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    Wyświetlanie 1-9 z 9
    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 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).
    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
    Artykuł
    Tytuł:
    Fatigue Properties of AZ31 and WE43 Magnesium Alloys
    Autorzy:
    Junak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/352138.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low-cycle fatigue
    mechanical properties
    magnesium alloy
    Opis:
    The paper presents low-cycle fatigue (LCF) characteristics of selected magnesium alloys used, among others, in the automotive and aviation industries. The material for the research were bars of magnesium alloys AZ31 and WE43 after hot plastic working. Due to their application(s), these alloys should have good/suitable fatigue properties, first of all fatigue durability in a small number of cycles. Low-cycle fatigue tests were carried out on the MTS-810 machine at room temperature. Low-cycle fatigue trials were conducted for three total strain ranges Δεt of 0.8%, 1.0% and 1.2% with the cycle asymmetry factor R = –1. Based on the results obtained, fatigue life characteristics of materials, cyclic deformation characteristics σa = f(N) and cyclic deformation characteristics of the tested alloys were developed. The tests have shown different behaviors of the tested alloys in the range of low number of cycles. The AZ31 magnesium alloy was characterized by greater fatigue life Nf compared to the WE43 alloy.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 721-726
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Attempt of the Low-Cycle Fatigue Life Description of Chosen Creep-Resistant Steels Under Mechanical and Thermal Interactions
    Autorzy:
    Okrajni, J.
    Marek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/354016.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low-cycle fatigue
    high temperatures
    fatigue life prediction
    creep-resistant steels
    Opis:
    The study focuses on the problem of determination of low-cycle fatigue properties for the chosen group of creep-resistant steels used in the power and chemical industries. It tries to find the parameter which would describe well the fatigue life and take into account mechanical loads and temperature. The results of LCF tests have been presented in the paper. New parameter P has been introduced. This parameter joins a plastic strain range, a stress range and temperature. The fatigue life has been predicted versus parameter P. The comparison of the predicted and observed values of fatigue life shows the agreement between these values. The method of fatigue life prediction formulated in this way is expected to describe the behavior of materials under thermo-mechanical fatigue.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2349-2353
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Surface Roughness on the High Temperature / High Strain Low Cycle Fatigue Behavior of Nickel-Based Superalloy Rene®80
    Autorzy:
    Barjesteh, Mohammad Mehdi
    Powiązania:
    https://bibliotekanauki.pl/articles/27313861.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    superalloy
    Rene®80
    surface roughness
    low cycle fatigue
    fracture surface
    Opis:
    Since fatigue cracks nucleate and initiate generally at the surface of the rotary components such as blades and discs, the surface condition is the most important factor affecting the fatigue life. Surface scratches are suitable sites for stress concentrations and therefore the nucleation stage of fatigue cracks will be shortened. In the present work, the influence of surface roughness on the low cycle fatigue life behavior of nickel-based superalloy Rene®80 at the temperature of 900°C was evaluated. Results of low cycle fatigue tests (LCF) under strain-controlled condition at 900°C for R = εmin/εmax = 0 and strain rate of 2×10-3 s-1, at a total strain range of 1.2% showed an inverse relationship between fatigue strength and surface roughness of the specimens. In this study, increasing the surface roughness of Rene®80 from 0.2 μm to 5.4 μm led to the decline in the final LCF life from 127 cycles to 53 cycles which indicated a 58.3% reduction in fatigue life at the same condition. Fractography evaluation also exhibited that fatigue cracks initiated from the notch in the rough specimens, whereas in the smooth specimen fatigue cracks nucleated from the internal imperfections and carbides.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 507--516
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Welding Parameters and Metal Arrangement of the AA2024-T3 on the Quality and Strength of FSW Lap Joints for Joining Elements of Landing Gear Beam
    Autorzy:
    Myśłiwiec, P.
    Śliwa, R. E.
    Ostrowski, R.
    Bujny, M.
    Zwolak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/356961.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FSW lap joints
    aluminum alloys
    landing gear beam
    low cycle fatigue test
    Opis:
    The paper presents the possibility of using FSW technology for joining elements of a landing gear beam of the M28 aircraft. The FSW process was performed on a 4-axis numerical machine under industrial conditions. However, before welding was carried out under industrial conditions, preliminary experimental tests were carried out under laboratory conditions. Preliminary research was carried out for AA2024-T3 aluminum sheets of 1 mm and 3 mm in thickness, joined in a lap configuration. The influence of technological and geometric parameters of the process on the quality and strength of the weld was examined. Sheet metal arrangement was analyzed. Tests were carried out for two configurations. The first of which with 1 mm sheet on the top and 3 mm sheet on the bottom and in reverse order. It has been shown that setting a thicker plate on the top gives a 40% better strength. The microhardness and microstructure of the weld were tested. During the laboratory tests, low-cycle fatigue tests of the FSW lap joint were performed. It has been shown that the FSW method can be an alternative to the riveting process in the production of aviation structure elements.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1203-1216
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue Characteristics of Selected Light Metal Alloys
    Autorzy:
    Cieśla, M.
    Junak, G.
    Marek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/357014.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ti-6Al-4V titanium alloy
    2017A aluminium alloy
    AZ31 magnesium alloy
    low-cycle fatigue
    high-cycle fatigue
    fatigue life
    Opis:
    The paper addresses results of fatigue testing of light metal alloys used in the automotive as well as aerospace and aviation industries, among others. The material subject to testing comprised hot-worked rods made of the AZ31 alloy, the Ti-6Al-4V two-phase titanium alloy and the 2017A (T451) aluminium alloy. Both low- and high-cycle fatigue tests were conducted at room temperature on the cycle asymmetry ratio of R=-1. The low-cycle fatigue tests were performed using the MTS-810 machine on two levels of total strain, i.e.Δεc= 1.0% and 1.2%. The high-cycle fatigue tests, on the other hand, were performed using a machine from VEB Werkstoffprufmaschinen-Leipzig under conditions of rotary bending. Based on the results thus obtained, one could develop fatigue life characteristics of the materials examined (expressed as the number of cycles until failure of sample Nf) as well as characteristics of cyclic material strain σa=f(N) under the conditions of low-cycle fatigue testing. The Ti-6Al-4V titanium alloy was found to be characterised by the highest value of fatigue life Nf, both in lowand high-cycle tests. The lowest fatigue life, on the other hand, was established for the aluminium alloys examined. Under the high-cycle fatigue tests, the life of the 2017A aluminium and the AZ31 magnesium alloy studied was determined by the value of stress amplitude σa. With the stress exceeding 150 MPa, it was the aluminium alloy which displayed higher fatigue life, whereas the magnesium alloy proved better on lower stress.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 271-274
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction Stir Welding of Ultrathin AA2024-T3 Aluminum Sheets Using Ceramic Tool
    Autorzy:
    Myśliwiec, P.
    Śliwa, R. E.
    Ostrowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/355870.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir welding
    aluminum alloys
    ceramic tools
    FSW force measurements
    low-cycle fatigue test
    FSW joint durability
    Opis:
    The paper presents the results of research work on linear FSW (Friction Stir Welding) joining aluminum alloys AA2024-T3 of 0.5 mm in thickness. The study was conducted on properly adapted numerical controlled 3 axis milling machine using a ceramic tool and special designed fastening device. The tool dimensions have been estimated according to the algorithm shown in the literature [4]. All joints were made of end-to end (butt) configuration under different welding speed. The rotational speed of the tool and tool offset was constant. The effect of selected technological parameters on the quality of the joint was analyzed. Produced butt joint have been subjected to a static tensile testing to identify mechanical features of the materials of joints compared to parent materials. Measurements of micro hardness HV in the plastically formed stir zone of joint and in the parent material have been carried out. Axial and radial welding forces in the joining region were recorded during the tests and their dependency from the welding parameters was studied. Based on the results of strength tests the efficiency of joints for sheets of 0.5 mm in thicknesses oscillated up to 96% compared to the parent material. It has been found that for given parameters the correct, free of defects joints were obtained. The paper also presents the results of low-cycle fatigue tests of obtained FSW joints. The use of a ceramic tool in the FSW process allows to obtain welds with higher strength than conventional tools. The results suggests that FSW can be potentially applied to joining aluminum alloys.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1385-1394
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Load History on Durability of P92 Steel Used for the Construction of Energy Pipelines
    Wpływ historii obciążenia na trwałość stali P92 stosowanej do budowy rurociągów energetycznych
    Autorzy:
    Cieśla, M.
    Junak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/354060.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    P92 steel
    load history
    creep
    low-cycle fatigue
    stal P92
    wysokoobciążone bloki energetyczne
    pełzanie
    zmęczenie niskocyklowe
    Opis:
    The research material used in the study was the martensitic creep-resistant steel P92 used for the manufacture of pipes being part of power generation units subject to heavy load. The research problem focused on two issues. The first one was to analyze how the plastic deformation cumulated in the material in low-cycle fatigue conditions affects the characteristics of the material in creep conditions in a temperature of 600ºC. The other one was concerned with analysis of a reverse situation, i.e. how the initial plastic deformation of the material in creep conditions changes the mechanical characteristics of the steel under low-cycle fatigue conditions in a temperature of 600ºC.
    W pracy materiałem badawczym była żarowytrzymała stal martenzytyczna P92 wykorzystywana do wytwarzania rur wchodzących w skład wysokoobciążonych bloków energetycznych. Problem badawczy koncentrował się na dwóch zagadnieniach. W pierwszym analizowano jak odkształcenie plastyczne kumulowane w materiale w warunkach procesu zmęczenia niskocyklowego wpływa na charakterystyki materiału w warunkach pełzania w temperaturze 600ºC. W drugim analizowano sytuację odwrotną, tzn. jak wstępna deformacja plastyczna materiału w warunkach pełzania zmienia charakterystyki mechaniczne stali w warunkach zmęczenia niskocyklowego w temperaturze 600ºC.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3A; 1853-1857
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Durability of X10CrMoVNb9-1 Steel Tubes Under Low-Cycle Fatigue and Creep Conditions after Bending with Local Induction Heating
    Trwałość w warunkach zmęczenia niskocyklowego i pełzania materiału rury ze stali X10CrMoVNb9-1 po procesie gięcia z lokalnym nagrzewem indukcyjnym
    Autorzy:
    Cieśla, M.
    Junak, G.
    Tomczak, J.
    Findziński, R.
    Kawała, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/355163.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tube bending
    numerical modelling
    mechanical properties
    creep
    low-cycle fatigue
    modelowanie numeryczne
    właściwości mechaniczne
    gięcie rur
    pełzanie
    zmęczenie niskocyklowe
    Opis:
    The paper contains the results of theoretical and experimental research on the tube bending process used in the manufacturing of X10CrMoVNb9-1 steel tubes with dimensions 530 × 90 mm. An innovative technology in which the tube bending is coupled with local induction heating and the results of finite-element numerical modelling of tube bending using Simufact Forming 11.0 software are presented. A change of the geometry in the cross-section of the bend area was subjected to analysis, including the ovalization of the cross-section and the wall thickness in the regions subject to tension and compression. The geometrical features of the bend determined on the basis of numerical calculations were compared with the measurement results obtained in industrial conditions. Basic mechanical properties of the tube in the as-delivered condition and of the fabricated tube bend were determined using tensile, hardness, impact, low-cycle fatigue and creep tests. It was proved that the tube bend made of the X10CrMoVNb9-1 steel, obtained by the proposed technology, meets the requirements of the applicable standards.
    W artykule zawarto wyniki analizy teoretycznej i doświadczalnej procesu gięcia rur ze stali X10CrMoVNb9-1 o wymiarach 530 × 90 mm. Przedstawiono innowacyjną technologię procesu gięcia rur z lokalnym nagrzewaniem indukcyjnym oraz wyniki modelowania numerycznego kształtowania łuku rurowego metodą elementów skończonych z użyciem programu Symufact Forming 11.0. Analizowano zmianę geometrii na przekroju poprzecznym łuku w tym; owalizację przekroju, grubość ścianek w strefie rozciąganej i ściskanej. Cechy geometryczne łuku określone na podstawie obliczeń numerycznych porównano z wynikami pomiarów w warunkach przemysłowych. Określono podstawowe właściwości mechaniczne rury w stanie dostawy i wykonanego łuku na podstawie przeprowadzonych prób; rozciągania, twardości, udarności, zmęczenia niskocyklowego i pełzania. Wykazano, że wykonany łuk rurowy ze stali X10CrMoVNb9-1 gięty zaproponowaną technologią spełnia wymagania odpowiednich norm.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3A; 1839-1845
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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