Métodos de controle de deformações para análise não-linear de estruturas

• Ano de defesa: 2004
• Autor(a) principal: Jamile Salim Fuina
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Ponto de Gauss; Análise não-linear; Engenharia de estruturas
• Link de acesso: http://hdl.handle.net/1843/LMCA-769HM7

This work discusses the determination of the equilibrium paths in the nonlinear finite element structural analysis. A detailed study about the incremental-iterative procedures, that use load and displacement combinations as the analysis controlling parameters, is presented.The limitations of the classical methods in physically nonlinear problems are discussed. A method, that includes the mechanics of the material deterioration process, using strain combinations in subdomains of the problem, is proposed. The combinations are strain measures suchas mean, invariants, eigenvalues, among others. The subdomains are characterised as groups of integration points, since in the Finite Element Method, usually, the strains are obtained in these points. Such groups can be chosen as the whole finite element mesh, one or more finite elements or just one integration point. The proposed method permits the change of the control subdomain (one integration point or one finite element) during the analysis process. This change is based on the search for region that sampled the largest increase on the standingcontrol combination in the last incremental step. The computational implementation details of the proposed model into a object orientedfinite element program is discussed. Some numerical simulations of physically or geometrically nonlinear problems are presented. The analysis of the obtained results permits to discuss the adequacy of the classical and proposed methods in the solution of the problems.