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Doctoral Thesis
DOI
https://doi.org/10.11606/T.3.2005.tde-24052024-075255
Document
Author
Full name
Eduardo de Morais Barreto Campello
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2005
Supervisor
Committee
Pimenta, Paulo de Mattos (President)
Alves, Marcilio
Battista, Ronaldo Carvalho
Coutinho, Alvaro Luiz Gayoso de Azeredo
Wringgers, Peter
Title in Portuguese
Modelos não-lineares de casca em elasticidade e elastoplasticidade com grandes deformações: teoria e implementação em elementos finitos.
Keywords in Portuguese
Cascas (Engenharia)
Deformações finitas
Método dos Elementos Finitos
Abstract in Portuguese
Este trabalho apresenta modelos de casca que são geometricamente exatos e totalmente consistentes para grandes deformações. Rotações finitas são tratadas de maneira exata por meio do tensor de Euler-Rodrigues, e resultantes das seções transversais são apropriadamente definidos. Hiperelasticidade e elastoplasticidade são consideradas. As formulações são direcionadas para procedimentos numéricos baseados nas projeções de Galerkin, como o método dos elementos finitos. Neste sentido, um elemento triangular de casca é desenvolvido a partir de uma abordagem pura de deslocamentos, e o travamento não se manifesta sobre a sua performance. O desempenho é excelente em inúmeros exemplos.
Title in English
Nonlinear shell models in elasticity and elastoplasticity at finite strains: theory and finite element formulation.
Keywords in English
Finite Element Methods
Finite strains
Shells
Abstract in English
This work presents geometrically-exact finite-strain shell models for the solution of large deformation shell problems. Finite rotations are treated by the Euler-Rodrigues formula in a fully exact way, and cross-sectional resultants are consistently defined. Both hiperelasticity and elastoplasticity are considered. A special displacement-based triangular finite element is introduced, over which the models are implemented. Locking is not observed as the performance of the element and accuracy of the formulations are assessed by means of several numerical examples. Excellent results are found.
 
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Publishing Date
2024-05-24
 
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