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Wyszukujesz frazę "Zenkour, A. M." wg kryterium: Autor

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    Wyświetlanie 1-11 z 11
    Tytuł:
    Trigonometric solution for an exponentially graded thick plate resting on elastic foundations
    Autorzy:
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/139868.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    trigonometric plate theory TPT
    exponentially graded plate
    elastic foundation
    teoria tablic trygonometrycznych TPT
    płyta EG
    podstawa elastyczna
    Opis:
    This article investigates the solution of exponentially graded (EG) thick rectangular plates resting on two-parameter elastic foundations according to a trigonometric plate theory (TPT). This theory includes the effect of both shear and normal strains thickness without needing to any shear correction factor. The displacement fields contains initial terms of a power series across plate thickness as well as additional trigonometric terms. The material properties of plate is graded such that Lamé’s coefficients convert exponentially in a given constant orientation.Equilibrium equations according to the EG plate resting on Pasternak’s foundations are derived. The solution is obtained by using Navier’s technique. Numerical results for the EG thick plate on elastic foundations are presented, and compared with those available in the literature. The influences of Winkler’s and Pasternak’s parameters, side-to-thickness ratio, inhomogeneity parameter and aspect ratio on the bending responses of EG plates are investigated.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 2; 193-208
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified Couple Stress Theory for Micro-Machined Beam Resonators with Linearly Varying Thickness and Various Boundary Conditions
    Autorzy:
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/139912.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microbeam
    temperature dependent properties
    modified couple stress analysis
    linear varying thickness
    mikrowiązka
    właściwości zależne od temperatury
    zmodyfikowana analiza naprężeń momentowych
    liniowo zmienna grubość
    Opis:
    This article employs the classical Euler–Bernoulli beam theory in connection with Green–Naghdi’s generalized thermoelasticity theory without energy dissipation to investigate the vibrating microbeam. The microbeam is considered with linearly varying thickness and subjected to various boundary conditions. The heat and motion equations are obtained using the modified couple stress analysis in terms of deflection with only one material length-scale parameter to capture the size-dependent behavior. Various combinations of free, simply-supported, and clamped boundary conditions are presented. The effect of length-to-thickness ratio, as well as the influence of both couple stress parameter and thermoelastic coupling, are all discussed. Furthermore, the effect of reference temperature on the eigenfrequency is also investigated. The vibration frequencies indicate that the tapered microbeam modeled by modified couple stress analysis causes more responses than that modeled by classical continuum beam theory, even the thermoelastic coupled is taken into account.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 1; 43-64
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A generalized thermoelastic dual-phase-lagging response of thick beams subjected to harmonically varying heat and pressure
    Autorzy:
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/949122.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    thermoelasticity
    dual-phase-lag model
    two-dimensional elasticity solution
    Opis:
    The generalized thermoelastic problem of a thermo-mechanically loaded beam is studied. The upper surface of the beam is thermally isolated and subjected to a mechanical load while the bottom surface is traction free and subjected to a heating source. Based on the heat conduction equation containing the thermoelastic coupling term and the two-dimensional elasticity theory, thermoelastic coupling differential equations of motion are established. The generalized thermoelasticity theory with the dual-phase-laggings (DPLs) model is used to solve this problem. A closed-form analytical technique is used to calculate vibration of displacements and temperature. The effects of the phase-laggings (PLs), the intensity of the applied load and heat parameters on the field quantities of the beam are discussed. The variation along the axial direction and through-the-thickness distributions of all fields are investigated. Some comparisons have been also shown graphically to estimate the effects of the time on all the studied fields.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 15-30
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermo-diffusion of a thick circular plate via modified Green–Naghdi models
    Autorzy:
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/38600460.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    thermal diffusion
    chemical potential
    multi-dual-phase-lag
    Green and Naghdi II III
    Opis:
    This article presents the thermo-diffusion of an isotropic thick circular plate. The Green and Naghdi’s models including the energy dissipation are anticipated in their simple forms. Novel multi single/dual-phase-lag models with higher-order timederivatives are also provided to examine the thermo-diffusion response of the circular plate. The simple and refined forms of Green and Naghdi’s types II and III are investigated in this work. The closed-form solution of thermal diffusion governing equations is attained by taking into account the boundary conditions. A validation examples of outcomes are acceptable by comparing all quantities according to the discussing of all thermoelastic models. The refined forms of Green and Naghdi’s types II and III should be applied to get accurate outcomes.
    Źródło:
    Archives of Mechanics; 2020, 72, 3; 235-256
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelastic response of nanobeam resonators subjected to exponential decaying time varying load
    Autorzy:
    Abouelregal, A. E.
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/949293.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    thermoelasticity
    nonlocal nanobeam
    varying load
    ramp-type heating
    Opis:
    This work investigates the vibrational response of thermoelastic nanobeam resonators induced by ramp-type heating and subjected to exponential decaying time varying load via Euler-Bernoulli beam theory. Governing equations are derived in the context of nonlocal generalized thermoelasticity theory with dual phase lags. The nonlocal nanobeam theory incorporates a nonlocal parameter to capture the small scale effect. Using the Laplace transform technique, an analytical solution has been attained. and inversions of the transformed solutions have been carried out by means of calculus of residues. The effects of nonlocal, point load and ramping-time parameters on all studied fields of the nanobeam are investigated and discussed.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 937-948
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetothermoelastic vibrations on a viscoelastic microbeam subjected to a laser heat source
    Autorzy:
    Abouelregal, A. E.
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/38614523.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    thermoviscoelasticity
    microbeams
    laser pulse
    magnetic field
    Opis:
    The linear theory of viscoelasticity remains an important field of research like most solids and polymer materials when exposed to a vicious dynamic loading effect. This article introduces a new model for describing the behavior of thermoviscoelastic microbeams considering the effects of temperature change and the longitudinal magnetic field. The governing equations in this model are derived based on the Euler–Bernoulli beam theory, Kelvin–Voigt model of viscosity, the generalized thermoelasticity, and the classical Maxwell equations. The two ends of the microbeam are clamped and subjected to the influence of a laser pulse with a temporal intensity profile. The analytical solutions to the physical fields are evaluated using the Laplace transform and its inversion transforms are performed numerically. The thermo-viscoelastic responses of the microbeam are calculated numerically and investigated graphically. The effect of different parameters such as viscosity, laser intensity, and the magnitude of the magnetic field are studied in detail.
    Źródło:
    Archives of Mechanics; 2021, 73, 1; 3-26
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelastic problem of an axially moving microbeam subjected to an external transverse excitation
    Autorzy:
    Abouelregal, A. E.
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/279181.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    thermoelasticity
    microbeam
    sinusoidal pulse heating
    axially moving
    transverse excitation
    Opis:
    In this study, the problem of an axially moving microbeam subjected to sinusoidal pulse heating and an external transverse excitation is solved. The generalized thermoelasticity theory with one relaxation time is used to solve this problem. An analytical technique based on the Laplace transform is used to calculate the vibration of deflection and the temperature. The inverse of Laplace transforms are computed numerically using Fourier expansion techniques. The effects of the pulse-width of thermal vibration, moving speed and the transverse excitation are studied and discussed on the lateral vibration, temperature, displacement and bending moment of the beam.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 1; 167-178
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generalized thermoelastic interactions due to an inclined load at a two-temperature half-space
    Autorzy:
    Abouelregal, A. E.
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/279661.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    thermoelasticity
    conductive and thermodynamic temperatures
    half-space
    inclined load
    Opis:
    The article presents a two-temperature theory to study the thermally insulated stress-free surface of a thermoelastic solid half-space due to an inclined load. The inclined load is a linear combination of a normal load and a tangential load. The normal mode analysis has been employed to solve the present problem. Variations of conductive and thermodynamic temperatures, displacements, and stresses distributions with the horizontal distance have been presented graphically. Some comparisons have been made to estimate the effects due to the two-temperature parameter and the inclination angle on the field quantities. Results of earlier works have been deduced from the present investigation as special cases.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 827-838
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelastic stresses in functionally graded rotating annular disks with variable thickness
    Autorzy:
    Allam, M. N. M.
    Tantawy, R.
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/949321.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    functionally graded
    variable thickness
    semi-analytical approach
    rotating
    thermal effect
    Opis:
    This article presents semi-analytical solutions for stress distributions in exponentially and functionally graded rotating annular disks with arbitrary thickness variations. The disk is under pressure on its boundary surfaces and exposed to temperature distribution varying linearly across thickness. Material properties are supposed to be graded in the radial direction of the disk and obeying to two different forms of distribution of volume fraction of constituents. Different conditions at boundaries for stresses and displacement are discussed. Accurate and efficient solutions for displacement and stresses in rotating annular disks are determined using infinitesimal theory. Numerical results are carried out and discussed for different cases. It can be deduced that the gradient of material properties and thickness variation as well as the change of temperature sources have a specific effect in modern applications.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1029-1041
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelastic Interactions in a Rotating Infinite Orthotropic Elastic Body with a Cylindrical Hole and Variable Thermal Conductivity
    Autorzy:
    Mashat, D. S.
    Zenkour, A. M.
    Abouelregal, A. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/139602.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelasticity
    phase lags
    rotation
    orthotropic body
    cylindrical hole
    variable thermal conductivity
    termoelastyczność
    opóźnienia fazowe
    obrót
    ciało ortotropowe
    otwór cylindryczny
    zmienna przewodność cieplna
    Opis:
    In the present article, we introduced a new model of the equations of generalized thermoelasticity for unbounded orthotropic body containing a cylindrical cavity. We applied this model in the context of generalized thermoelasticity with phase-lags under the effect of rotation. In this case, the thermal conductivity of the material is considered to be variable. In addition, the cylinder surface is traction free and subjected to a uniform unit step temperature. Using the Laplace transform technique, the distributions of the temperature, displacement, radial stress and hoop stress are determined. A detailed analysis of the effects of rotation, phase-lags and the variability thermal conductivity parameters on the studied fields is discussed. Numerical results for the studied fields are illustrated graphically in the presence and absence of rotation.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 4; 481-498
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic and Viscoelastic Stresses of Nonlinear Rotating Functionally Graded Solid and Annular Disks with Gradually Varying Thickness
    Autorzy:
    Allam, M. N. M.
    Tantawy, R.
    Yousof, A.
    Zenkour, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/139874.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nonlinear rotation
    viscoelasticity
    functionally graded materials
    successive approximations method
    solid and annular disks
    gradually varying thickness
    rotacja nieliniowa
    lepkosprężystość
    funkcjonalne materiały gradientowe
    metoda kolejnych przybliżeń
    dyski pierścieniowe i stałe
    stopniowa zmiana grubości
    Opis:
    Analytical and numerical nonlinear solutions for rotating variable-thickness functionally graded solid and annular disks with viscoelastic orthotropic material properties are presented by using the method of successive approximations.Variable material properties such as Young’s moduli, density and thickness of the disk, are first introduced to obtain the governing equation. As a second step, the method of successive approximations is proposed to get the nonlinear solution of the problem. In the third step, the method of effective moduli is deduced to reduce the problem to the corresponding one of a homogeneous but anisotropic material. The results of viscoelastic stresses and radial displacement are obtained for annular and solid disks of different profiles and graphically illustrated. The calculated results are compared and the effects due to many parameters are discussed.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 4; 423-440
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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