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Wyszukujesz frazę "phase lags" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Two-temperature theory for a heated semi-infinite solid by a pulsed laser radiation
    Autorzy:
    Zenkour, Ashraf M.
    Abouelregal, Ahmed E.
    Powiązania:
    https://bibliotekanauki.pl/articles/240137.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelasticity
    two-temperature
    non-Gaussian laser pulse
    laser intensity
    phase lags
    Opis:
    In this paper, the two-temperature thermoelasticity model is proposed to a specific problem of a thermoelastic semi-infinite solid. The bounding plane surface of the semi-infinite solid is considered to be under a non-Gaussian laser pulse. Generalized thermoelasticity analysis with dual-phase-lags is taken into account to solve the present problem. Laplace transform and its inversion techniques are applied and an analytical solution as well as its numerical outputs of the field variables are obtained. The coupled theory and other generalized theory with one relaxation time may be derived as special cases. Comparison examples have been made to show the effect of dual-phase-lags, temperature discrepancy, laser-pulse and laser intensity parameters on all felids. An additional comparison is also made with the theory of thermoelasticity at a single temperature.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 2; 85-101
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Refined multi-phase-lags theory and Thomson effect on a micropolar thermoelastic medium with voids
    Autorzy:
    Alharbi, Amnah M.
    Abd-Elaziz, Elsayed M.
    Othman, Mohamed I.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955005.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micropolar
    voids
    refined-phase-lags theory
    thomson effect
    normal mode
    analysis
    Opis:
    The problem considered is that of an isotropic, micropolar thermoelastic medium with voids subjected to the Thomson effect. The solution to the problem is presented in the context of the refined multiphase-lags theory of thermoelasticity. The normal mode analysis was used to obtain the analytical expressions of the considered variables. The nondimensional displacement, temperature, microrotation, the change in the volume fraction field and stress of the material are obtained and illustrated graphically. The variations of these quantities have been depicted graphically in the refined-phase-lag theory, Green and Naghdi theory of type II, Lord and Shulman theory and a coupled theory. The effects of the Thomson parameter and phase lag parameters on a homogeneous, isotropic, micropolar thermoelastic material with voids are revealed and discussed. Some particular cases of interest are deduced from the present investigation.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 3; 279--309
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Memory response on generalized thermoelastic medium in context of dual phase lag thermoelasticity with non-local effect
    Autorzy:
    Tiwari, R.
    Saeed, A. M.
    Kumar, R.
    Kumar, A.
    Singhal, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/38694222.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    memory dependent derivative
    time-delay
    kernel function
    non-local
    continuum theory
    dual phase lags
    Opis:
    Theory of non-local continuum is contemporary appraised and is found to be supplementary coherent to capture the impacts of each and every point of the material at its single point. The conviction of memory dependent derivative is also newly appraised and is observed to be more intuitionistic for predicting the realistic character of the real-world obstacles. Attractiveness of the belief of a memory dependent derivative lies in its unique properties such as its significant constituents – a kernel function and time-delay are freely selected according to the requirement of a problem. The present study comprises a new meticulous thermoelastic heat conduction model for the homogeneous, isotropic, thermoelastic half space medium concerning memory effects and non-local effects. Governing equations are constructed on the basis of the newly appraised non-local generalized theory of thermoelasticity with two phase lags in the frame of a memory dependent derivative. Exact analytical solutions of the physical fields such as dimensionless temperature, displacement as well as thermal stress are evaluated by using a suitable technique of the Laplace transform. Quantitative results are determined in a time-domain for different values of time by taking the numerical inversion of the Laplace transform. Noteworthy role of the constituents of the memory dependent derivative such as kernel function as well as time-delay factor has been scrutinized on the crucial field variables of the medium through computational outcomes. Moreover, the impact of non-local parameter is examined on the variations of field quantities through the quantitative results.
    Źródło:
    Archives of Mechanics; 2022, 74, 2-3; 69-88
    0373-2029
    Pojawia się w:
    Archives of 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:
    The effect of pulsed laser radiation on a thermoviscoelastic semi-infinite solid under two-temperature theory
    Autorzy:
    Othman, M. I.
    Abouelregal, A. E. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/240353.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    generalized thermo-visco-elasticity
    two-temperature
    Non-Gaussian laser pulse
    laser intensity
    phase lags
    Kelvin-Voigt model
    termolepkosprężystość
    dwustopniowy
    niegaussowski impuls laserowy
    intensywność lasera
    model Kelvina-Voigta
    Opis:
    The purpose of this paper is to study the thermoviscoelastic interactions in a homogeneous, isotropic semi-infinite solid under two-temperature theory with heat source. The Kelvin-Voigt model of linear viscoelasticity which describes the viscoelastic nature of the material is used. The bounding plane surface of the medium is subjected to a non-Gaussian laser pulse. The generalized thermoelasticity theory with dual phase lags model is used to solve this problem. Laplace transform technique is used to obtain the general solution for a suitable set of boundary conditions. Some comparisons have been shown in figures to estimate the effects of the phase lags, viscosity, temperature discrepancy, laser-pulse and the laser intensity parameters on all the studied fields. A comparison was also made with the results obtained in the case of one temperature thermoelasticity theory.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 3; 77-99
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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