The Experts below are selected from a list of 210 Experts worldwide ranked by ideXlab platform
C.t. Sun - One of the best experts on this subject based on the ideXlab platform.
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A continuum model with microstructures for wave propagation in ultra-thin films
International Journal of Solids and Structures, 2006Co-Authors: G.l. Huang, C.t. SunAbstract:AbstractUltrasonic waves are powerful and popular methods for measuring mechanical properties of solids even at nanoscales. The extraction of material constants from the measured wave data requires the use of a model that can accurately describe the wave motion in the solid. The objective of this paper is to develop a continuum theory with microstructures that can capture the effect of the microstructure or nanostructure in ultra-thin films when waves of short wavelengths are used. This continuum theory is developed from Assumed Displacement fields for microstructures. Local kinematic variables are introduced to express these local Displacements and are subjected to internal continuity conditions. The accuracy of the present theory is verified by comparing the results with those of the lattice model for the thin film. Specifically, dispersion curves for surface wave propagation and wave propagation in a thin film supported by an elastic homogeneous substrate are studied. The inadequacy of the conventional continuum theory is discussed
F. Song - One of the best experts on this subject based on the ideXlab platform.
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High-frequency antiplane wave propagation in ultra-thin films with nanostructures
International Journal of Solids and Structures, 2008Co-Authors: Guoliang Huang, F. SongAbstract:Ultrasonic wave propagation is one of powerful and popular methods for measuring mechanical properties of solids even at nano scales. The extraction of material constants from the measured wave data may not be accurate and reliable when waves of short wavelengths are used. The objective of this paper is to study the high-frequency antiplane wave propagation in ultra-thin films at nanoscale. A developed continuum microstructure theory will be used to capture the effect of nanostructures in ultra-thin films. This continuum theory is developed from Assumed Displacement fields for nanostructures. Local kinematic variables are introduced to express these local Displacements and are subjected to internal continuity conditions. The accuracy of the theory is verified by comparing the results with those of the lattice model for the antiplane problem in an infinite elastic medium. Specifically, dispersion curves and corresponding Displacement fields for antiplane wave propagation in the ultra-thin films are studied. The inadequacy of the conventional continuum theory is discussed.
G.l. Huang - One of the best experts on this subject based on the ideXlab platform.
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A continuum model with microstructures for wave propagation in ultra-thin films
International Journal of Solids and Structures, 2006Co-Authors: G.l. Huang, C.t. SunAbstract:AbstractUltrasonic waves are powerful and popular methods for measuring mechanical properties of solids even at nanoscales. The extraction of material constants from the measured wave data requires the use of a model that can accurately describe the wave motion in the solid. The objective of this paper is to develop a continuum theory with microstructures that can capture the effect of the microstructure or nanostructure in ultra-thin films when waves of short wavelengths are used. This continuum theory is developed from Assumed Displacement fields for microstructures. Local kinematic variables are introduced to express these local Displacements and are subjected to internal continuity conditions. The accuracy of the present theory is verified by comparing the results with those of the lattice model for the thin film. Specifically, dispersion curves for surface wave propagation and wave propagation in a thin film supported by an elastic homogeneous substrate are studied. The inadequacy of the conventional continuum theory is discussed
J Jirousek - One of the best experts on this subject based on the ideXlab platform.
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Accurate representation of local effects due to concentrated and discontinuous loads in hybrid-Trefftz plate bending elements
Computers & Structures, 1995Co-Authors: A Venkatesh, J JirousekAbstract:Abstract As opposed to conventional conforming elements, the Assumed Displacement field of a hybrid-Trefftz (HT) element must accurately satisfy the differential equilibrium conditions while the conformity is then imposed in a weighted residual sense. Unlike the homogeneous part of the element Displacement field, the particular load-dependent part may be represented, in the case of a concentrated or a discontinuous load, by a suitable local solution extending either over the whole plate or confined to a patch of elements in the vicinity of the load. The main advantage of such an approach is that the FE mesh and, to a large extent, also the solution accuracy are independent of the load. The paper presents explicit expression of local solutions for a line load and a patch load which are of particular interest to plate bending analysis in the engineering practice. The accuracy and efficiency of the approach are assessed in a series of benchmark problems.
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comparative study of p extensions based on conventional Assumed Displacement and hybrid trefftz fe models
Computers & Structures, 1993Co-Authors: J Jirousek, A Venkatesh, A P Zielinski, H RabemanantsoaAbstract:Reference EPFL-ARTICLE-102726doi:10.1016/0045-7949(93)90191-FView record in Web of Science Record created on 2007-04-23, modified on 2016-08-08
Guoliang Huang - One of the best experts on this subject based on the ideXlab platform.
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High-frequency antiplane wave propagation in ultra-thin films with nanostructures
International Journal of Solids and Structures, 2008Co-Authors: Guoliang Huang, F. SongAbstract:Ultrasonic wave propagation is one of powerful and popular methods for measuring mechanical properties of solids even at nano scales. The extraction of material constants from the measured wave data may not be accurate and reliable when waves of short wavelengths are used. The objective of this paper is to study the high-frequency antiplane wave propagation in ultra-thin films at nanoscale. A developed continuum microstructure theory will be used to capture the effect of nanostructures in ultra-thin films. This continuum theory is developed from Assumed Displacement fields for nanostructures. Local kinematic variables are introduced to express these local Displacements and are subjected to internal continuity conditions. The accuracy of the theory is verified by comparing the results with those of the lattice model for the antiplane problem in an infinite elastic medium. Specifically, dispersion curves and corresponding Displacement fields for antiplane wave propagation in the ultra-thin films are studied. The inadequacy of the conventional continuum theory is discussed.
