<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Freitas, J. A. T.</style></author><author><style face="normal" font="default" size="100%">Cismaşiu, C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Hybrid-{T}refftz displacement element for spectral analysis of bounded and unbounded media</style></title><secondary-title><style face="normal" font="default" size="100%">International Journal of Solids and Structures</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">hybrid-{T}refftz displacement elements</style></keyword><keyword><style  face="normal" font="default" size="100%">spectral analysis</style></keyword><keyword><style  face="normal" font="default" size="100%">unbounded media</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2003</style></year></dates><volume><style face="normal" font="default" size="100%">40</style></volume><pages><style face="normal" font="default" size="100%">671-699</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The hybrid-{T}refftz displacement element is applied to the elastodynamic analysis of bounded and unbounded media in the frequency domain. The displacements are approximated in the domain of the element using local solutions of the wave equation, the Neumann conditions are enforced directly and the surface forces are approximated on the Dirichlet and inter-element boundaries of the finite element mesh. Two alternative elements are developed to model unbounded media, namely a finite element with absorbing boundaries and an unbounded element that satisfies explicitly the Sommerfeld condition. The finite element equations are derived from the fundamental relations of elastodynamics written in the frequency domain. The numerical implementation of these equations is discussed and numerical tests are presented to assess the performance of the formulation.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;n/a&lt;/p&gt;
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