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    Wyświetlanie 1-8 z 8
    Tytuł:
    The Influence of Riveting Process on Sheets Fatigue Life – the Stress State Analysis
    Autorzy:
    Szymczyk, E.
    Godzimirski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/387182.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    połączenia nitowe
    naprężenia szczątkowe
    analiza MES
    rivieted joints
    residual stresses
    FEM analysis
    Opis:
    The paper deals with estimation of a stress concentration factor in the hole area during tensile loading. The load carrying capacity and fatigue performance of sheet samples (made of 2024 aluminium alloy) with open and riveted holes are compared. Tests confirm the insignificant influence of riveting on ultimate strength, however, it strongly affects fatigue life. The material cold working around the hole causes a decrease in maximum principal stress values as well as stress concentration moves away a few millimetres (about half a rivet radius length) from the hole. During tensile loading the maximum stress values increase slower around the riveted hole than at the open one and consequently in the former case the yield stress is achieved later.
    Źródło:
    Acta Mechanica et Automatica; 2012, 6, 1; 74-81
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    State of residual stresses after the process of milling selected aluminium alloys
    Autorzy:
    Kuczmaszewski, Józef
    Łogin, Waldemar
    Pieśko, Paweł
    Zagórski, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/102158.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aluminium alloys
    high speed machining
    residual stresses
    stopy aluminium
    obróbka z dużą prędkością
    naprężenia szczątkowe
    Opis:
    The purpose of this paper was to analyse the structure and the state of residual stresses in the samples made of rolled AW-2024 and AW-7075 aluminium alloy plates, prior to machine cutting and after the process of milling under various machining conditions. The state of stresses was evaluated on the basis of measurements by means of sin2vF X-ray diffractometry and layer removal method. Furthermore, top layer microstructures were compared in half-finished product, machined product, and core material samples.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 1; 63-73
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric studies of failure mechanisms in thermal barrier coatings during thermal cycling using FEM
    Autorzy:
    Srivathsa, B.
    Das, D. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/266255.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    thermal barrier coatings
    residual stress
    failure mechanisms
    modeling and simulation
    naprężenia szczątkowe
    mechanizm uszkodzenia
    modelowanie
    symulacja
    Opis:
    Thermal barrier coatings (TBCs) are widely used on different hot components of gas turbine engines such as blades and vanes. Although, several mechanisms for the failure of the TBCs have been suggested, it is largely accepted that the durability of these coatings is primarily determined by the residual stresses that are developed during the thermal cycling. In the present study, the residual stress build-up in an electron beam physical vapour deposition (EB-PVD) based TBCs on a coupon during thermal cycling has been studied by varying three parameters such as the cooling rate, TBC thickness and substrate thickness. A two-dimensional thermomechanical generalized plane strain finite element simulations have been performed for thousand cycles. It was observed that these variations change the stress profile significantly and the stress severity factor increases non-linearly. Overall, the predictions of the model agree with reported experimental results and help in predicting the failure mechanisms.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 4; 899-915
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of thermomechanical coupling on the behaviour of athick-walled metallic tube subjected to internal pressure
    Autorzy:
    Śloderbach, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/264368.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    grubościenna rura
    naprężenia rzeczywiste
    naprężenia szczątkowe
    odkształcenia
    ciśnienie
    thick-walled tube
    thermomechanical coupling
    actual and residual stresses
    strain
    pressure
    Opis:
    In this study, the influence of thermomechanical coupling effect - the effect of thermal expansion due to dissipation of the energy of plastic deformation, with and without taking into account the stored energy of plastic deformation (SEPD) for the distribution of stresses, strains, temperature, the applied pressure and the residual stresses is examined. The residual stresses remain in a thick-walled tube (a cylindrical thick-walled tank) after removing the internal pressure in the process of purely elastic unloading. The analysis is made on the example of an analitycal solution for a thick-walled tube subjected to a quasistatically increasing internal pressure for the case of adiabatic processes (without heat flow). Since the loading with internal pressure is quasi-static (monotonic), then neglecting the process of heat flow can lead to some different results in calculated stresses, deformations, temperature, internal pressure and residual stresses. The calculations for isothermal type of processes of deformations (without heat or ideal cooling) are also performed for the estimation of these differences. The results calculated for the process with heat flow should be intermediate between the values obtained for isothermal and adiabatic processes.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 751-766
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and residual stress analysis of Strenx 700 MC welded joint
    Autorzy:
    Trško, Libor
    Lago, Ján
    Jambor, Michal
    Nový, František
    Bokůvka, Otakar
    Florková, Zuzana
    Powiązania:
    https://bibliotekanauki.pl/articles/1839521.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    residual stress
    high strength steel
    welding
    microstructure
    grain coarsening
    naprężenia szczątkowe
    stal o wysokiej wytrzymałości
    spawalnictwo
    mikrostruktura
    Opis:
    High strength low alloy (HSLA) steels are a new generation of plain carbon steels with significantly improved mechanical properties while maintaining good weldability with common commercial techniques. Residual stress and microstructural analysis of welded HSLA Strenx 700 MC was carried out in this research. Results have shown that the welding process causes significant grain coarsening in the heat affected zone. The microstructural changes are also accompanied with creation of tensile residual stress field in the weld metal and heat affected zone, reaching up-to depth of 4 mm. Tensile residual stresses are well known for acceleration of fatigue crack initiation and together with coarse grains can lead to significant decrease of the fatigue properties of the welded structure.
    Źródło:
    Production Engineering Archives; 2020, 26, 2; 41-44
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of the influence of printing parameters on the residual stress using numerical simulation
    Autorzy:
    Alzyod, Hussein
    Ficzere, Péter
    Powiązania:
    https://bibliotekanauki.pl/articles/23944758.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Fused Deposition Modeling
    3D printing
    residual stress
    Digimat-AM
    ABS
    drukowanie 3D
    wytwarzanie przyrostowe
    naprężenia szczątkowe
    Opis:
    Fused Deposition Modeling is an additive manufacturing technology that is used to create a wide range of parts and applications. Along with its benefits, there are some challenges regarding the printed parts' mechanical properties, which are associated with printing parameters like layer thickness, printing speed, infill density, printing temperature, bed temperature, infill pattern, chamber temperature, and printing orientation. One of the most crucial challenges in additive manufacturing technology is the residual stress, which significantly affects the parts like fatigue life, cracks propagation, distortions, dimensional accuracy, and corrosion resistance. Residual stress is hard to detect in the components and sometimes is costly to investigate. Printing specimens with different parameters costs money and is timeconsuming. In this work, numerical simulation using Digimat-AM software was employed to predict and minimize the residual stress in printed Acrylonitrile Butadiene Styrene material using Fused Deposition Modeling technology. The printing was done by choosing six different printing parameters with three values for each parameter. The results showed a significant positive correlation between residual stress and printing temperature and infill percentage and a negative correlation with layer thickness and printing speed. At the same time, we found no effect of the bed temperature on the residual stress. Finally, the minimum residual stress was obtained with a concentric infill pattern.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2022, 4, 1; 150-156
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residual stress analysis of insulation coatings for magnet technologies
    Analiza naprężeń szczątkowych w izolacyjnych powłokach ochronnych do zastosowań w magnesach
    Autorzy:
    Guney, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/352547.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    residual stress
    sol-gel
    MgO-ZrO2
    insulation and superconducting magnet
    naprężenia szczątkowe
    zol-żel
    izolacja i nadprzewodzący magnes
    Opis:
    High temperature MgO-ZrO2 insulation coatings were grown on long-length Stainless-Steel (SS) tapes by reel-to-reel sol-gel method for applications of High Temperature Superconductor/Low Temperature Superconductor (HTS/LTS) coils and magnets. The residual stresses were investigated analytically at various temperature ranges, 580°C to 25°C (room temperature) and -196°C (liquid helium temperature), and 630°C to 25°C and -196°C for different thicknesses to be 13, 12, and 7 μm. The maximum stress values were obtained to be 1.92 GPa in tension for SS substrate with the 13 μm coating and -2.42 GPa in compression for the 7 μm MgO-ZrO2 coating in the temperature range between 630°C and liquid helium temperature. The surface morphologies and microstructure of sample were also characterized using a scanning electron microscope (SEM). SEM observations revealed that MgO-ZrO2 coatings have a mosaic like crack structure.
    Wysokoemperaturowe powłoki izolacyjne MgO-ZrO2 wytworzono na długich taśmach ze stali nierdzewnej metodą reel-toreel zol-żel dla zastosowań w cewkach i magnesach typu wysokotemperaturowy nadprzewodnik/niskotemperaturowy nadprzewodnik. Naprężenia badano analitycznie w różnych zakresach temperatur, 580°C do 25°C (temperatura pokojowa) i -196°C (temperatura ciekłego helu), oraz 630°C do 25°C i -196°C dla różnych grubości powłoki: 13, 12 i 7 μm. Maksymalne wartości naprężeń otrzymano w zakresie temperatur pomiedzy 630°C a temperatura ciekłego helu: 1,92 GPa (rozciągające) dla podłoża ze stali nierdzewnej z powłoką o grubości 13 μm oraz -2,42 GPa (ściskające) dla powłoki MgO-ZrO2 o grubości 7 μm. Morfologia powierzchni i mikrostruktura próbek zostały również scharakteryzowane za pomocą skaningowego mikroskopu elektronowego (SEM). Obserwacje w SEM wykazały, że powłoki MgO-ZrO2 mają strukturę pęknięć podobną do mozaiki.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 3; 673-676
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Features of Formation Stress State of Amorphized Detonation Coatings of the Zr-Al-B Systems
    Autorzy:
    Pashechko, Mykhaylo
    Kharchenko, Olena
    Shchepetov, Vitaliy
    Lenik, Klaudiusz
    Gladkiy, Yaroslav
    Powiązania:
    https://bibliotekanauki.pl/articles/102275.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    amorphous coatings
    residual stresses
    annealing temperature
    wear resistance
    detonation spraying
    powłoki amorficzne
    naprężenia szczątkowe
    temperatura wyżarzania
    odporność na zużycie
    natrysk detonacyjny
    Opis:
    The results of experimental studies on the dependence of the thickness of amorphous-crystalline Zr-Al-B coatings on the value and level of distribution of type 1residual stresses were presented. It was demonstrated that residual compressive stresses arise in the surface layers of coatings, which in absolute value are not significant for its integrity and quality. It was established that the amorphous-crystalline composition, under the conditions of minimizing residual stresses and the optimal combination of the volume fraction of components, the structure and morphology of their components, has the best surface strength and wear resistance under friction compared to tungsten carbide and iron coatings
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 2; 46-50
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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