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    Wyświetlanie 1-8 z 8
    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:
    Corneal hyper-viscoelastic model: derivations, experiments, and simulations
    Autorzy:
    Su, P.
    Yang, Y.
    Song, Y
    Powiązania:
    https://bibliotekanauki.pl/articles/307042.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    rogówka
    biomechanika
    hiperelastyczność
    lepkosprężystość
    cornea
    biomechanics
    constitutive model
    hyperelastic
    viscoelastic
    Opis:
    Purpose: The aim of this study is to propose a method to construct corneal biomechanical model which is the foundation for simulation of corneal microsurgery. Methods: Corneal material has two significant characteristics: hyperelastic and viscoelastic. Firstly, Mooney–Rivlin hyperelastic model of cornea obtained based on stored-energy function can be simplified as a linear equation with two unknown parameters. Then, modified Maxwell viscoelastic model of the cornea, whose analytical form is consistent with the generalized Prony-series model, is proposed from the perspective of material mechanics. Results: Parameters of the model are determined by the uniaxial tensile tests and the stress-relaxation tests. Corneal material properties are simulated to verify the hyper-viscoelastic model and measure the effectiveness of the model in the finite element simulation. On this basis, an in vivo model of the corneal is built. And the simulation of extrusion in vivo cornea shows that the force is roughly nonlinearly increasing with displacement, and it is consistent with the results obtained by extrusion experiment of in vivo cornea. Conlusions: This paper derives a corneal hyper-viscoelastic model to describe the material properties more accurately, and explains the mathematical method for determination of the model parameters. The model is an effective biomechanical model, which can be directly used for simulation of trephine and suture in keratoplasty. Although the corneal hyper-viscoelastic model is taken as the object of study, the method has certain adaptability in biomechanical research of ophthalmology.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 2; 73-84
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    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:
    Forced response of plate with viscoelastic auxetic dampers
    Autorzy:
    Stręk, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/127993.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    auxetic
    viscoelastic
    damper
    finite element method
    auksetyki
    lepkosprężystość
    tłumik
    metoda elementów skończonych
    Opis:
    The example studies a forced response of plate with viscoelastic auxetic damper located at the free end of the plate. Damping elements consist of the cover layer and layer of viscoelastic material with positive or negative Poisson's ratio. Viscoelastic materials are often used for reduction of vibration (seismic or wind induced vibrations in building structures or other structures). The common feature is that the frequency of the forced vibrations is low. Calculations are made using finite element method with Comsol Multiphysics software.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-9
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    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:
    Analysis of different material theories used in a FE model of a lumbar segment motion
    Autorzy:
    Gohari, E.
    Nikkhoo, M.
    Haghpanahi, M.
    Parnianpour, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/307482.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    creep
    dynamic loading
    finite element method
    lumbar motion segment
    poroelastic
    viscoelastic
    pełzanie
    porosprężystość
    lepkosprężystość
    metoda elementów skończonych
    Opis:
    In this study, a nonlinear poroelastic model of intervertebral disc as an infrastructure was developed. Moreover, a new element was defined consisting a disc (Viscoelastic Euler Beam Element) and a vertebra (Rigid Link) as a unit element. Using the new element, three different viscoelastic finite element models were prepared for lumbar motion segment (L4/L5). Prolonged loading (short-term and longterm creep) and cyclic loading were applied to the models and the results were compared with results of in vivo tests. Simplification of the models by using the new element leads to reduction of the runtime of the models in dynamic analyses to few minutes without losing the accuracy in the results.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 2; 33-41
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Contact Problems With Velocity Conditions
    Autorzy:
    Chau, O.
    Motreanu, V. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/907895.pdf
    Data publikacji:
    2002
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    lepkosprężystość
    viscoelastic
    elastic
    subdifferential boundary condition
    dynamic process
    nonlinear hyperbolic variational inequality
    maximal monotone operator
    weak solution
    Opis:
    We consider dynamic problems which describe frictional contact between a body and a foundation. The constitutive law is viscoelastic or elastic and the frictional contact is modelled by a general subdifferential condition on the velocity, including the normal damped responses. We derive weak formulations for the models and prove existence and uniqueness results. The proofs are based on the theory of second-order evolution variational inequalities. We show that the solutions of the viscoelastic problems converge to the solution of the corresponding elastic problem as the viscosity tensor tends to zero and when the frictional potential function converges to the corresponding function in the elastic problem
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2002, 12, 1; 17-26
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    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 1-8 z 8

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