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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

[en] STRESS AND STRAIN ANALYSIS OF COMPOSITE SHELLS WITH GENERAL GEOMETRIES / [pt] ANÁLISE DE TENSÕES E DEFORMAÇÕES EM CASCAS COMPOSTAS DE GEOMETRIAS ARBITRÁRIAS

CARLOS ALBERTO VIANNA TAVARES 04 April 2012 (has links)
[pt] Este trabalho apresenta a modelagem teórica e correspondente solução numérica, associada ao problema de tensões e deformações em cascas compostas de geometrias arbitrárias, submetidas a carregamento térmico e/ou de pressão. A casca composta é constituída de uma camada viscoelástica reforçada por outras duas elásticas. Apresentam-se as hipóteses adotadas na caracterização térmica e mecânica do material, bem como procedimentos e resultados obtidos na aplicação destas suposições. Problemas envolvendo geometrias cilíndricas e cônicas são resolvidas com o objetivo de exemplificar a teoria desenvolvida. / [en] The present work sets forth the expressions for the stresses and strains in a sandwich shell of arbitrary shape under thermal and pressure loads. The composite shell is made of two elastic face lawers with a viscoelastic core. The elastic facings are isotropic of the same material and obey the kirchhoff hypotesis. The viscoelastic core is assumed to be thermorheologically simple as a way to facilitate the mathematical representation of the creep modulus on temperature. In order to simplify the derivations of the needed equations it is assumed that the stresses in the core acting in the tangencial directions are much smaller than those developed in the facing, so that theycan be neglected. The general equations for the stresses and strains are written using curvilinear shell coordinates and some results are then shown for cylindrical and conical shell geometries.

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