
Powiązania:: https://bibliotekanauki.pl/articles/97917.pdf
Data publikacji:: 2012
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:: fatigue tests
rivets
holes
fatigue life
Opis:: The paper presents the results of fatigue tests of specimens with sized rivet holes. Samples for tests were made of 0.05'' (1.27 mm) thick non-clad plates of aluminium grade 2024-T3. Rivet holes were prepared assuming that they shall be used for 3 mm nominal diameter snap head rivets for aviation-related purposes. Different sizing degrees were achieved by drilling holes of different diameters in the samples followed by the sizing process using a sizing mandrel of the same diameter of 3.15 mm. Holes in the test samples were drilled using special device ensuring appropriate quality and repeatability of the holes. Five different sizing degrees were achieved be means of five drills of different diameters. Samples with holes of varying degrees of sizing were tested under constant amplitude sinusoidal loading conditions (cycle asymmetry coefficient R = 0) at the load frequency of 5 Hz. The study was conducted at three levels of maximum stress in the cycle. Fatigue life test results were presented in the form of fatigue diagrams (regression lines) determined in the bi-logarithmic coordinate system log N, log S_max. The results of the fatigue life tests received for the drilled as well as drilled and reamed holes were also presentedfor comparison. The results obtained lead to the conclusion that that the lowest fatigue life characterises samples with drilled holes and drilled and reamed holes. Fatigue life of specimens with holes for rivets improved (by 50% to 74%, depending on load level), even as a result of the hole surface polishing only (minimum sizing degree), whilst the two-fold growth of fatigue life was achieved for holes of a slight sizing degree. A further significant increase in fatigue life was achieved by the cold work of the hole's surface. Based on the location of the fatigue diagrams and the fatigue life tests results, it may be concluded that the higher a sizing degree, the higher the fatigue life growth. The growth is also proportional to the specimen load level: the lower the load level, the higher the fatigue life growth. Fatigue diagrams obtained from tests were divided into three groups: diagrams for drilled holes and drilled and reamed holes, diagrams for holes with a low degree of sizing and diagrams for holes with a high degree of sizing. This division was confirmed by statistical tests of regression lines parallelism by the “peer-to-peer” method.
Źródło:: Fatigue of Aircraft Structures; 2012, 4; 64-69
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Fatigue life of metallic material estimated according to selected models and load conditions
Autorzy:: Kluger, K.
Łagoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/281337.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: uniaxial fatigue
multiaxial fatigue
mean stress
Opis:: The authors present results of a fatigue test for specimens made of the aluminium Allom 2017A-T4 and alloy steels S355J2WP and S355J2G3 subjected to constant-amplitude proportional combined bending with torsion including mean stress values and for the S355J2WP alloy steel under uniaxial constant-amplitude and random loading with both zero and non zero mean stress values. The test results were compared with the results of calculations according to the models proposed by Goodman, Gerber and Morrow as well as the stressstrain parameter. In the case of calculations based on the stresses, the multiaxial stress state was reduced to a uniaxial one using the Huber-Mises relationship. As for the method based on strain energy density, the multiaxial stress state was reduced to the uniaxial one with use of the stress-strain parameter. The plane in which the stress-strain parameter of shear loadings reaches its maximum value is assumed to be the critical plane.
Źródło:: Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 581-592
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Assessment of the fatigue life of machine components under service loading – a review of selected problems
Autorzy:: Będkowski, W.
Powiązania:: https://bibliotekanauki.pl/articles/279894.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: fatigue life prediction
multiaxial fatigue
service loading
Opis:: Based on a literature review, the author provides a historical outline of the fatigue analysis and describes the current trends aiming at comprehension of the fatigue life of engineering structures under service loading. Next, an algorithm for multiaxial fatigue life prediction is identified, describing steps of calculation. Classification criteria of fatigue failure and components of the stress state in multiaxial loading conditions are also presented, recognising the importance of the so-called Standarised Load Histories (SLH) used in the comparative analysis of fatigue life of finished products.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 2; 443-458
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Wysokocyklowe badania zmęczeniowe z wykorzystaniem minipróbek
High cycle fatigue tests using mini specimen
Autorzy:: Tomaszewski, T.
Sempruch, J.
Piątkowski, T.
Powiązania:: https://bibliotekanauki.pl/articles/315934.pdf
Data publikacji:: 2013
Wydawca:: Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:: trwałość zmęczeniowa
badania zmęczeniowe
fatigue life
fatigue tests
Opis:: Praca dotyczy oceny trwałości zmęczeniowej, traktowanej jako cecha niezawodności. Specyficznym obszarem zainteresowań autorów jest sytuacja, kiedy niemożliwe jest pobranie materiału do badań w ilości odpowiadającej próbkom normatywnym. Zaprezentowano metodykę badań z wykorzystaniem próbek o zmniejszonych wymiarach (tzw. minipróbek). W pracy wyznaczono efekt skali dla stopu aluminium EN AW-6063. Uzyskane wyniki pozwoliły określić zależność wytrzymałości na rozciąganie i wytrzymałości zmęczeniowej dla dwóch geometrii próbek. Otrzymano zbieżności wartości współczynnika wrażliwości materiału na zmianę rozmiaru przekroju wyznaczonego z prób monotonicznych i zmęczeniowych.
The paper concerns the assessment of the fatigue life, which is treated as a feature of reliability. A specific area of interest for the authors is situation, where taking test material is impossible in a quantity corresponding a normative specimens. The methodology of the tests using specimens with reduced dimensions (called mini specimen) were presented. The paper attempts to determine the size effect for the EN AW-6063 aluminum alloy. The results have made it possible to define the relationship of the ultimate tensile strength and fatigue strength for two geometry of the specimens. The values of the coefficient of material sensitivity to change in the cross-section for monotonic and fatigue tests are similar.
Źródło:: Autobusy : technika, eksploatacja, systemy transportowe; 2013, 14, 3; 875-882
1509-5878
2450-7725
Pojawia się w:: Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Some problems of slide bearing material fatigue evaluation
Autorzy:: Sikora, J.
Kłopocki, J.
Majewski, W.
Kurzych, K.
Powiązania:: https://bibliotekanauki.pl/articles/242756.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: bearings
tribology
bearing testing
fatigue investigations
fatigue performance
Opis:: A slide bearing alloy resistance against fatigue failures have been investigated for three different lubricants, different heat loadings and different stress ratio K values. The research methods and data handling procedures for determination of particular parameter effects on fatigue strength have been described and analysed for experiments that were set and performed in laboratory tester SKMR-2. Main and interaction effects of lubricant and stress ratio factors on bearing material fatigue strength have been analysed. Design scheme of the SKMR-2 head unit, Standard tested half-bearing, fatigue failures on the surface of the specimen, cross-section through the damaged surface layer of the specimen, fatigue limit stress amplitude vs. temperature and kind of oil, main effect of stress ratio, main effects of temperature and oil are illustrated in the paper. Main conclusions are cover in statements that fatigue strength of the bearing material is affected, to the highest degree, by the mechanical stress value and stress ratio and resistance to the fatigue cracks is being reduced for higher tensional stress, increase in temperature is resulting in decreasing of the fatigue strength rating values, fatigue strength of the slide layer is considerably dependent on the type of the used lubricant interactions of the type of the lubricants, their temperatures, loading stress ratio have been noticed.
Źródło:: Journal of KONES; 2007, 14, 4; 427-432
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Comparing guidelines concerning construction of the S-N curve within limited fatigue life range
Autorzy:: Strzelecki, P.
Sempruch, J.
Nowicki, K.
Powiązania:: https://bibliotekanauki.pl/articles/260399.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: high-cycle fatigue
S-N curve
fatigue tests
Opis:: The article collates guidelines concerning experimental construction of the S-N fatigue curves within a limited fatigue life range. An attempt is made to compare these guidelines, based on experimental data recorded during rotating bending of a notched specimen made of 42CrMo4. The recorded differences in fatigue life values between the constructed curves reach the maximum of 12.2%. According to the above guidelines, the number of tests in particular test series varies from 6 to 28. Based on the performed analysis a conclusion was made that the increase in the number of tests leads to the increase of accuracy but, on the other hand, remarkably increases the time of the experiment and, consequently, its cost. In this context, it is the research worker who, taking into account a possible future use of the fatigue curve, should individually decide about its accuracy.
Źródło:: Polish Maritime Research; 2015, 3; 67-74
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Low-Cycle Fatigue Characteristics of Selected Titanium, Magnesium and Aluminium Alloys
Autorzy:: Junak, G.
Powiązania:: https://bibliotekanauki.pl/articles/351829.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: fatigue life
low-cycle fatigue
light metal alloys
Opis:: In the paper, on the basis of the performed tests, low-cycle fatigue characteristics (LCF) of selected light metal alloys used among others in the automotive and aviation industries were developed. The material for the research consisted of hot-worked rods made of magnesium alloy EN-MAMgAl3Zn1, two-phase titanium alloy Ti6Al4V and aluminium alloy AlCu4MgSi(A). Alloys used in components of means of transport should have satisfactory fatigue, including low-cycle fatigue, characteristics. Low-cycle fatigue tests were performed on an MTS-810 machine at room temperature. Low-cycle fatigue tests were performed for three total strain ranges Δε_t = 0.8%, 1.0% and 1.2% with a cycle asymmetry coefficient R = –1. On the basis of the obtained results, characteristics of the fatigue life of materials, cyclic deformation σ_a = f(N) and cyclic deformation of the tested alloys were developed. The tests showed that titanium alloy Ti6Al4V was characterised by the highest fatigue life N_f , whereas the lowest fatigue life was found in the tests of the aluminium alloy AlCu4MgSi(A).
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 4; 1949-1955
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: On the Estimation of Fatigue Crack Initiation Life of H62 Brass
Autorzy:: Zheng, M.
Zhang, S.
Peng, Xiao Jian
Wang, Yi
Powiązania:: https://bibliotekanauki.pl/articles/2048866.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: strain energy density
fatigue damage strain
theoretical strain fatigue limit
fatigue crack initiation
life prediction
Opis:: In the present paper, the excavation of the energetic approach that estimates the fatigue crack initiation life of metal is conducted for H62 brass. The benefit of the energetic approach is the division of the actual applied strain range Δε into two parts, that is, a damage strain range Δεd that induces fatigue damage within the metal, and an undamaged strain range Δεc, which does not produce fatigue damage of the metal and corresponds to theoretical strain fatigue limit. The brightness of this approach is that the undamaged strain range Δεc can be estimated by the fundamental conventional parameters of metal in tensile test. The result indicated that the fatigue crack initiation life of H62 brass can be estimated by this approach successfully.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 1; 31-35
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Fatigue life of compacted wire ropes for applications in deep mining
Autorzy:: Kubiś, Bogusław
Olszyna, Grzegorz
Szade, Piotr
Tytko, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/27315587.pdf
Data publikacji:: 2023
Wydawca:: STE GROUP
Tematy:: steel wire rope
fatigue tests
compacted ropes
fatigue durability
Opis:: Recent months have highlighted the progressing energy crisis across Europe in connection with the severe sanctions imposed on the import of hydrocarbons and coal from Russia. This is particularly visible in Poland, where over 40% of electricity is generated from coal, while in individual households it is the primary source of heat. This situation puts the already enigmatic plans of shutting down coal mining in Poland into question. Therefore, work aimed at increasing the extraction capacity of existing shafts while maintaining the highest level of operational safety is still valid. This article concerns the issues of the fatigue life of compacted ropes used as hoist ropes in mine shafts. The discussion regarding the use of these ropes among shaft hoist users has been going on for several years. This paper presents the unique results of compacted rope fatigue tests carried out at the Central Mining Institute in Katowice. In the authors’ view, these results and their interpretation should serve to clarify several important aspects that arouse the interest of users.
Źródło:: Management Systems in Production Engineering; 2023, 1 (31); 95--101
2299-0461
Pojawia się w:: Management Systems in Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Analysis of axle shaft fatigue failure and anti-fatigue system design
Autorzy:: İrsel, G.
Powiązania:: https://bibliotekanauki.pl/articles/102537.pdf
Data publikacji:: 2017
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: CATIA
ANSYS
fatigue analysis
redesign
shaft fatigue
product development
Opis:: In this study, an axle shaft subjected to static deformation and fatigue damage was considered by using computer-aided engineering. This shaft system was modeled with CATIA and subjected to dynamic fatigue analyses with Ansys workbench. The damaged fracture surfaces of the shaft have been examined. Thus, the fatigue and damage was revealed in greater detail. For the present system, a design with a minimum cost, short production process, minimum weight was sought together with methodical construction principles. By means of CATIA and ANSYS, the product development design with reasonable tension and deformation values was formed for endless life fatigue. A design was produced in a short space of time with the help of 2D CATIA drawings and field tests were carried out. The design was used through 560.000 cycles and damage was not observed.
Źródło:: Advances in Science and Technology. Research Journal; 2017, 11, 3; 150-163
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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