Temat: fatigue - Prolib Integro

Skocz do pozycji: 1.

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.
Tematy:: multiaxial fatigue
fatigue life
fatigue criteria
integral approach; Pokaż więcej
Data publikacji:: 2012
Powiązania:: https://bibliotekanauki.pl/articles/281733.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Theoretical and Applied Mechanics; 2012, 50, 4; 1073-1086
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A fatigue damage accumulation method in low - cycle fatigue zone
Autorzy:: Mroziński, S.
Tematy:: fatigue life
fatigue damage accumulation
low-cycle fatigue; Pokaż więcej
Data publikacji:: 2000
Powiązania:: https://bibliotekanauki.pl/articles/279495.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Theoretical and Applied Mechanics; 2000, 38, 4; 767-780
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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.
Tematy:: fatigue persistence
linear hypothesis of fatigue damage summation
fatigue tests; Pokaż więcej
Data publikacji:: 2016
Powiązania:: https://bibliotekanauki.pl/articles/260285.pdf Link otwiera się w nowym oknie
Źródło:: Polish Maritime Research; 2016, 4; 138-145
1233-2585
Pojawia się w:: Polish Maritime Research
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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.
Tematy:: Aluminum alloys
Crack initiation
Fatigue failure
Fatigue limit
Gigacycle fatigue; Pokaż więcej
Data publikacji:: 2017
Powiązania:: https://bibliotekanauki.pl/articles/1178317.pdf Link otwiera się w nowym oknie
Źródło:: World Scientific News; 2017, 81, 2; 121-131
2392-2192
Pojawia się w:: World Scientific News
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Fatigue life of metallic material estimated according to selected models and load conditions
Autorzy:: Kluger, K.
Łagoda, T.
Tematy:: uniaxial fatigue
multiaxial fatigue
mean stress; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/281337.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 581-592
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

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.
Tematy:: fatigue life
density function
fatigue cracking; Pokaż więcej
Data publikacji:: 2009
Powiązania:: https://bibliotekanauki.pl/articles/245569.pdf Link otwiera się w nowym oknie
Źródło:: Journal of KONES; 2009, 16, 3; 431-438
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The Influence of The Degree of the Rivet Hole Sizing on the Fatigue Life
Autorzy:: Lipski, A.
Tematy:: fatigue tests
rivets
holes
fatigue life; Pokaż więcej
Data publikacji:: 2012
Powiązania:: https://bibliotekanauki.pl/articles/97917.pdf Link otwiera się w nowym oknie
Źródło:: Fatigue of Aircraft Structures; 2012, 4; 64-69
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
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 Smax. 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.
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.
Tematy:: fatigue life prediction
multiaxial fatigue
service loading; Pokaż więcej
Data publikacji:: 2014
Powiązania:: https://bibliotekanauki.pl/articles/279894.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 2; 443-458
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Low-Cycle Fatigue Characteristics of Selected Titanium, Magnesium and Aluminium Alloys
Autorzy:: Junak, G.
Tematy:: fatigue life
low-cycle fatigue
light metal alloys; Pokaż więcej
Data publikacji:: 2018
Powiązania:: https://bibliotekanauki.pl/articles/351829.pdf Link otwiera się w nowym oknie
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 4; 1949-1955
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
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 Δεt = 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 σa = 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 Nf , whereas the lowest fatigue life was found in the tests of the aluminium alloy AlCu4MgSi(A).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Nonlinear Fatigue Damage Accumulation
Autorzy:: Dębski, D. K.
Tematy:: cumulative fatigue damage
fatigue damage accumulation
cumulative damage rules
load interaction effects
fatigue life prediction; Pokaż więcej
Data publikacji:: 2015
Powiązania:: https://bibliotekanauki.pl/articles/97967.pdf Link otwiera się w nowym oknie
Źródło:: Fatigue of Aircraft Structures; 2015, 7; 18-23
2081-7738
2300-7591
Pojawia się w:: Fatigue of Aircraft Structures
Opis:: One important element of any computational fatigue analysis is the adoption of a hypothesis of fatigue damage accumulation. The most commonly used is the hypothesis of linear accumulation of fatigue damage called the Palmgren-Miner hypothesis. This linear hypothesis does not take into account a factor of great importance: the mutual influence of consecutive fatigue load sequences on each other. In the presented paper, only two consecutive load sequences linked by mutual relations have been analyzed and the results of the analysis have been shown. A more complex form which takes into account the full load history would create complex formula difficult to use. Perhaps, we should go in this direction, especially that today we have enormous computing power at our disposal.
Dostawca treści:: Biblioteka Nauki

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