National Repository of Grey Literature 38 records found  beginprevious19 - 28next  jump to record: Search took 0.01 seconds. 
Influence of random material heterogeneity on longitudinal harmonic wave propagation
Náprstek, Jiří
The paper deals with mathematical modelling and properties of linear longitudinal wave propagating in one dimensional body with random imperfections in material density and Young modulus.
Wave propagation in 3D anisotropic media with cubic symmetry
Červ, Jan
Harmonic wave propagation in an anisotropic medium with cubic symmetry is studied in the paper. First of all, the general relation for phase velocities and polarizations vectors of qL and qT waves having wave vectors in planes {1 0 0} have been derived. For a general direction of wave vector in turns out that the best way to get the solution is numerical solution based on Matlab.
Interpretation of the false roots in the dispersion curves of thick plates
Hora, Petr ; Červená, Olga
This paper deals with the interpretation of the false roots appearing in the numerical computation of thick plate dispersion curves from isotropic or anisotropic materials. The examples of false roots, the reasons of their occurrence, the possibilities of their detection and removing are presented here. Dispersion curves are computed for steel and the unidirectional composite.
Vliv Mindlinových okrajových podmínek na šíření vln v tlusté anizotropní desce
Červená, Olga ; Hora, Petr
This paper deals with analytical formulation of dispersion curves for stress waves in a free (001)-cut cubic and orthotropic plate. The direction of wave propagation is arbitrary. The dispersion curves for Cu and carbon reinforced composite are presented. These results are compared to the uncoupled Mindlin modes. This work is very important for determination of the elastic coefficients of anisotropic materials.
Simulation of elastic wave propagation in fcc copper and fcc nickel
Pelikán, Vladimír ; Hora, Petr ; Machová, Anna
We present large-scale molecular dynamic simulations of wave propagation in fcc copper and fcc nickel based on an N-body potential model which gives a good description of anisotropic elasticity. We show that the basic behavior of the simulations is in agreement with the predictions of continuum models.
Analytical formulation of dispersion curves in a plate with cubic anisotropy for arbitrary direction of wave propagation
Červená, Olga ; Hora, Petr
This paper deals with analytical formulation of dispersion curves for stress waves in a free (001)-cut cubic plate. The direction of wave propagation is arbitrary and it is defined by the angle .FI., the angle between the [100] axis and the wave vector. The dispersion curves for Cu are presented. These results are compared to the uncoupled Mindlin modes.
Dispersion curves in plate of cubic anisotropy
Hora, Petr ; Červená, Olga
The mathematical technique for obtaining dispersion curves for stresswaves in free plates of arbitrary anisotropy is outlined. The dispersion relations forpropagation in a (001)-cut cubic plate are obtained. The dispersion curves for Cuare presented. These results are compared to the uncoupled SV and P modes.
R-vlny v tenkých vzorcích zhotovených z laminátů či anisotropních kovů
Červ, Jan
The differences between of Rayleigh waves propagated along the edge of a thin orthotropic medium made of laminate or given metallic structure are studied in the paper.
Some conditions for existence of R-waves in an orthotropic elastic half-plane
Červ, Jan
In the paper are studied some conditions which are necessary for the existence of Rayleigh (edge) waves in an orthotropic elastic half-plane.
The propagation of the stress waves in an inhomogeneous media.
Hora, Petr ; Šiňor, M.
In this contribution we pay attention to the propagation of the stress waves in an arbitrary complex inhomogeneous media. For the system of elastodynamic wave equations we have adopted the method of solution based on the local interaction simulation approach (LISA) and the sharp interface model (SIM).The implementation of LISA/SIM in 2D and 3D to computer codes is done in the C programming language. Preprocessor is done in the programming language Python with graphics library wxPython/wxWindows.

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