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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

Sintese de funções de Green e estados auxiliares viscoelastodinamicos em meios tridimensionais ilimitados com auxilio da transformada de Radon / Synthesis of viscoelastodynamic Green functions and auxiliary states for three-dimensional unbounded domains with aid of the Radon transform

Adolph, Marco 03 July 2006 (has links)
Orientador: Euclides de Mesquita Neto / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-09T07:13:04Z (GMT). No. of bitstreams: 1 Adolph_Marco_D.pdf: 9999341 bytes, checksum: 0336316213626e1dcf851637c49e82be (MD5) Previous issue date: 2006 / Resumo: O objetivo deste trabalho foi desenvolver uma formulação para obtenção de Funções de Green e estados auxiliares para os problemas viscoelastodinâmicos tridimensionais. Os problemas são descritos com auxílio de equações diferenciais, as quais foram solucionadas utilizando as transformadas de Radon e Fourier, bem como condições de contorno específicas. A transformada inversa é realizada numericamente. Essa formulação resulta em soluções com apenas uma integral imprópria e uma limitada, porém, quando se adota transformada de Fourier, são obtidas duas integrais ilimitadas. Para os problemas isotrópicos, essa formulação permite o desacoplamento do problema tridimensional em dois problemas auxiliares bidimensionais. As respostas de tensão e deslocamento foram deduzidas para os problemas de semi-espaço com cargas concentrada e distribuída, bem como de espaços completos submetidos a carregamento distribuído. A implementação numérica foi validada com auxílio das soluções estáticas de Cerruti, Boussinesq e Kelvin, bem como com implementações numéricas dinâmicas baseadas na transformada dupla de Fourier. Foram obtidos bons resultados. É apresentada a formulação para semi-espaços anisotrópicos / Abstract: The purpose of this study was to develop a formulation to obtain Green's functions and auxiliary states in order to solve three-dimensional viscoelastodynamic problems. The problems are described with the aid of differential equations, which were solved by using the Radon and Fourier transforms, as well as specific boundary conditions. The inverse transform was numerically accomplished. This formulation resulted in solutions with a single (one) improper integral and a finite one, however, in case of using the Fourier transform, two infinite integrals are obtained. As for the isotropic-related problems, this formulation allows to break up the threedimensional problem into two auxiliary two-dimensional problems. The stress and displacement solutions were obtained for problems related to half-space under concentrated and distributed loads, as well as to whole-spaces under a distributed load. The numerical implementation was validated by using the Cerruti, Boussinesq and Kelvin¿s static solutions, and numerical dynamic responses based on the double Fourier transform. Thus, effective results were obtained. In addition, it was included the formulation for anisotropy half-spaces / Doutorado / Mecanica dos Solidos / Doutor em Engenharia Mecânica

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