Elasto Plastic Constitutive Model
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Determination of Forming Limit Diagrams Based on Ductile Damage Models and Necking Criteria
Abstract In this paper, forming limit diagrams (FLDs) for an aluminum alloy are predicted through numerical simulations using various localized necking criteria. A comparative study is conducted for the FLDs determined by using the Lemaitre damage approach and those obtained with the modified Gurson-Tvergaard-Needleman (GTN) damage model. To this end, both d
Lat. Am. j. solids struct.. Publicado em: 2017-10
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2. Análise por elementos finitos de maciços escavados por túneis. / Finite element analysis of tunnel excavation.
O presente trabalho de pesquisa aborda a aplicação de análise por elementos finitos a maciços escavados por túneis, revisando relevantes estudos sobre análise numérica deste tipo de obra e realizando modelagem numérica própria, bi e tridimensional, voltada ao caso do Túnel Paraíso do Metrô de São Paulo (obra com dados de instrumentação e de en
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/07/2011
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3. Um modelo elasto-plástico para a análise da aderência em peças de concreto armado / An elasto-plastic model for analysis of bond in reinforced concrete
The bond mechanism between deformed bars and concrete is a complex phenomenon, influenced by many parameters. Many models have been developed over the years regarding this subject, but only a few have satisfactorily reproduced the physical phenomenon. In this work, to simulate the bond behavior, we propose a two-dimensional interface model where both concret
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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4. Análises tensão-deformação de estruturas de solo grampeado. / Stress-Strain analysis of soil nailed structures.
The limit equilibrium methods that are frequently used for design of soi nailing structures do not provide information about the structures stress and strain. However, the techniques success depends on the displacements that mobilize the nails strength. Therefore it is desirable to predict the structures displacement, during and after the excavation; the for
Publicado em: 2008
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5. Estudo do comportamento de túneis: análise numérica tridimensional com modelos elasto-plásticos. / Study of the behaviour of tunnels: elasto-plastic constitutive model three-dimensional numerical analyses.
The present research approaches the study of the behaviour of tunnels in soil. It is given emphasis in the application of numerical analyses using different elasto-plastic constitutive models for soils. Three-dimensional numerical analyses of a widely instrumented tunnel belonging to the Company of the Metropolitan of São Paulo are presented. The analyses a
Publicado em: 2006
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6. ANÁLISE ELASTOPLÁSTICA VIA MEF DE PROBLEMAS EM SOLOS REFORÇADOS
Reinforced earth structure is a composite system that involves basically three components: the soil, the reinforcement and the soil-reinforcement interface. The performance of the reinforced structure will depend on the interaction among these components. This interaction can be studied by monitoring a sufficiently large number of full scale field tests, lab
Publicado em: 2006
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7. Análise dinâmica elasto-plástica de estruturas metálicas sob excitação aleatória de vento. / Elastic-plastic dynamic analysis of steel structures under random vibrations excited by the wind.
This work presents a numerical model to analyze structures under random dynamic excitation induced by the wind. The structure is considered to have nonlinear behavior due to the elastic-plastic constitutive law adopted for the material, structural steel. The members of the studied structures may experience formation or disappearance of plastic hinges, leadin
Publicado em: 2003
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8. APLICACIÓN DE ELEMENTOS FINITOS DE INTERFACE A MODELOS DE MODOS MIXTOS DE FISURAS / MODELING OF MIXED MODE CRACKS IN MASONRY STRUCTURES USING INTERFACE FINITE ELEMENTS / APLICAÇÃO DE ELEMENTOS FINITOS DE INTERFACE À MODELAGEM DE MODOS MISTOS DE FISSURAÇÃO
Since masonry is a widely employed material, it is fundamental to better characterize its structural performance and extend its use beyond functional applications (separation of environments). In this work a finite element model for masonry structures is presented. By using a sophisticated numerical tool based on the finite element method, associated to suit
Publicado em: 1999
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9. THREE DIMENSIONAL ELASTOPLASTIC CONTACT ANALYSIS BY LARGE STRAINS / ANÁLISE ELASTO-PLÁSTICA DO PROBLEMA DE CONTATO COM GRANDES DEFORMAÇÕES EM ESTRUTURAS TRIDIMENSIONAIS
In this theses the frictionless contact problem between two- dimensional or three-dimensional deformable bodies with elasto-plastic behavior under finite strains is studied. The numeric solution procedure is based on an incremental- iterative strategy and includes the treatment of geometric and physical nonlinearities as well as those which arise from contac
Publicado em: 1998
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10. MODELAGEM DE LOCALIZAÇÃO DE DEFORMAÇÕES COM TEORIAS DE CONTÍNUO GENERALIZADO / MODELS FOR STRAIN LOCALIZATION WITH THEORIES OF GENERALIZED CONTINUA
The use of a classical continuum theory, together with local models for the constitutive relations, leads to physical inconsistencies in the representation of strain localization.In this thesis, generalized continuum theories are used in order to describe consistently localization mechanisms.In a first stage, the micropolar theory is associated with an elast
Publicado em: 1997
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11. A CONTRIBUTION TO THE THEORY OF INELASTIC RODS / UMA CONTRIBUIÇÃO À TEORIA DE ESTRUTURAS UNIDIMENSIONAIS INELÁSTICAS
A survey of rod¿s models which are not based in the three-dimensional theory is presented. One of the models is picked out and discussed in details (kinematics, efforts and balance laws). An elasto-plastic constitutive model is considered. This model takes into account large deformations and the extensibility of the tods. A series of numerical simulations o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/06/1986