Elastoplastic Model
Mostrando 13-24 de 39 artigos, teses e dissertações.
-
13. An elastoplastic numerical model of rolling contact applied to analyze the fatigue of railroad wheels / Modelo numerico elastoplastico de contato com rolamento aplicado a analise de fadiga de rodas ferroviarias
This work proposes a wheel-rail contact model based on finite element method to estimate the fatigue life to shelling, until the beginning of the crack of a railroad wheel class C of a heavyhull Brazilian railroad from Serra dos Carajás. The main contribution of this work is the elastoplastic approach with the inclusion of the residual stress generated by t
Publicado em: 2008
-
14. 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
-
15. DYNAMIC BEHAVIOR OF BURIED PIPES: METHODOLOGY AND COMPUTATIONAL IMPLEMENTATION / COMPORTAMENTO DINÂMICO DE DUTOS ENTERRADOS: METODOLOGIA E IMPLEMENTAÇÃO COMPUTACIONAL
This work presents a numerical methodology for the analysis of buried pipes employed by the transport of oil and gas subject to dynamic loads. Emphasis is given to seismic loads. A finite element model based on a special class of beam element for the pipe representation is employed. Both geometric and material nonlinearities are considered in a total Lagrang
Publicado em: 2008
-
16. DYNAMIC ANALYSIS OF A GEOSYNTHETIC REINFORCED EMBANKMENT / ANÁLISE DINÂMICA DE UM ATERRO REFORÇADO COM GEOSSINTÉTICOS
The main objective of this research is to investigate the seismic response of a soil slope reinforced with geosynthetics, located in an active seismic region of Peru. The 10.40m high slope was reinforced with 9 horizontal layers of geosynthetics 10m long. The aspects studied in this work are related to the slope static stability, the dynamic response of the
Publicado em: 2008
-
17. Um modelo geometricamente exato de barras com grandes deformações, que considera a distorção e o empenamento geral da seção transversal, e sua discretização pelo método dos elementos finitos. / A fully nonlinear geometrically exact multi-parameter rod model that incorporates general in-plane and out-of-plane cross-sectional changes, and its discretization by Finite Element Method.
The main purpose of this work is to present a fully nonlinear geometrically-exact multi-parameter rod model that incorporates general in-plane cross-sectional changes as well as general out-of-plane cross-sectional warping. The formulation constitutes an extension of the earlier works presented in [1] to [6], [8] and [9], in the sense that the restrictions t
Publicado em: 2008
-
18. Análises tridimensionais de barragens de enrocamento com face de concreto com objetivo de otimizar os critérios de projeto
Concrete Face Rockfill Dams (CFRD) have been constructed with increasing frequency all around the world. However, design criteria still are mostly empirical and based on practical experience obtained during the construction of this type of dam. The use of numerical analyses is not yet a usual tool in the development and design of CFRD. Aiming to reduce the d
Publicado em: 2007
-
19. 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
-
20. Avaliação numérico-experimental da fratura dúctil em processos predominantementetrativos e compressivos
Failure prediction in fracture-free materials under a general stress-strain path has posed a great challenge to researchers. Despite the fact that numerical assessment of ductile failure under tensile stress states has been reasonably well described in the literature, a definition of a failure criterion or modelling approach capable to successfully predict f
Publicado em: 2006
-
21. Modelagem hidro-mecÃnica dos solos colapsÃveis de PetrolÃndia / Hydro-mechanical modeling of PetrolÃndia collapsible soil
This dissertation aims to reproduce the collapse behavior by hydration of a collapsible soil of PetrolÃndia municipality through a coupled hydro-mechanical modeling by finite element method. The experimental site was in an agricultural school which presented damages caused by collapse of the foundation soil. Souza Neto (2004) carried out a series of laborat
Publicado em: 2006
-
22. 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
-
23. A continuum damage model for the stress corrosion cracking of austenitic stainless steel
In the present work, the mechanical behavior of stress corrosion cracking phenomenon is described. Such phenomenon presents strong complexity due to metallurgic and electrochemical aspects. A methodology for modeling both SSR (Slow Strain Rate) and CL (Constant Load) tests based upon thermodynamics of continuum solids and elastoplastic damage is proposed. In
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-06
-
24. A COUPLED MODEL FOR TWO-PHASE FLOW THROUGH ELASTOPLASTIC POROUS MEDIA / UM MODELO ACOPLADO PARA FLUXO BIFÁSICO EM MEIOS POROSOS ELASTOPLÁSTICOS
This dissertation studies a coupled flow and deformation model for saturated and non-saturated soils, based on Biot`s theory but taking into account the nonlinear material behavior of soil. In the non-saturated condition the fluid flow can be considered either as a two-phase or an one-phase problem. In the two-phase case, the model calculates the pressure of
Publicado em: 2005