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    Wyświetlanie 1-9 z 9
    Tytuł:
    Research on the Degradation Process of Railway Rails Due to Lifespan Exceeding
    Autorzy:
    Berbecaru, Andrei-Constantin
    Coman, George
    Ciucă, Sorin
    Gherghescu, Ioana-Arina
    Sohaciu, Mirela
    Grădinaru, Catalin
    Predescu, Cristian
    Powiązania:
    https://bibliotekanauki.pl/articles/2106587.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    degradation
    advanced wear
    fatigue fracture
    railway rails lifespan
    Opis:
    The paper presents the impact of exceeding the railway rails lifespan which usually causes a railway structural failure, thus an accident. The research highlights the rails’s high degradation, especially on the running area, consisting in 60-70% weight loss by advanced wear of the rail, followed by fatigue fracture caused by alternating cyclic stresses that initiates the crack and also by tensile stresses resulting in the crack growth. The chemical composition, structural and mechanical properties were analyzed in order to establish the causes that led to the railway rails rupture.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 535--540
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Fatigue Fracture Study on TDCB Aluminum Foam Specimen of Type Mode III Bonded with Adhesive
    Autorzy:
    Lee, J. H.
    Cho, J. U.
    Powiązania:
    https://bibliotekanauki.pl/articles/356731.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum foam
    fatigue fracture
    fatigue analysis
    load
    Mode III type
    specimen thickness
    Opis:
    This paper studies the characteristics of junction structure of closed-cell type aluminum foam, which is generally used as a shock absorber. TDCB specimens were designed for mode III type with thickness as a variable and performed a fatigue experiment on them by thickness. As the result, the load value of all specimens peaks under 0 to 25 cycles and decreases as the cycles increase. As the specimen thickens by 10 mm, the maximum load value is 1.2 times. When the thickness increases by 20 mm, the maximum value increases by 1.5 times. This study result can be utilized by investigating the mechanical characteristics of TDCB specimens for mode III type under fatigue loading conditions systematically and efficiently.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1359-1362
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Simulation of Fatigue Fracture of the Turbine Disc
    Autorzy:
    Witek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/97889.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    aircraft engine
    crack propagation analysis
    finite element method
    fatigue fracture
    Opis:
    This paper presents the results of the crack propagation analysis of an aircraft engine turbine disc. In the first part of the work the finite element method was used for calculation of the stress state and the stress intensity factor (SIF, KI, K-factor) in the turbine disc with an embedded quarter-elliptical corner crack, subjected to low-cycle thermo-mechanical fatigue. To refine the K-factor calculation, specially degenerated finite elements were used. These elements provide stress singularity suitable for the linear-elastic material of the disc. The performed calculations yielded the stress intensity factor KI for different crack sizes. Subsequently, ΔK parameter was determined as a difference of the KI values calculated for the turbine’s speeds equal to 6373 and 14200 RPM. Based on the Paris-Erdogan equation and the obtained ΔK values, the fatigue crack growth plot for the turbine disc subjected to complex thermo-mechanical loads was determined.
    Źródło:
    Fatigue of Aircraft Structures; 2012, 4; 114-122
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue fracture of nitrided and carbonitrided layers
    Pękanie zmęczeniowe warstw azotowanych i węgloazotowanych
    Autorzy:
    Nakonieczny, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/280779.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    pękanie zmęczeniowe
    warstwy azotowane
    warstwy węgloazotowane
    właściwości zmęczeniowe
    fatigue fracture
    nitriding
    corbonitriding
    hardness
    fracture pattern
    Opis:
    The phenomenon of fatigue fracture of nitrided and carbonitrided layers is described in the paper. Fatigue bechaviour is described by analysing properties of the substrate and surface layer. The effect of microhardness of the substrate on fatigue properties of nitrided layers is obtained. Smith's diagrams for carbonitrided layers are presented. A graphical pattern for prediction of the place of failure initiation is suggested. Future directions of the examination with tribology and corrosion effects taken into account are marked in the paper.
    W artykule opisano zjawisko pękania zmęczeniowego warstw azotowanych i węgloazotowanych. Właściwości zmęczeniowe opisano przez analizę właściwości podłoża i warstwy wierzchniej. Określono wpływ mikrotwardości podłoża na właściwości zmęczeniowe warstwy azotowanej. Prezentowane są wykresy Smith'a dla warstwy węgloazotowanej. Przedstawiono graficzną metodę dla przewidywania miejsca inicjacji pękania zmęczeniowego. Przedstawiono kierunki badań właściwości tribologicznych i korozyjnych.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2006, 44, 3; 713-730
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure analysis of a femoral hip stem made of stainless steel after short time of exposure
    Autorzy:
    Mierzejewska, Ż. A.
    Oksiuta, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/386661.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    hip replacement
    endoprosthesis stem fracture
    isolated fracture
    total hip arthroplasty complications
    fatigue fracture
    proteza stawu biodrowego
    endoproteza
    pękanie zmęczeniowe
    Opis:
    This paper describes a case study summarising the failure analysis of a stainless steel femoral stem, which failed prematurely within 36 months of exploitation in human body. In order to determine the mechanism of failure, a broken stem component were analyzed by means of macroscopic and microscopic obserwations and hardness measurements. Metallurgical obserwations revealed that the tested material does fulfill ASTM requirements. Scanning electron microscopy images revealed the presence of stress-induced cracking. The results of the hardness revealed significant nonuniformity from the surface towards the inner part of the stem. It is assumed that any discontinuity or defect on the fracture surface of the stem acted as preferential site for a crack nucleation and propagation by fatigue until the cross section of stem was not able to sustain a load generated by a patient.
    Źródło:
    Acta Mechanica et Automatica; 2014, 8, 3; 146-150
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of non-zero mean stress bending-torsion fatigue on fracture surface parameters of 34CrNiMo6 steel notched bars
    Autorzy:
    Macek, Wojciech
    Szala, Mirosław
    Trembacz, Jarosław
    Branco, Ricardo
    Costa, José
    Powiązania:
    https://bibliotekanauki.pl/articles/1839494.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    multiaxial fatigue
    bending-torsion
    notch effect
    fatigue fracture
    surface topography
    zmęczenie wieloosiowe
    zginanie
    skręcanie
    efekt wycięcia
    złamanie zmęczeniowe
    topografia powierzchni
    Opis:
    Modern methods of testing materials require the use of the latest technologies and combining measurement and calculation methods. It is important to find a quantitative way of describing, among other things, the failures so that it can help to design with high accuracy. This paper studies loading orientations on crack shape and fracture surface changes. The advantage of the entire fracture surface method is simplicity and applicability in studies on other materials, shapes and loadings. A higher values of fracture surface parameters (Sx, Vx) was observed in failure specimens with lower σ/τ (B/T) ratios. It has been observed that largest crack lengths with a small number of cycles occur for loading combinations different then B=T. As well as analyzed surface parameters Sx, Vx, are higher for larger number of cycles to crack initiation (Ni) values.
    Źródło:
    Production Engineering Archives; 2020, 26, 4; 167-173
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue characteristics of materials used in transport industry applications
    Autorzy:
    Belan, Juraj
    Kuchariková, Lenka
    Mazur, Magdalena
    Tillová, Eva
    Chalupová, Mária
    Powiązania:
    https://bibliotekanauki.pl/articles/88678.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    fatigue properties
    Inconel alloy
    aluminum alloy
    fatigue fracture
    transportation safety
    właściwości zmęczeniowe
    stop Inconel
    stop aluminium
    pęknięcie zmęczeniowe
    próba zmęczeniowa
    bezpieczeństwo transportu
    Opis:
    Designers have a major interest about fatigue properties of materials used in transport industry. Each component in transport works under alternating stress. From this point of view the fatigue properties are important for single parts lifetime resulting into safety of whole components as cars and airplanes what leads to safety on the roads or air and have influence on human life as well. Therefore this paper deals with fatigue properties of wrought Inconel alloy IN 718 and aluminum cast alloy AlSi9Cu3. Both materials were put on fatigue push – pull test, but Ni – based IN 718 alloy at frequency of loading around 20 000 kHz (High Frequency High Cycles Fatigue) and aluminum alloy AlSi9Cu3 at frequency of loading around 80 Hz (Low Frequency High Cycles Fatigue). These parameters were chosen with respect of usage such materials for production of components used in transport industry applications. Results after fatigue tests are presented as Wohler curve. For prediction of source of fracture the SEM fractography analysis of fatigue fracture surfaces was made.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 810-818
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microdamage distribution in fatigue fractures of bone allografts following gamma-ray exposure
    Autorzy:
    Presbítero, G.
    Hernandez-Rodríguez, M. A. L.
    Contreras-Hernandez, G. R.
    Vilchez, J. F.
    Susarrey, O.
    Gutiérrez, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/307297.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    rozkład Weibulla
    pękanie zmęczeniowe
    promieniowanie gamma
    kość korowa
    mikrouszkodzenia
    allografts
    Weibull distribution
    fatigue fracture
    gamma radiation
    cortical bone
    microdamage
    Opis:
    Although clear evidence of significant differences in bone properties have been extensively studied, results vary under the ranges usually used for sterilization purposes (25-35 kGy). Hence, the aim of this work was the study of the mechanical properties and microdamage development of human bones used as allografts following gamma-ray exposure, followed by an extensive statistical analysis of microdamage effects in fatigue behaviour. Methods: Specimens of the cortical region of human femurs were exposed to 15-25 kGy and 26-30 kGy radiation levels, then they were subjected to compression fatigue tests until fracture. The fatigue life was determined in relation to the radiation level, and the evolution of microdamage was assessed through fluorescence microscopy in order to calculate characteristic lengths of microcracks. Results: Significant differences in fatigue life were detected (p < 0.05) between non-radiated (control) and radiated specimens, resulting in a drastic 89.2% fatigue life reduction of the 15-25 kGy group, and 95.3% in the 26-30 kGy group in comparison to the control. Microdamage analysis showed a considerable increase in microcrack lengths when bone was exposed to gamma radiation, which may indicate that bones used as allografts could fracture at some point when subjected to in vivo loading conditions. Conclusions: The results of our research indicate that, even if a range of 15-25 kGy is suggested to sterilize bone allografts, such practice needs to be reconsidered. In addition, with use of Weibull distribution, this work describes the conditions in which microcracks grow towards the fracture of bones in relation to the decrease in their mechanical properties.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 4; 43-53
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of the cause of the stem neck fracture in the hip joint endoprosthesis
    Autorzy:
    Ryniewicz, A. M.
    Bojko, Ł.
    Ryniewicz, A.
    Pałka, P.
    Ryniewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/265412.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    proteza plastyczna
    złamanie zmęczeniowe
    metoda elementów skończonych
    skaningowa mikroskopia elektronowa
    prosthetic arthroplasty
    stem construction
    fatigue fracture
    FEM
    SEM (scanning electron microscopy)
    Opis:
    Endoprosthesis stem fractures are among the rarest complications that occur after hip joint arthroplasty. The aim of this paper is to evaluate the causes of the fractures of the Aura II stem neck, which is an element of an endoprosthesis implanted in a patient. In order to achieve it, a radiogram was evaluated, the FEM analysis was carried out for the hip joint replaced using the Aura II prosthesis and scanning tests as well as a chemical analysis were performed for the focus of fatigue. The tests performed indicate that the most probable causes leading to the fatigue fracture of the Aura II stem under examination were material defects in the process of casting and forging (forging the material with delamination and the presence of brittle oxides and carbides) that resulted in a significant reduction of strength and resistance to corrosion. In the light of an unprecedented stem neck fracture, this information should be an indication for non-destructive tests of ready-made stems aiming to discover the material and technological defects that may arise in the process of casting and drop forging.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 1; 223-234
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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