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    Wyświetlanie 1-8 z 8
    Tytuł:
    Numerical analysis of the critical state of thin-walled structure with Z-profile cross section
    Autorzy:
    Różyło, P.
    Łukasik, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/101904.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    thin-walled structures
    finite element method
    composites
    buckling
    Opis:
    The object of the study was a thin-walled profile with Z-shaped cross section made of the carbon-epoxy composite. The material model was prepared based on the implemented orthotropic properties. The purpose of the study was to determine the value of the critical load at which buckling occurs, the form of buckling and operating characteristics in critical condition. In order to achieve this numerical analysis were carried out. Additionally, the effects of the modification in arrangement of layers of the laminate to the stability and strength of thin-walled composite structures was presented. Numerical studies were carried out using commercial simulation software - ABAQUS®. Within the FEM research, both forms of buckling and the associated critical load, dependent on the configuration the layers of the composite were achieved. The analysis of the obtained results allowed the evaluation of the structure’s work in relation to the level of energy consumption or rigidity estimation. In the paper only numerical simulations of the critical state were conducted.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 1; 194-200
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of eccentricity of load on critical force of thin-walled columns CFRP
    Autorzy:
    Wysmulski, P.
    Kráľ, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/102239.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    finite element method
    buckling
    eccentricity load
    thin-walled structures
    laminate
    composite CFRP
    Opis:
    The subject of study was a thin-walled C-section made of carbon fiber reinforced polymer (CFRP). Column was subjected to eccentric compression in the established direction. In the computer simulation, the boundary conditions were assumed in the form of articulated support of the sections of the column. Particular studies included an analysis of the effects of eccentricity on the critical force value. The research was conducted using two independent research methods: numerical and experimental. Numerical simulations were done using the finite element method using the advanced system Abaqus®. The high sensitivity of the critical force value corresponding to the local buckling of the channel section to the load eccentricity was demonstrated.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 3; 109-113
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability of the thin-walled angle column made of bio-laminate versus glass-laminate under axial compression – numerical study
    Autorzy:
    Gawryluk, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/27309877.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    bio-laminates
    buckling
    thin-walled structures
    FEM
    eigenproblem
    biolaminat
    wyboczenie
    konstrukcje cienkościenne
    MES
    problem własny
    Opis:
    The aim of this study was to determine how the change of glass laminate fibres to flax fibres will affect the stability of thin-walled angle columns. Numerical analyses were conducted by the finite element method. Short L-shaped columns with different configurations of reinforcing fibres and geometric parameters were tested. The axially compressed structures were simply supported on both ends. The lowest two bifurcation loads and their corresponding eigenmodes were determined. Several configurations of unidirectional fibre arrangement were tested. Moreover, the influence of a flange width change by ±100% and a column length change by ±33% on the bifurcation load of the compressed structure was determined. It was found that glass laminate could be successfully replaced with a bio-laminate with flax fibres. Similar results were obtained for both materials. For the same configuration of fibre arrangement, the flax laminate showed a lower sensitivity to the change in flange width than the glass material. However, the flax laminate column showed a greater sensitivity to changes in length than the glass laminate one. In a follow-up study, selected configurations will be tested experimentally.
    Źródło:
    Archive of Mechanical Engineering; 2023, LXX, 1; 43--61
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FEM and experimental analysis of thin-walled composite elements under compression
    Autorzy:
    Różyło, P.
    Wysmulski, P.
    Falkowicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/265805.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    thin-walled structures
    finite element method
    numerical and experimental investigations
    buckling
    struktury cienkościenne
    metoda elementów skończonych
    badania numeryczne
    badania eksperymentalne
    Opis:
    Thin-walled steel elements in the form of openwork columns with variable geometrical parameters of holes were studied. The samples of thin-walled composite columns were modelled numerically. They were subjected to axial compression to examine their behavior in the critical and post-critical state. The numerical models were articulately supported on the upper and lower edges of the cross-section of the profiles. The numerical analysis was conducted only with respect to the non-linear stability of the structure. The FEM analysis was performed until the material achieved its yield stress. This was done to force the loss of stability by the structures. The numerical analysis was performed using the ABAQUS® software. The numerical analysis was performed only for the elastic range to ensure the operating stability of the tested thin-walled structures.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 393-402
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupled static and dynamic buckling modelling of thin-walled structures in elastic range review of selected problems
    Autorzy:
    Kołakowski, Z.
    Teter, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/387475.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    interaction
    buckling
    thin-walled structures
    FEM
    analytical-numerical method
    review
    odkształcenia
    konstrukcje cienkościenne
    metoda analityczno-numeryczna
    metoda elementów skończonych
    MES
    Opis:
    A review of papers that investigate the static and dynamic coupled buckling and post-buckling behaviour of thin-walled structures is carried out. The problem of static coupled buckling is sufficiently well-recognized. The analysis of dynamic interactive buckling is limited in practice to columns, single plates and shells. The applications of finite element method (FEM) or/and analytical-numerical method (ANM) to solve interaction buckling problems are on-going. In Poland, the team of scientists from the Department of Strength of Materials, Lodz University of Technology and co-workers developed the analytical-numerical method. This method allows to determine static buckling stresses, natural frequencies, coefficients of the equation describing the post-buckling equilibrium path and dynamic response of the plate structure subjected to compression load and/or bending moment. Using the dynamic buckling criteria, it is possible to determine the dynamic critical load. They presented a lot of interesting results for problems of the static and dynamic coupled buckling of thin-walled plate structures with complex shapes of cross-sections, including an interaction of component plates. The most important advantage of presented analytical-numerical method is that it enables to describe all buckling modes and the post-buckling behaviours of thin-walled columns made of different materials. Thin isotropic, orthotropic or laminate structures were considered.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 2; 141-149
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations into the stability of thin-walled composite structures with top-hat cross-sections
    Autorzy:
    Czajka, Błażej
    Powiązania:
    https://bibliotekanauki.pl/articles/2204593.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    buckling
    post-buckling equilibrium paths
    critical loads
    thin-walled composite structures
    finite element method
    FEM
    experimental tests
    Opis:
    This paper presents a study of compressed thin-walled composite columns with an open cross-section. The tested specimens with a top-hat cross-section were made of CFRP material. Two arrangements of composite layers [0/-45/45/90]s and [90/0/90/0]s were compared. The paper focuses on the buckling phenomenon and the determination of the critical loads of the structure. It includes both numerical analyses using the finite element method (FEM) and validation on real specimens made using the autoclave technique. A comparison is made between the results obtained by both methods. The critical forces of the real specimens were determined using the P-wc3 approximation method. Both the evaluation of the buckling shape and the values of the critical forces showed a significant correlation between the experimental and numerical tests. This paper also compares the tested lay-ups.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 3; 311--316
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of stress distribution patterns in post-criticaldeformation states of thin-walled skins subjected to operating loads
    Określanie rozkładów naprężeń w stanach deformacji zakrytycznych elementów pokryć cienkościennych poddawanych obciążeniom eksploatacyjnym
    Autorzy:
    Kopecki, T.
    Mazurek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/300648.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    buckling
    thin-walled structures
    aircraft load-bearing structures
    shearing
    finite element method
    nonlinear numerical analyses
    operating stability
    wyboczenie
    ustroje cienkościenne
    lotnicze struktury nośne
    ścinanie
    metoda elementów skończonych
    nieliniowe analizy numeryczne
    trwałość eksploatacyjna
    Opis:
    The paper presents results of research on thin-walled structures constituting models of skin components of aircraft load-bearing structures subject to shearing. The type of load and deformation correspond to the typical state of such a structure under operating conditions. Results of experiments carried out on models and nonlinear numerical analyses based on the finite element method for a number of load-bearing structure variants. Methods suitable for verification of results of numerical calculations are proposed and an effective set of numerical procedures is selected allowing to obtain reliable results of calculations.
    Praca prezentuje wyniki badań ustrojów cienkościennych, stanowiących modele fragmentów pokryć lotniczych struktur nośnych, poddawanych ścinaniu. Rodzaj obciążenia oraz deformacji odpowiada typowemu stanowi struktury w warunkach eksploatacji. Przedstawiono wyniki badań eksperymentalnych i nieliniowych analiz numerycznych w ujęciu metody elementów skończonych szeregu wariantów ustrojów nośnych. Opracowano metody weryfikacji wyników obliczeń numerycznych oraz dobrano efektywny zestaw procedur numerycznych pozwalających na uzyskanie wiarygodnych wyników obliczeń.
    Źródło:
    Eksploatacja i Niezawodność; 2014, 16, 4; 608-615
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability Problems of Compressed Thin-Walled Structures
    Autorzy:
    Dębski, Hubert
    Powiązania:
    https://bibliotekanauki.pl/articles/102166.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    thin-walled columns
    composite structures
    buckling
    finite element modelling
    kolumny o cienkich ścianach
    struktury kompozytowe
    wyboczenie
    modelowanie elementów skończonych
    Opis:
    The object of this study involves thin-walled columns made of carbon-epoxy composite with open top-hat cross-section. The material used comprised a composite of epoxy matrix reinforced with carbon fiber (system HexPly M12, Hexcel). The M12 system is used above all in aircraft structures. It exhibits high fatigue durability and good maintenance properties at relatively low specific gravity. The research was carried out as the FEM numerical analyses and experimental tests in buckling and post-buckling state. The numerical tool used was the ABAQUS software.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 4; 190-198
    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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