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    Wyświetlanie 1-11 z 11
    Tytuł:
    Study of the effect of composite constrained layers in vibration damping of plates
    Autorzy:
    Sasikumar, K. S. K.
    Selvakumar, S.
    Arulshri, K. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/955317.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    wibracja
    kompozyty
    lepkosprężystość
    vibration
    composite
    viscoelastic
    plates
    Opis:
    To add damping to the system, viscoelastic materials (VEM) are added to structures, in order to enhance damping effects of the VEM, a constraining layer is attached. Due to the addition of the material on the system the fundamental characteristics of the systems are altered much. This paper analyzes the damping effect of the constraining layer on plate type structures numerically using the FEM software ANSYS. Experiments are conducted to validate the analytical results. The use of weightless composite materials as constraining layers has been analyzed. Results are compared with the conventional constraining layer materials. The results showed that composite materials give a better damping effect without much altering the fundamental characteristics.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 203-209
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow of a visco-elastic fluid past a porous plate in a rotating system
    Autorzy:
    Guria, M.
    Jana, R. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/264632.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    lepkosprężystość
    przepływ płynu
    elastyczność
    visco-elastic
    relaxation
    backflow
    elasticity
    Opis:
    An analysis is made on a steady flow of an incompressible visco-elastic fluid (of small memory) past a porous plate subject to uniform suction or blowing. The fluid and the plate rotate in unison with uniform angular velocity about an axis perpendicular to the plate. It is shown that for a visco-elastic fluid of small memory, a boundary layer is formed for uniform suction or blowing at the plate. It is found that the primary velocity increases whereas the secondary velocity increases near the plate and decreases away from the plate with an increase in the elastic parameter. The secondary flow shows flow reversal for a large elastic parameter. It is found that both primary and secondary velocities increase near the plate and decrease away from the plate with an increase in the rotation parameter. It is also found that the shear stress due to primary flow increases with an increase in either the elastic parameter or rotation parameter. On the other hand, the shear stress due to secondary flow decreases with an increase in the elastic parameter while it increases with an increase in the rotation parameter. The temperature distribution in the boundary layer is also determined. It is shown that elasticity leads to an increase in heat transfer at the plate.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 27-41
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of heredity kernels and their influence on the life time of glass/polyester composites
    Autorzy:
    Olodo, E. T.
    Adjovi, E. C.
    Adanhounme, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/955255.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    lepkosprężystość
    parametry sprężyste
    kompozyty
    heredity kernels
    viscoelastic parameters
    lifetime
    Opis:
    One of the major problems encountered in prediction of hereditary viscoelastic behavior of polymeric composites is the determination of heredity kernels. This issue comes down to identification of the model characterizing the viscoelastic properties of these materials. The purpose of this work is to propose a model for prediction of viscoelastic nonlinear behavior of laminate composite with polyester matrix, through the study and analysis of heredity kernels and their influence on the life time of this material. Identification of this model required experimental determination at room temperature, of viscoelastic parameters of heredity kernels by macroscopic approach. These data provide predictive tools for establishment of the life time and long term stress limit under static complex loading for this type of material.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 4; 725-734
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Propagation of waves in the layer of a thermo-viscoelastic transversely isotropic medium
    Autorzy:
    Gupta, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/265026.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    lepkosprężystość
    termosprężystość
    prędkość fazowa
    viscoelastic
    thermoelasticity
    phase velocity transversely isotropic
    Opis:
    The article is presented to enhance our knowledge about the propagation of Lamb waves in the layer of a viscoelastic transversely isotropic medium in the context of thermoelasticity with GN theory of type-II and III. Secular equations for symmetric and skew-symmetric modes of wave propagation in completely separate terms are derived. The amplitudes of displacements and temperature distribution were also obtained. Finally, the numerical solution was carried out for cobalt and the dispersion curves, amplitudes of displacements and temperature distribution for symmetric and skew-symmetric wave modes are presented to evince the effect of anisotropy. Some particular cases are also deduced.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 21-35
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface waves in non-homogeneous, general magnetothermo, viscoelastic media of higher order
    Autorzy:
    Sethi, M.
    Gupta, K. C.
    Rani, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/955273.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fale powierzchniowe
    lepkość
    lepkosprężystość
    inhomogeneous media
    variable density
    surface waves
    viscosity
    Opis:
    The aim of the present paper is to investigate surface waves in a non-homogeneous, isotropic, visco-elastic solid medium of n-th order including the time rate of strain. The theory of generalised surface waves has firstly been developed and then it has been employed to investigate particular cases of waves, viz., Stoneley, Rayleigh and Love type. The wave velocity equations have been obtained for different cases and are in well agreement with the corresponding classical result, when the effects of viscosity, temperature, magnetism as well as nonhomogeneity of the material medium are ignored.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1221-1236
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of slip condition on viscoelastic MHD oscillatory forced convection flow in a vertical channel with heat radiation
    Autorzy:
    Singh, K. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/955264.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    magnetohydrodynamika
    konwekcja wymuszona
    lepkosprężystość
    porowatość
    oscillatory
    MHD
    forced convection
    viscoelastic
    slip flow
    porous medium
    Opis:
    In this paper an oscillatory flow of a viscoelastic, incompressible and electrically conducting fluid through a porous medium bounded by two infinite vertical parallel plates is discussed. One of these plates is subjected to a slip-flow condition and the other to a no-slip condition. The pressure gradient in the channel oscillates with time. A magnetic field of uniform strength is applied in the direction perpendicular to the plates. The induced magnetic field is neglected due to the assumption of a small magnetic Reynolds number. The temperature difference of the two plates is also assumed high enough to induce heat transfer due to radiation. A closed form analytical solution to the problem is obtained. The analytical results are evaluated numerically and then presented graphically to discuss in detail the effects of different parameters entering into the problem. A number of particular cases have been shown by dotted curves in the figures. During the analysis it is found that the physical and the mathematical formulations of the problems by Makinde and Mhone (2005), Mehmood and Ali (2007), Kumar et al. (2010) and Choudhury and Das (2012) are not correct. The correct solutions to all these important oscillatory flow problems are deduced.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1237-1248
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-Newtonian momentum transfer past an isothermal stretching sheet with applied suction
    Autorzy:
    Veena, P. H.
    Suresh, B.
    Pravin, V. K.
    Goud, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/264590.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    non-Newtonian fluid
    magnetic field
    permeability
    effect of viscoelasticity
    płyn nieniutonowski
    pole magnetyczne
    przepuszczalność
    lepkosprężystość
    Opis:
    The paper discusses the flow of an incompressible non-Newtonian fluid due to stretching of a plane elastic surface in a saturated porous medium in the approximation of boundary layer theory. An exact analytical solution of non-linear MHD momentum equation governing the self-similar flow is given. The skin friction co-efficient decreases with an increase in the visco-elastic parameter k1 and increase in the values of both the magnetic parameter and permeability parameter.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 665-674
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pattern of stress-strain accumulation due to a long dipslip fault movement in a viscoelastic layered model of the lithosphere–asthenosphere system
    Autorzy:
    Debnath, S. K.
    Sen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/264497.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    trzęsienie ziemi
    lepkosprężystość
    aktywność sejsmiczna
    aseismic period
    dip-slip fault
    earthquake prediction
    stress accumulation
    viscoelastic-layered model
    Opis:
    The process of stress accumulation near earthquake faults during the aseismic period in between two major seismic events in seismically active regions has become a subject of research during the last few decades. In the present paper a long dip -slip fault is taken to be situated in a viscoelastic layer over a viscoelastic half space representing the lithosphere-asthenosphere system. A movement of the dip-slip nature across the fault occurs when the accumulated stress due to various tectonic reasons, e.g., mantle convection etc., exceeds the local friction and cohesive forces across the fault. The movement is assumed to be slipping in nature, expressions for displacements, stresses and strains are obtained by solving the associated boundary value problem with the help of integral transformation and Green's function method. A detailed study of these expressions may give some ideas about the nature of stress accumulation in the system, which in turn will be helpful in formulating an earthquake prediction programme.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 653-670
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exact solutions for the incompressible electrically conducting viscous flow between two moving parallel disks in unsteady magneto hydrodynamic and stability analysis
    Autorzy:
    Balagondar, P. M.
    Kempe Gowda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/264517.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    lepkosprężystość
    hydromagnetyka
    analiza stabilności
    równanie różniczkowe
    viscous flows
    magnetohydrodynamic
    stability analysis
    Riabouchinsky flow
    Hermite’s differential equation
    Opis:
    The main interest of the present investigation is to generate exact solutions to the steady Navier-Stokes equations for the incompressible Newtonian viscous electrically conducting fluid flow motion and stability due to disks moving towards each other or in opposite directions with a constant velocity. Making use of the analytic solution, the description of possible conditions of motion is based on the exact solutions of the Navier-Stokes equations. Both stationary and transient cases have been considered. The stability of motion is analyzed for different initial perturbations. Different types of stability were found according to whether the disks moved towards or away from each other.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 571-579
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic vibration extinguished on a viscously elastic base
    Autorzy:
    Ishmamatov, M.
    Kulmuratov, N.
    Khalilov, S.
    Akhmedov, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839871.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    tłumik dynamiczny
    oscylacja
    lepkosprężystość
    dynamic damper
    oscillations
    viscoelastic plate
    integro-differential equation
    amplitude-frequency dependence
    Boltzmann-Voltaire integral
    Opis:
    The aim of the work is to develop algorithms and a set of programs for studying the dynamic characteristics of viscoelastic thin plates on a deformable base on which it is installed with several dynamic dampers. The theory of thin plates is used to obtain the equation of motion for the plate. The relationship between the efforts and the stirred plate obeys in the hereditary Boltzmann Voltaire integral. With this, a system of integro-differential equations is obtained which is solved by the method of complex amplitudes. As a result, a transcendental algebraic equation was obtained to determine the resonance frequencies, which is solved numerically by the Muller method. To determine the displacement of the point of the plate with periodic oscillations of the base of the plate, a linear inhomogeneous algebraic equation was obtained, which is solved by the Gauss method. The amplitude - frequency response of the midpoint of the plate is constructed with and without regard to the viscosity of the deformed element. The dependence of the stiffness of a deformed element on the frequency of external action is obtained to ensure optimal damping of vibrational vibrations of the plate.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 1-10
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy stability of Benard-Darcy two-component convection of Maxwell fluid
    Autorzy:
    Muti, H.
    Demir, H.
    Siddheshwar, P. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/265656.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    stabilność energetyczna
    metoda Lapunowa
    lepkosprężystość
    płyn Maxwell'a
    relaksacja naprężeń
    energy stability analysis
    Lyapunov direct method
    Benard-Darcy convection
    viscoelastic
    twocomponent Maxwell fluid
    stress relaxation
    Opis:
    Energy stability of a horizontal layer of a two-component Maxwell fluid in a porous medium heated and salted from below is studied under the Oberbeck-Boussinesq-Darcy approximation using the Lyapunov direct method. The effect of stress relaxation on the linear and non-linear critical stability parameters is clearly brought out with coincidence between the two when the solute concentration is dilute. Qualitatively, the result of porous and clear fluid cases is shown to be similar. In spite of lack of symmetry in the problem it is shown that non linear exponential stability can be handled.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 125-135
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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