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    Wyświetlanie 1-36 z 36
    Tytuł:
    Free vibration analysis of FGM stepped nanostructures using nonlocal dynamic stiffness model
    Autorzy:
    Lien, Tran Van
    Duc, Ngo Trong
    Dinh, Tran Binh
    Dat, Pham Tuan
    Powiązania:
    https://bibliotekanauki.pl/articles/2086972.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    nonlocal
    DSM
    FGM
    nanostructure
    nondimensional frequency
    Opis:
    A nonlocal Dynamic Stiffness Model (DSM) for free vibration analysis of Functionally Graded Material (FGM) stepped nanostructures based on the Nonlocal Elastic Theory (NET) is proposed. An exact solution to the equation of motion of a nanobeam element according to the Timoshenko beam theory, NET, and taking into account position of the neutral axis is constructed. Nondimensional frequencies and mode shapes of complete FGM stepped nanostructures are easily obtained using the nonlocal DSM. Numerical results are presented to show significance of the material distribution profile, nonlocal effect, and boundary conditions on free vibration of nanostructures.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 2; 279--292
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical and numerical free vibration analysis of porous functionally graded materials (FGPMs) sandwich plate using Rayleigh-Ritz method
    Autorzy:
    Njim, E.K.
    Bakhy, S.H.
    Al-Waily, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175769.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    FGM sandwich plate
    porosity parameter
    CPT
    free vibration
    FEA
    płyta warstwowa FGM
    parametr porowatości
    drgania swobodne
    Opis:
    Purpose: This study introduces a new approximated analytical solution of the free vibration analysis to evaluate the natural frequencies of functionally graded rectangular sandwich plates with porosities. Design/methodology/approach: The kinematic relations are developed based on the classical plate theory (CPT), and the governing differential equation is derived by employing the Rayleigh-Ritz approximate method. The FGM plate is assumed made of an isotropic material that has an even distribution of porosities. The materials properties varying smoothly in the thickness direction only according to the power-law scheme. Findings: The influences of changing the gradient index, porosity distribution, boundary conditions, and geometrical properties on the free vibration characteristics of functionally graded sandwich plates are analysed. Research limitations/implications: A detailed numerical investigation is carried out using the finite element method with the help of ANSYS 2020 R2 software to validate the results of the proposed analytical solution. Originality/value: The results with different boundary conditions show the influence of porosity distribution on the free vibration characteristics of FG sandwich plates. The results indicated a good agreement between the approximated method such as the Rayleigh-Ritz and the finite element method with an error percentage of no more than 5%.
    Źródło:
    Archives of Materials Science and Engineering; 2021, 110, 1; 27--41
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bending, buckling and free vibration of a beam with unsymmetrically varying mechanical properties
    Autorzy:
    Magnucki, K.
    Lewiński, J.
    Magnucka-Blandzi, E.
    Kędzia, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/279585.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    FGM beam
    mathematical modelling
    numerical FEM calculations
    Opis:
    The subject of the paper is a beam with unsymmetrically varying mechanical properties in the depth direction. The nonlinear hypothesis of plane cross section deformation is assumed. Based on Hamilton’s principle, two differential equations of motion are obtained. The system of equations is analytically solved with a view to analyse the bending, buckling and free vibration problems of the beam. Moreover, the FEM model of the beam is developed and deflections, critical axial forces and natural frequencies of the beam are calculated. The results of these two methods are compared.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1163-1178
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On axisymmetric heat conduction problem for multilayer graded coated half-space
    Autorzy:
    Perkowski, D. M.
    Kulchytsky-Zhyhailo, R.
    Kołodziejczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/281629.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    temperature
    heat flux
    FGM
    composite
    homogenized model
    Opis:
    The technique of integral Hankel transform to find the solution of heat conduction in half-space coated by a multilayered package of homogenous laminae is applied. The half-space is heated by the given heat flux on the boundary surface. The temperature and heat flux distribution in the radial direction is analyzed for two types of coatings: 1) when the heat conductivity coefficient is described by a power or exponential function of the distance to the boundary surface; 2) multilayered coating has a periodic structure.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 147-156
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the fibres shape effect on the temperature field in the two-phase hollow cylinder
    Autorzy:
    Ostrowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/362631.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Fizyki Budowli Katarzyna i Piotr Klemm
    Tematy:
    przewodzenie ciepła
    FGM
    kompozyt
    heat conduction
    composite
    Opis:
    The unidirectional stationary heat conduction in two-phase hollow cylinder is considered. The conductor is made of two-phase stratified composites and has, in special cases, asmooth gradation of effective properties in the radial direction. Therefore, we deal here with a special case of functionally graded materials, FGM (cf. [6]). The formulation of mathematical model of the conductor is based on the tolerance averaging approach (TAA), cf. [8]. Application to the stationary heat conduction and a comparison of tolerance model with asymptotic model (cf. [7]) will be shown. The effect of fibres shape and width on the temperature field will be examined.
    Źródło:
    Fizyka Budowli w Teorii i Praktyce; 2010, T. 5, nr 3, 3; 45-48
    1734-4891
    Pojawia się w:
    Fizyka Budowli w Teorii i Praktyce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nieliniowe zagadnienie stacjonarnego przepływu ciepła w dwuskładnikowym przewodniku cylindrycznym
    On the non-linear stationary heat conduction in two-phase hollow cylinder
    Autorzy:
    Ostrowski, P
    Powiązania:
    https://bibliotekanauki.pl/articles/362637.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Fizyki Budowli Katarzyna i Piotr Klemm
    Tematy:
    przepływ ciepła
    FGM
    kompozyt
    heat conduction
    composite
    Opis:
    Celem pracy jest analiza nieliniowego stacjonarnego i jednokierunkowego przepływu ciepła w przewodniku cylindrycznym o funkcyjnie zmiennych własnościach efektywnych. Rozważany przewodnik na poziomie mikro składa się z dwufazowych komórek (pierścieni) o stałej szerokości, który przy dostatecznie dużej liczbie komórek można traktować jako materiał o funkcyjnej gradacji własności, FGM (por. [6]). Na brzegi przewodnika została narzucona stała po obwodzie temperatura, a współczynnik przewodzenia ciepła poszczególnych składników zamodelowano wielomianem pierwszego stopnia. Analizie poddano wpływ nieliniowości i rozkładu poszczególnych składników kompozytu na przebieg pola temperatury.
    The main aim is to consider non-linear stationary and unidirectional heat conduction in a hollow cylinder with functionally graded effective material properties. The conductor is made of two-phase stratified cells (annuli) with constant width, which can he treated as a functionally graded material, FGM (cf. [6]) for a sufficient large number of cells. On the composite boundaries temperature is given, and conductivity coefficients are expressed by first degree polynomial. An effect of nonlinearity and component distribution on the temperature field.
    Źródło:
    Fizyka Budowli w Teorii i Praktyce; 2011, T. 6, nr 2, 2; 83-85
    1734-4891
    Pojawia się w:
    Fizyka Budowli w Teorii i Praktyce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical creep analysis of FGM rotating disc with GDQ method
    Autorzy:
    Zharfi, H.
    Toussi, H. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/280599.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    creep
    FGM
    GDQ method
    rotating disc
    boundary conditions
    Opis:
    Rotating discs are the vital part of many kinds of machineries. Usually, they are operating at relatively high angular velocity and temperature conditions. Accordingly, in practice, the creep analysis is an essential necessity in the study of rotating discs. In this paper, the time dependent creep analysis of a thin Functionally Graded Material (FGM) rotating disc investigated using the Generalized Differential Quadrature (GDQ) method. Creep is described with Sherby’s constitutive model. Secondary creep governing equations are derived and solved for a disc with two various boundary conditions and with linear distribution of SiC particles in pure Aluminum matrix. Since the creep rates are a function of stresses, time and temperature, there is not a closed form solution to these equations. Using a solution algorithm and the GDQ method, a solution procedure for these nonlinear equations is presented. Comparison of the results with other existing creep studies in literature reveals the robustness, precision and high efficiency beside rapid convergence of the present approach.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 331-341
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of FGM plates
    Autorzy:
    Jemielita, G.
    Kozyra, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/280423.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    modelling
    layer plate
    FGM plate
    stiffness of the plate
    Opis:
    The paper presents formulation of the problem of layered plates composed of two various isotropic materials. We assume that the first material M₁ is characterized by the following parameters: Young’s modulus E₁ and Poisson’s ratio ν₁, whereas the second one by E₂ and ν₂, respectively. Let us consider two modelling cases for functionally graded material (FGM) plates. These cases are related to an appropriate distribution of the material within two-layer and three-layer systems. Our objective is to compare the stiffness of both the two-layer and there-layer plates with the FGM plate containing various proportions between the material components M₁ and M₂.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 829-839
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient numerical modeling of functionally graded shell mechanical behavior
    Autorzy:
    Koubaa, Sana
    Mars, Jamel
    Dammak, Fakhreddine
    Powiązania:
    https://bibliotekanauki.pl/articles/117748.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    FGM
    UMAT-USDFLD
    static
    free vibration
    statyka
    wolne wibracje
    Opis:
    Numerical analysis of the static bending and free vibration mechanical behavior of FGM are performed using the UMAT-USDFLD subroutines in ABAQUS software. Different combinations of geometries, mechanical loading and boundary conditions are adopted. The material properties according to the coordinates of the integration points are defined in the developed numerical model. The First Order Deformation Theory is used for thin and moderately thick FG shells analysis. The accuracy and the robustness of the numerical model are illustrated through the solution of several non trivial structure problems. The proposed numerical procedure is significantly efficient from the computational point of view.
    Źródło:
    Applied Computer Science; 2019, 15, 1; 84-94
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the nonlocal interaction range for stability of nanobeams with nonlinear distribution of material properties
    Autorzy:
    Jankowski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2105997.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    nanobeam
    FGM
    nonlocal strain gradient theory
    buckling
    piezoelectric effect
    Opis:
    The present study analyses the range of nonlocal parameters’ interaction on the buckling behaviour of nanobeam. The intelligent nonhomogeneous nanobeam is modelled as a symmetric functionally graded (FG) core with porosity cause nonlinear distribution of material parameters. The orthotropic face-sheets are made of piezoelectric materials. These kinds of structures are widely used in nanoelectromechanical systems (NEMS). The nanostructure model satisfies the assumptions of Reddy third-order beam theory and higher-order nonlocal elasticity and strain gradient theory. This approach allows to predict appropriate mechanical response of the nanobeam regardless of thin or thick structure, in addition to including nano-sized effects as hardening and softening. The analysis provided in the present study focuses on differences in results for nanobeam stability obtained based on classical and nonlocal theories. The study includes the effect of diverse size-dependent parameters, nanobeams’ length-to-thickness ratio and distributions of porosity and material properties through the core thickness as well as external electro-mechanical loading. The results show a dependence of nonlocal interaction range on geometrical and material parameters of nanobeam. The investigation undertaken in the present study provides an interpretation for this phenomenon, and thus aids in increasing awareness of nanoscale structures’ mechanical behaviour.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 2; 151--161
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Piezoelectric effect on thermoelastic Lamb waves in functionally graded plates
    Autorzy:
    Wang, X.
    Ren, X.
    Yu, J.
    Zhou, H.
    Zhang, X.
    Leng, J
    Powiązania:
    https://bibliotekanauki.pl/articles/38695708.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    thermoelastic wave
    attenuation
    FGM
    piezoelectric effect
    physical field distributions
    Opis:
    Based on the Lord–Shulman thermoelectric elasticity theory, the piezoelectric effect on the thermoelastic Lamb wave propagation in the functionally graded material (FGM) plate is investigated. The coupled wave equations are solved by employing the Legendre polynomial series approach (LSPA), which poses the advantages of small scale of eigenvalues matrix and a convenient solution. It can directly obtain the complex wave number solutions without iteration. The obtained complex solutions, which represent the wave propagation and attenuation, are compared with those available data. Numerical examples show that the influence of gradient is profound. Results indicate that the piezoelectric effects on attenuation with the open and closed circuit condition are consistent for the S0 and S1 modes, but are inconsistent for the A0 and A1 modes. Although the piezoelectric effect is weak on the dispersion and attenuation of thermal waves, it is notable for their physical field distributions. In addition, the relaxation time is critical to electric displacements of a thermal wave mode, but is not essential for those of Lamb-like modes. The results can be used for the optimization of thermo-electric-elastic coupling structures.
    Źródło:
    Archives of Mechanics; 2023, 75, 1-2; 3-26
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Violations of children’s rights in Sudan and their circumstances: the current situation and the possibility of solutions
    Autorzy:
    KARAMALLA-GAIBALLA, NAGMELDIN
    Powiązania:
    https://bibliotekanauki.pl/articles/1202990.pdf
    Data publikacji:
    2021-05-15
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Sudan
    Darfur
    children's rights
    child labour
    FGM/C
    underage marriage
    Opis:
    This paper aims to demonstrate the main aspects and weaknesses of children's rights in Sudan and describe how to work towards enhancing the immediate response to violations against children. This discussion will help develop future plans to strengthen the enforcement of children’s rights in Sudan and create an environment that protects children's rights against all kinds of violations. This paper presents the current situation of children’s rights violations in Sudan and factors that have a great and direct impact on these situations, especially social and cultural factors concerning female circumcision, genital mutilation, and marriage of underage girls; and laws that violate the dignity of Sudanese children, such as laws related to flogging, imprisonment, and death. The article also addresses issues of wars and internal conflicts and their impact on children, including their recruitment and trafficking. It also discusses the weaknesses of laws in place to protect children in Sudan and the changes these laws have undergone in recent years, especially the fundamental changes following the revolution that broke out in Sudan in 2018, which replaced the dictatorial military regime with Islamic orientations and trying to find objective solutions.
    Źródło:
    Society Register; 2021, 5, 2; 57-68
    2544-5502
    Pojawia się w:
    Society Register
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-stationary heat transfer in two-phase hollow cylinder with functionally graded effective material properties with second kind of boundary conditions
    Niestacjonarny przepływ ciepła w przewodniku cylindrycznym z warunkami brzegowymi drugiego rodzaju
    Autorzy:
    Ostrowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/395935.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przewodnictwo cieplne
    niestacjonarny przepływ ciepła
    kompozyt
    heat conduction
    FGM
    composite
    Opis:
    The unidirectional non-stationary heat conduction in two-phase hollow cylinder is considered. The conductor is made of two-phase stratified composites and has a smooth gradation of effective properties in the radial direction. Therefore, we deal here with a special case of functionally graded materials, FGM (cf. [6]). The formulation of mathematical model of the conductor is based on the tolerance averaging approach (TAA), cf. [8]. Considerations in this paper are restricted only to the unidirectional nonstationary heat conduction, where on the boundaries are given [phi]-constant or periodic function of heat fluxes q_o = q_o([phi]t), qk = qk([phi]t) for every time period t, and function of initial temperature [...]. The effect of fibres width on the temperature field will be also examined.
    Przedmiotem rozważań niniejszej pracy jest analiza wpływu pewnych parametrów geometrycznych przewodnika na przebieg pola temperatur dla zagadnienia niestacjonarnego przepływu ciepła. Rozpatrywany przewodnik jest dwuskładnikowym kompozytem o deterministycznej mikrostrukturze, który w kierunku kątowym jest .- periodyczny (dla ustalonego promienia .), a w kierunku promieniowym jego efektywne własności zmieniają się w sposób wolnozmienny. Stąd, mamy tutaj do czynienia ze szczególnym przypadkiem materiału o funkcyjnej gradacji własności, FGM (por. Suresh , Mortensen, 1998). Samo zjawisko przewodznia ciepła opisane jest równaniem Fouriera, które zawiera nieciągłe i silnie oscylujące współczynniki. Model matematyczny opisujący zjawisko przewodzenia ciepła w rozpatrywanym kompozycie opierać się będzie na technice tolerancyjnej aproksymacji (por. Woźniak, Wierzbicki, 2000). W pracy ograniczymy się jedynie do przypadku jednowymiarowego przepływu ciepła, w którym na brzegach przewodnika dana jest stała bądź periodyczna funkcja gęstości strumienia ciepła q0 = q0(.,t), qk = qk(.,t) dla dowolnej chwili czasu t, oraz funkcja pola temperatury .0 = .0(.,t) w chwili początkowej t = t0. Rozpatrywano również wpływ szerokości inkluzji na prędkość zmian pola temperatury w obszarze przewodnika.
    Źródło:
    Civil and Environmental Engineering Reports; 2010, 5; 113-122
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zagadnienie zakrzywionej anizotropowej oraz funkcjonalnie gradowanej powłoki poddanej działaniu pola temperatury
    Problem of curvilinear anisotropic and functionally gradated coating subjected to temperature field
    Autorzy:
    Szubartowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/194916.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    materiał funkcjonalnie gradientowy
    termosprężystość
    FGM
    functional gradient material
    thermo-elasticity
    Opis:
    Praca dotyczy problematyki zakrzywionej powłoki wykonanej z anizotropowego materiału o funkcyjnej gradacji. W rachunku wykorzystano koncepcję tensora krzywizny Riemanna-Christoffela wzbogaconą o wpływ pola temperatury przez obecność tensora właściwości termicznych. W ramach wykonanych obliczeń różnica wektora poddanego koneksji afinicznej wzdłuż infinitezymalnego czworokąta wyraża się, zależnie od drogi przejścia, sumą zarówno efektu geometrycznego, reprezentowanego tensorem krzywizny Riemanna-Christoffela, jak również efektu termicznego wyrażonego przez symbol krzywizny termicznej.
    This work concerns the problem of a curvilinear shell made of anisotropic material with functional gradation. The calculus is based on the concept of the Riemann-Christoffel curvature tensor enhanced by the influence of temperature field through the presence of a thermal tensor. Calculations comprise estimation of the difference of a vector subjected to the affine connection along the infinitesimal quadrangle expressed, correspondingly to the shifting path, by a sum of both the geometric effect, represented by the Riemann-Christoffel curvature tensor, as well as certain symbol of the thermal curvature.
    Źródło:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2018, z. 90 [298], 2; 237-244
    0209-2689
    2300-5211
    Pojawia się w:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Analysis of Sintered Gradient Materials Based on Distaloy SE Powder
    Autorzy:
    Zarębski, K.
    Nykiel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355387.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    functionally graded materials (FGM)
    powder metallurgy (PM)
    low-alloy steels
    Opis:
    The study describes the microstructural analysis of cylindrically-shaped functionally graded products sintered from iron powder with scheduled graded structure on the cross-section running from the core to the surface layer of the sinter. Different types of structure were produced using Distaloy SE powder in two compositions - one without the addition of carbon, and another with 0.6wt% C. Two methods were used to fill the die cavity and shape the products. The first method involving a two-step compaction of individual layers. The second method using an original technique of die filling enabled the formation of transition zone between the outer layer and the core still at the stage of product shaping. As part of microstructural analysis, structural constituents were identified and voids morphology was examined. Studies covered the effect of the type of the applied method on properties of the graded zone obtained in the manufactured products.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 613-620
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manufacturing of ZrO2-Ni graded composites via centrifugal casting in the magnetic field
    Autorzy:
    Wachowski, M.
    Kosturek, R.
    Winkler, H.
    Miazga, A.
    Lada, P.
    Kaszuwara, W.
    Konopka, K.
    Zygmuntowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200807.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ZrO2-Ni
    ceramic matrix composites
    FGM
    microstructure
    magnetic field
    Opis:
    The paper presents the possibility of fabricating ceramic-metal composites by an innovative method of centrifugal slip casting in the magnetic field. It was examined whether the use of this method would allow obtaining a gradient concentration of metal particles in the ceramic matrix. In the applied technique, the horizontal rotation axis was used. The study investigated the effect of solid phase content on the properties and microstructure of the products. Water-based suspensions with 35, 40, 45 and 50 vol.% of solid-phase content were prepared with 10 vol.% additional of nickel powder. The viscosity of prepared slurries was considered. The gradient distribution of nickel particles in the zirconia matrix was observed on SEM. Vickers hardness of ZrO2-Ni composites has been measured. The research revealed that the physical properties depend on the volume fraction of solid content and increase as the volume of solid content increases.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 539-545
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of non-linear free vibration of FGM nano-beams based on the conformable fractional non-local model
    Autorzy:
    Rahimi, Z.
    Sumelka, W.
    Shafiei, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/201202.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FGM nano beam
    nonlinear free vibration
    fractional calculus
    integer stress
    non-integer stress
    gradient’s order
    fractional non-local model
    rachunek różniczkowy
    FGM
    drgania swobodne
    Opis:
    Continuum models generalized by fractional calculus are used in different mechanical problems. In this paper, by using the conformable fractional derivative (CFD) definition, a general form of Eringen non-local theory as a fractional non-local model (FNM) is formulated. It is then used to study the non-linear free vibration of a functional graded material (FGM) nano-beam in the presence of von-Kármán non-linearity. A numerical solution is obtained via Galerkin and multiple scale methods and effects of the integer and non-integer (fractional) order of stress gradient (in the non-local stress-strain relation) on the ratio of the non-local non-linear natural frequency to classical non-linear natural frequency of simply-supported (S-S) and clamped-free (C-F) FGM nano-beams are presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 737-745
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some aspects of dynamic coupled response of functionally graded thin-walled columns with square cross-sections under in-plane pulse compression
    Autorzy:
    Kołakowski, Z.
    Teter, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/279439.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    FGM
    dynamic response
    interactive buckling
    thin-walled structures
    compression
    pulse load
    Opis:
    The present paper deals with a dynamic coupled response of functionally graded columns with a quadratic cross-section subjected to an in-plane pulse loading. An Al-TiC metal- -ceramic material is applied. It is assumed that functionally graded materials (FGMs) are subject to Hooke’s law. The thin-walled structures are simply supported at the ends. This study is devoted to the stability problem of rectangular dynamic pulse load. The effects of temperature, wave propagation and damping are neglected. In order to obtain the equations of motion of individual plates, the classic laminate plate theory (CLPT) has been modified in such a way that it additionally accounts for all components of inertial forces. A plate model is adopted for the structures. The problem of an interaction of the global mode with the local ones is concerned (i.e., a three-modes approach). Attention has been focused on some unexpected aspects related to dynamic interactive buckling of columns having two axes of the cross-section symmetry. In the present study, a new approach to the description of this phenomenon, based on Koiter’s theory, has been applied.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 449-462
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of the mechanical behaviour and damage of fgm bent pipes under internal pressure and combined bending moment
    Autorzy:
    Houari, Amin
    Madani, Kouider
    Amroune, Salah
    Zouambi, Leila
    Elajrami, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/2233650.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    FGM
    ceramic metals
    elbow pipe
    internal pressure
    bending moment
    MMU technique
    Opis:
    The main objective of this work is the numerical prediction of the mechanical behaviour up to the damage of the bends of the functionally graded material (FGM) type ceramic/metal pipes. Firstly, the effective elastoplastic proper-ties of bent FGM pipes were determined using the homogenisation law by the Mori–Tanaka models for the elastic part and TTO (Tamura-Tomota-Ozawa) for the plastic part based on a rule of mixtures per function in the form of a power law. Our work also aims at the use of a meshing method (UMM) to predict the behaviour of the FGM by finite element in the mesh of the model. The analysis was performed using the UMM technique for different loading cases and volume fraction distribution. Two stages are necessary for the analysis of the damage: the first is the model of initiation of the damage established by the criterion of maximum deformation named MAXPE and the second is criterion of the energy of the rupture according to the theory Hillerborg used to determine damage evolution. Both stages involve a 3D finite element method analysis. However, for damage, the XFEM technique was used in our UMM method to predict crack initiation and propagation in FGM pipe bends. The results of the numerical analysis concerning the mechanical behavior showed, that if the nature of the bent pipes is in FGM, a good reduction of the various stresses compared to those where the nature of the pipe is metallic material. The results were presented in the form of a force–displacement curve. The validation of the proposed numerical methodology is highlighted by comparisons of current results with results from the literature, which showed good agreement. The analysis took into account the effect of the main parameters in a bent FGM pipe under internal pressure and bending moment on the variation of the force–strain curves.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 3; 460--468
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic solution of pressurized clamped-clamped thick cylindrical shells made of functionally graded materials
    Autorzy:
    Ghannad, M.
    Nejad, M. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/949147.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    clamped-clamped thick cylinder
    functionally graded material (FGM)
    shear deformation theory (SDT)
    Opis:
    The effect of material inhomogeneity on displacements and stresses of an internally pressurized clamped-clamped thick hollow cylinder made of functionally graded materials is investigated. The modulus of elasticity is graded along the radial direction according to power functions of the radial direction. It is assumed that Poisson’s ratio is constant across the cylinder thickness. The governing differential equations were generally derived, making use of the first-order shear deformation theory (FSDT). Following that, the set of non-homogenous linear differential equations for the cylinder with clamped-clamped ends was solved, and the effect of loading and supports on the stresses and displacements was investigated. The problem was also solved, using the finite element method (FEM), the results of which were compared with those of the analytical method.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 1067-1079
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of material gradient on the static and dynamic response of layered functionally graded material plate using finite element method
    Autorzy:
    Vasiraja, N.
    Nagaraj, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/201107.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FGM plate
    finite element
    power law index
    buckling load
    fundamental frequency
    ANSYS®
    Opis:
    This article focuses on the finite element analysis (FEA) of the nonlinear behavior of a layered functionally graded material (FGM) plate as concerns displacement, stresses, critical buckling load and fundamental frequency. The material properties of each layer in an FGM plate are assessed according to a ceramic based simple power law distribution and the rules of mixture. The finite element model of a layered FGM plate is developed using ANSYS®15.0 software. The developed finite element model is used to study the static and dynamic responses of an FGM plate. In this paper, the effects of power law distribution, thickness ratio, aspect ratio and boundary conditions are investigated for central displacement, transverse shear stress, transverse normal stress, critical buckling load and fundamental frequency, and the obtained FEA results are in sound agreement with the literature test data results. Since the FGM is used in a high temperature environment, the FE analysis is performed for the FGM plate under a thermal field and then correlated. Finally, the FGM plate is analyzed under a thermomechanical load by using the current FE concept.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 4; 827-838
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influences of porosity and tangential edge constraint on thermo-torsional postbuckling of FGM toroidal shell segments surrounded by an elastic medium
    Autorzy:
    Nhu Trang, L. T.
    Van Tung, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/38697106.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    nonlinear buckling
    porous FGM
    toroidal shell segment
    tangential edge constraint
    torsional load
    Opis:
    For the first time, simultaneous influences of porosities, tangential constraints of boundary edges, surrounding elastic media and elevated temperature on the buckling and postbuckling behaviors of a functionally graded toroidal shell segment are investigated in this paper. Porosities exist in the functionally graded material (FGM) according to even and uneven distributions. Properties of constituent materials are assumed to be temperature dependent and effective properties of the porous FGM are determined using a modified rule of mixture. Governing equations are based on the classical shell theory taking into account geometrical nonlinearity and interactive pressure from surrounding elastic medium. Multi-term analytical solutions are assumed to satisfy simply supported boundary conditions and the Galerkin method is adopted to derive nonlinear load – deflection relations and buckling loads. Parametric studies are carried out to analyze the effects of porosity, shell geometry, degree of tangential edge constraint, elevated temperature and elastic media on the buckling resistance and postbuckling strength of toroidal shell segments under a torsional load. The study reveals that tangential edge restraints have considerably beneficial and detrimental influences on the nonlinear stability of torsion-loaded FGM shells at room and elevated temperatures, respectively. The results also find out that the shear layer and the elastic layer of surrounding medium significantly enhances and alleviates the buckling resistance capacity and severity of the snap-through response of the torsion-loaded porous FGM toroidal shell segment, respectively.
    Źródło:
    Archives of Mechanics; 2023, 75, 4; 401-429
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of thermal shock of FGMS disks
    Symulacja numeryczna szoku termicznego dysków gradientowych
    Autorzy:
    Niezgoda, T.
    Boniecki, M.
    Kosiuczenko, K.
    Barnat, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/246450.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    MES (metoda elementów skończonych)
    materiały gradientowe
    szok termiczny
    naprężenia
    FEM
    FGM
    stress
    thermal shock
    Opis:
    Praca zawiera opis symulacji numerycznej szoku termicznego w cylindrycznych próbkach kompozytowych o zróżnicowanej grubości. Próbki wykonano z materiałów gradientowych na bazie aluminy Al2O3, z warstwami o zróżnicowanej zawartości cyrkonii zro2 w każdej warstwie. W celu przeprowadzenia oceny otrzymanych wyników numerycznych wykonano eksperyment. Wykorzystywane w obliczeniach parametry materiałowe obliczono w oparciu o wzory zaczerpnięte z teorii mieszanin. Symulację przeprowadzono wykorzystując metodę elementów skończonych zaimplementowaną w programie LS-Dyna. Modele numeryczne symulacji składały się z siatki elementów bryłowych 6 i 8-węzłowych z 3 stopniami swobody w każdym węźle, opisującej 5-stopniowy wycinek krążka. Odpowiedni sposób zdefiniowania warunków brzegowych umożliwił zmniejszenie wielkości zadania numerycznego poprzez wykorzystanie osiowej symetrii Otrzymane wyniki symulacji numerycznej pozwalają ocenić poziom naprężeń w materiale gradientowym poddanym szokowi termicznemu. Pozwalają na świadome kształtowanie odporności termicznej barier cieplnych, nie tylko modyfikując ich grubość, ale również skład chemiczny warstw. Zestawienie wyników symulacji numerycznej i eksperymentu pokazuje niewielkie różnice w przebiegach wykresów temperatur, co świadczy o poprawności zamodelowania zjawiska.
    The paper presents a description of the numerical simulation of the thermal shock in cylindrical composite specimens of diversified thickness. The specimens were made of graded materials (Al2O3 with various admixture of ZrO2). The material parameters used in numerical calculations were calculated on the grounds of the mixture method. The simulation was carried out using the Finite Element Method implemented in the LS-Dyna code. The results of numerical calculations were verified experimentally. The aim of the paper is theoretical modelling of the thermal shock problem in a strip made of functionally graded composite (FGMs). The distributions of thermal are analyzed respectively by thermo-mechanical finite element analysis (FEA). The propagation of stress in fgms is studied numerically by means of the LS Dyna code. The numerical simulation demonstrates the applicability of the algorithm to the modeling of FGM without any averaging procedure. The thermal shock resistance of disks (780 centigrade) was evaluated by sudden cooling with a high-velocity nitrogen jet at room temperature (20 centigrade).
    Źródło:
    Journal of KONES; 2007, 14, 3; 459-465
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transient analysis of transversely functionally graded Timoshenko beam (TFGTB) in conjunction with finite element method
    Autorzy:
    Khafaji, Salwan Obaid Waheed
    Al-Shujairi, Mohammed A.
    Aubad, Mohammed Jawad
    Powiązania:
    https://bibliotekanauki.pl/articles/140231.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FGM beam
    transient response
    free vibration
    fundamental frequency
    finite element method
    Timoshenko beam theory
    Opis:
    In this work, transient and free vibration analyses are illustrated for a functionally graded Timoshenko beam (FGM) using finite element method. The governing equilibrium equations and boundary conditions (B-Cs) are derived according to the principle of Hamilton. The materials constituents of the FG beam that vary smoothly along the thickness of the beam (along beam thickness) are evaluated using the rule of mixture method. Power law index, slenderness ratio, modulus of elasticity ratio, and boundary conditions effect of the cantilever and simply supported beams on the dynamic response of the beam are studied. Moreover, the influence of mass distribution and continuous stiffness of the FGM beam are deeply investigated. Comparisons between the current free vibration results (fundamental frequency) and other available studies are performed to check the formulation of the current mathematical model. Good results have been obtained. A significant effect is noticed in the transient response of both simply supported and cantilever beams at the smaller values of the power index and the modulus elasticity ratio.
    Źródło:
    Archive of Mechanical Engineering; 2020, LXVII, 3; 299-321
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exact and Numerical Elastic Analysis for the FGM Thick-Walled Cylindrical Pressure Vessels with Exponentially-Varying Properties
    Autorzy:
    Nejad, M. Z.
    Abedi, M.
    Lotfian, M. H.
    Ghannad, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355232.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cylindrical pressure vessel
    thick-walled
    Functionally Graded Material (FGM)
    Finite element method (FEM)
    exponential
    Opis:
    Assuming exponential-varying properties in the radial direction and based on the elasticity theory, an exact closed-form analytical solution is obtained to elastic analysis of FGM thick-walled cylindrical pressure vessels in the plane strain condition. Following this, radial distribution of radial displacement, radial stress, and circumferential stress are plotted for different values of material inhomogeneity constant. The displacements and stresses distributions are compared with the solutions of the finite element method (FEM).
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1649-1654
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the stress free deformation of linear FGM interface under constant temperature
    Autorzy:
    Ganczarski, A.
    Szubartowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/386659.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    linear FGM interface
    stress free deformation
    constant temperature
    functionally graded material
    odkształcenia
    blacha gruba
    tworzywa gradientowe
    Opis:
    This paper demonstrates the stress free thermo-elastic problem of the FGM thick plate. Existence of such a purely thermal deformation is proved in two ways. First proof is based on application of the Iljushin thermo-elastic potential to displacement type system of equations. This reduces 3D problem to the plane stress state problem. Next it is shown that the unique solution fulfils conditions of simultaneous constant temperature and linear gradation of thermal expansion coefficient. Second proof is based directly on stress type system of equations which straightforwardly reduces to compatibility equations for purely thermal deformation. This occurs if only stress field is homogeneous in domain and at boundary. Finally an example of application to an engineering problem is presented.
    Źródło:
    Acta Mechanica et Automatica; 2015, 9, 3; 135-139
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural analysis of functionally graded material using sigmioadal and power law
    Autorzy:
    Abd-Ali, Nabel Kadum
    Madeh, Ahmed Raee
    Powiązania:
    https://bibliotekanauki.pl/articles/1955209.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    FGM shell
    sigmoidal law
    power law
    Hamilton’s principle
    stress analysis
    prawo sigmoidalne
    zasada Hamiltona
    analiza naprężeń
    Opis:
    The stress-strain relations, displacement distribution, stress resultants and mid plane strain resultants of a functionally graded material plate are studied using Hamilton’s principle. A simply supported rectangular thick shell direct stress, inplane shear stress, transverse stress and displacement are investigated. The analysis and modeling of five layers FGM shell is carried out using MATLAB19 code with ABAQUS20 software. Using distinct materials on the top and bottom layers of the shell, a transverse uniform load in five degrees - of - freedom is applied with a specific Poisson's ratio and Young's modulus in a power and sigmoidal law function through the thickness direction. A power law was used to determine the distribution of properties through shell thickness. The results showed that the bottom layer affected significantly most stress due to subjected to the most in-plane stress while the displacement is greatest at the top layer.
    Źródło:
    Diagnostyka; 2021, 22, 4; 59-65
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An investigation of stresses and deformation states of clamped rotating functionally graded disks
    Autorzy:
    Thawait, A. K.
    Sondhi, L.
    Sanyal, S.
    Bhowmick, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/281806.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    functionally graded material (FGM)
    linear elastic analysis
    annular rotating disk
    variable thickness rotating disk
    finite element method (FEM)
    Opis:
    The present study deals with the linear elastic analysis of variable thickness rotating disks made of functionally graded materials (FGMs) by the finite element method. The disks have radially varying material properties according to an exponential law, which is achieved by the element based grading of the material properties on the meshed domain. The results are reported for three types of thickness profiles, namely, uniform, linearly varying and concave thickness, having their mass constant. The disks are subjected to the clamped boundary condition at the inner surface and the free boundary condition at the outer surface. The obtained results show that in a variable thickness rotating disk, deformation and stresses are less as compared to the uniform thickness disk.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 189-198
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static analysis of functionally graded plate using nonlinear classical plate theory with von-Karman strains
    Autorzy:
    Singh, S. J.
    Harsha, S. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/265766.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    metoda Naviera
    teoria płyt
    odkształcenie
    functionally graded materials (FGM) plate
    Von-Karman strain
    nonlinear classical plate theory (NLCPT)
    Navier’s method
    Opis:
    The present study is based on the nonlinear bending analysis of an FGM plate with Von-Karman strain based on the non-linear classical plate theory (NLCPT) with in-plane displacement and moderate rotation. Non-linear bending analysis based on stresses and transverse deflections is then carried out for the plate for the complex solution obtained using an analytical method viz. Navier’s method. The equations of motion and boundary conditions are obtained using the Principle of Minimum Potential Energy (PMPE) method and material property is graded in thickness direction according to simple power-law distribution in terms of volume fractions of the constituents. The effect of the span-to-thickness ratio and FGM exponent on the maximum central deflection and stresses are studied. The results show that the response is transitional with respect to ceramic and metal and the complex solution predicts the real behavior of stresses and deflections in the functionally graded plate. The functionally graded plate is found to be more effective for moderately thick and thick plates, which is inferred by a complex nature of the solution. For FGM plates, the transverse deflection is in-between to that of metal and ceramic rich plates. The complex nature of the solution also gives information about the stress distribution in the thickness direction.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 707-726
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local nonsymmetrical postbuckling equilibrium path of the thin FGM plate
    Niesymetryczna lokalna ścieżka równowagi pokrytycznej cienkiej płyty z materiału funkcjonalnie gradientowego
    Autorzy:
    Kolakowski, Z.
    Mania, R. J.
    Grudziecki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/301161.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    FGM
    FEM
    Koiter’s theory
    semi-analytical method
    post-buckling path
    materiały funkcjonalnie gradientowe
    MES
    teoria Koitera
    metoda pól-analityczna
    ścieżka pokrytyczna
    Opis:
    The influence of the imperfection sign (sense) on local postbuckling equilibrium path of plates made of functionally graded materials (FGMs) has been analyzed. Koiter’s theory has been used to explain this phenomenon. In the case of local buckling, a nonsymmetrical stable equilibrium path has been obtained. The investigations focus on a comparison of the semi-analytical method (SAM) and the finite element method (FEM) applied to the postbuckling nonlinear analysis of thin-walled complex FG plated structures.
    W pracy przedstawiono analizę wpływu znaku imperfekcji wstępnej na charakterystykę lokalnej pokrytycznej ścieżki równowagi płyty wykonanej z materiału gradientowego. Do wyjaśnienia tego efektu zastosowano teorię Koitera. W przypadku lokalnej utraty stateczności uzyskano niesymetryczne stateczne ścieżki równowagi. Prezentowane badania były skoncentrowane na porównaniu wyników uzyskanych na podstawie własnej metody pół-analitycznej z wynikami uzyskanymi przy zastosowaniu metody elementów skończonych w nieliniowej analizie cienkościennych konstrukcji płytowych wykonanych z materiałów gradientowych.
    Źródło:
    Eksploatacja i Niezawodność; 2015, 17, 1; 135-142
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wear resistance of piston sleeve made of layered material structure: MMC A356R, anti-abrasion layer and FGM interface
    Autorzy:
    Hernik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/387577.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    piston sleeve
    wear
    thermo-elasticity
    Archard's law
    Metal Matrix Composite
    MMC
    Functionally Graded Material
    FGM
    odporność na zużycie
    termosprężystość
    prawo Archarda
    tuleja tłoka
    stal nierdzewna
    Opis:
    The aim of this paper is the numerical analysis of the one of main part of car engine – piston sleeve. The first example is for piston sleeve made of metal matrix composite (MMC) A356R. The second improved material structure is layered. Both of them are comparison to the classical structure of piston sleeve made of Cr-Ni stainless steel. The layered material structure contains the anti-abrasion layer at the inner surface of piston sleeve, where the contact and friction is highest, FGM (functionally graded material) interface and the layer of virgin material on the outer surface made of A356R. The complex thermo-elastic model with Archard's condition as a wear law is proposed. The piston sleeve is modelling as a thin walled cylindrical axisymmetric shell. The coupled between the formulation of thermoelasticity of cylindrical axisymmetric shell and the Archard’s law with functionally changes of local hardness is proposed.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 3; 207-212
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic solutions based on the Mori-Tanaka scheme for pressurized functionally graded cylinder
    Autorzy:
    Eker, Mehmet
    Yarımpabuç, Durmu
    Yıldırım, Ali
    Çelebi, Kerimcan
    Powiązania:
    https://bibliotekanauki.pl/articles/1839733.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    FGM
    functional gradient material
    pseudospectral Chebyshev method
    Mori-Tanaka homogenization
    cylindrical pressure vessel
    materiał funkcjonalnie gradientowy
    cylindryczny zbiornik ciśnieniowy
    pseudospektralna metoda Czebyszewa
    metoda Czebyszewa
    homogenizacja Mori-Tanaka
    Opis:
    In this paper, an elastic analysis of a thick-walled functionally graded cylinder subjected to internal pressure is examined. Material properties for the isotropic material are estimated to obey the Mori-Tanaka homogenization scheme through the thickness. The resulting two-point irregular boundary value problem is solved by the pseudospectral Chebyshev method that converts the boundary value problem to the system of equations, which can be solved by any appropriate decomposition method. Benchmark solutions are used to validate the method. The effect of the arbitrarily chosen volume fraction index is demonstrated for stress and displacement distributions. The effective stresses for different inner radius and volume fraction index are also discussed.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 4; 57-68
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic solutions based on the Mori-Tanaka scheme for pressurized functionally graded cylinder
    Autorzy:
    Eker, Mehmet
    Yarımpabuç, Durmu
    Yıldırım, Ali
    Çelebi, Kerimcan
    Powiązania:
    https://bibliotekanauki.pl/articles/1839749.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    FGM
    functional gradient material
    pseudospectral Chebyshev method
    Mori-Tanaka homogenization
    cylindrical pressure vessel
    materiał funkcjonalnie gradientowy
    cylindryczny zbiornik ciśnieniowy
    pseudospektralna metoda Czebyszewa
    metoda Czebyszewa
    homogenizacja Mori-Tanaka
    Opis:
    In this paper, an elastic analysis of a thick-walled functionally graded cylinder subjected to internal pressure is examined. Material properties for the isotropic material are estimated to obey the Mori-Tanaka homogenization scheme through the thickness. The resulting two-point irregular boundary value problem is solved by the pseudospectral Chebyshev method that converts the boundary value problem to the system of equations, which can be solved by any appropriate decomposition method. Benchmark solutions are used to validate the method. The effect of the arbitrarily chosen volume fraction index is demonstrated for stress and displacement distributions. The effective stresses for different inner radius and volume fraction index are also discussed.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 4; 57-68
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-36 z 36

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