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Transient Vibration of Thin Rectangular Elastic and Viscoelastic Isotropic and Orthotropic Plate
Soukup, J. ; Trnka, Jan ; Valeš, František ; Volek, J.
The article is a part of the systematic analisys of assumption effects on the transient vibration of isotropic or orhotropic elastic and viscoelastic thin 2D plate. Several deformation models - according to Kirchhoff, Rayleigh, Flügge, Mindlin - were applied. The linear models of material rheologic properties were applied according to Hook, Voigt-Kelvin, Maxwell, Zener models. The results obtained by FEM methods and experiments are mutually compared.
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Nestacionární pohyb tenké ortotropní desky zatížené impulsní silou
Valeš, František ; Červ, Jan ; Volek, J.
Analytical solutions based on Flügge and Mindlin approximations of a thin elastic orthotropic plate under transverse impulse loading are discussed in the paper. The results in the form of displacements and velocities are compared with those obtained by 3D finite element solutions. Dispersion behaviour of the Mindlin approximation is studied as well. It was found out that there are always three different dispersion curves for any arbitrary direction of propagation.
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Modeling of the impact of railway wheel on a rail
Valeš, František ; Červ, Jan ; Tikal, B. ; Adámek, V.
This contribution concerns the simulation of wave phenomena originating by impacts of a railway wheel on a rail. With respect to the character of these phenomena running in time of microsecond order, it is not possible to model contacting bodies in true dimensions. Hence the model research has to be used and dimensions of bodies are chosen in such way so that the numerical solution (FEM) is feasible.The influence of material models (elastic and plastic) are studied in this work.Furthermore, the influence of plastic layer generated during wheel service on wave phenomena in the wheel is investigated.
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The influence of non-linear properties of material on the stress-wave propagation
Lašová, V. ; Laš, V. ; Valeš, František
This paper deals with the numerical solution of the stress wave propagation in continuum. In order to obtain the comparison of the numerical and analytical solutions, a thin round bar clamped at one end and dynamically loaded by a time-step function and the latter one was considered. Observed was the propagation of both the elastic and plastic waves. The interaction between the statically preloaded region and the stress waves was invertigated too.
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