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Full-Text Articles in Engineering
Full Field Computing For Elastic Pulse Dispersion In Inhomogeneous Bars, A. Berezovski, R. Kolman, M. Berezovski, D. Gabriel, V. Adamek
Full Field Computing For Elastic Pulse Dispersion In Inhomogeneous Bars, A. Berezovski, R. Kolman, M. Berezovski, D. Gabriel, V. Adamek
Publications
In the paper, the finite element method and the finite volume method are used in parallel for the simulation of a pulse propagation in periodically layered composites beyond the validity of homogenization methods. The direct numerical integration of a pulse propagation demonstrates dispersion effects and dynamic stress redistribution in physical space on example of a one-dimensional layered bar. Results of numerical simulations are compared with analytical solution constructed specifically for the considered problem. Analytical solution as well as numerical computations show the strong influence of the composition of constituents on the dispersion of a pulse in a heterogeneous bar and …
Bulk And Surface Retarded Modes In Multilayered Structures - Antiparallel Magnetization, H. How, C. Vittoria
Bulk And Surface Retarded Modes In Multilayered Structures - Antiparallel Magnetization, H. How, C. Vittoria
Carmine Vittoria
The wave dispersion relations of the mixed polariton-photon modes propagating within the bulk and along the surface of a semi-infinite magnetic/nonmagnetic layered structure with an alternating arrangement of the magnetization are calculated. The magnetic layers are magnetized to saturation along the uniaxial anisotropy axis, and the waves are considered to propagate transverse to this axis. The results are contrasted with those calculated for a layered structure in which the magnetization in each layer is parallel to each other. For the antiparallel case there evolve modes of wave propagation which assume different dispersion forms when compared to the parallel case. In …
Surface Retarded Modes In Multilayered Structures – Parallel Magnetization, H. How, C. Vittoria
Surface Retarded Modes In Multilayered Structures – Parallel Magnetization, H. How, C. Vittoria
Carmine Vittoria
The wave dispersion relations of the mixed polariton-photon modes along the surface of a semi-infinite layered structure consisting of alternating magnetic and nonmagnetic films are calculated. The magnetic films are magnetized to saturation by an external field parallel to the film plane and perpendicular to the wave propagation direction. Three different types of surpace modes are found and discussed. the surface-surface-type and (lower) surface-bulk-type modes can exist in a general layered structure which, when propogating in the positive k direction, corresponds in magnetostatic limit to those surface modes found by Camley et al. For negative k propagation of surface-surface-type modes, …
Wave Propagation And Dispersion In Microstructured Solids, Arkadi Berezovski, Juri Engelbrecht, Mihhail Berezovski
Wave Propagation And Dispersion In Microstructured Solids, Arkadi Berezovski, Juri Engelbrecht, Mihhail Berezovski
Publications
A series of numerical simulations is carried on in order to understand the accuracy of dispersive wave models for microstructured solids. The computations are performed by means of the finite-volume numerical scheme, which belongs to the class of wave-propagation algorithms. The dispersion effects are analyzed in materials with different internal structures: microstructure described by micromorphic theory, regular laminates, laminates with substructures, etc., for a large range of material parameters and wavelengths.
Determination Of Plate Source, Detector Separation From One Signal, Stephen D. Holland, Tadej Kosel, Richard Weaver, Wolfgang Sachse
Determination Of Plate Source, Detector Separation From One Signal, Stephen D. Holland, Tadej Kosel, Richard Weaver, Wolfgang Sachse
Stephen D. Holland
We address the problem of locating a transient source, such as an acoustic emission source, in a plate. We apply time-frequency analysis to the signals detected at a receiver. These highly dispersive and complex waveforms are measured for source-receiver separations ranging from 40 to 180 plate thicknesses and at frequencies such that ten to twenty Rayleigh-Lamb branches are included. Re-assigned, smoothed, pseudo-Wigner-Ville distributions are generated that exhibit the expected sharp ridges in the time-frequency plane, lying along the predicted frequency-time-of-arrival relations. The source-receiver separation can be determined from such plots.