Elasto Plasticity
Mostrando 1-12 de 16 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. Algorithmic Formulations of Evolutionary Anisotropic Plasticity Models Based on Non-Associated Flow Rule
Abstract In the present paper, orthotropic elasto-plastic constitutive formulations for sheet metal forming based on non-associated flow rule that assume distortion of yield function/plastic potential with ongoing deformation process are analyzed. The yield function/plastic potential are considered as two different functions with functional form as orthotrop
Lat. Am. j. solids struct.. Publicado em: 2017-10
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3. Determination of the reinforced concrete slabs ultimate load using finite element method and mathematical programming
In the present paper, the ultimate load of the reinforced concrete slabs [16] is determined using the finite element method and mathematical programming. The acting efforts and displacements in the slab are obtained by a perfect elasto-plastic analysis developed by finite element method. In the perfect elasto-plastic analysis the Newton-Raphson method [20] i
Latin American Journal of Solids and Structures. Publicado em: 2012
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4. Efeitos acoplados da temperatura e evolução de dano em meios contínuos elasto-plásticos / Damage evolution and thermal coupled effects in elastoplastic solids
O surgimento de novos materiais, aliado ao aumento da demanda industrial por ferramentas numéricas capazes de prever o aparecimento de defeitos em processos de conformação mecânica, tem estimulado o desenvolvimento de novos modelos materiais. A Mecânica do Dano Contínuo, em cujo contexto este trabalho está inserido, provou ser uma abordagem capaz de p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/07/2011
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5. 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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6. Boundary element method formulation for reinforced porous material / Formulação do método dos elementos de contorno para materiais porosos reforçados
In this work a nonlinear formulation of the boundary element method (BEM) is proposed to deal with saturated and unsaturated poro-elasto-plastic 2D reinforced domains. To model reinforced porous domains a BEM/FEM (Finite Element Method) modified coupling technique is employed. The coupling is made by using the least square method to regularize the displaceme
Publicado em: 2008
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7. Análise limite de estruturas através de uma formulação em elasticidade não-linear
A avaliação numérica das cargas limites (de colapso) de estruturas é obtida geralmente ou pela aplicação direta dos teoremas de análise limite junto com processos de otimização ou mediante análises incrementais, que levam em consideração o comportamento elasto-plástico do material. Entretanto, ambas as estratégias conduzem eventualmente a dific
Publicado em: 2008
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8. Boundary element analysis of thin walled piece in elasto-plastic regimen under transient dynamic effect / Uma formulação para analise de peças de seção delgada em regime elasto-plastico sob efeito dinamico transiente usando o metodo dos elementos de contorno
This work opens with a short summary of the formulations for analysis of plane elasticity, plate bending according to the theory due to Kirchhoff and some models of plasticity. The integral equations of plate bending and plane elasto-plastic problems are developed and its implementation on Boundary Element Method is discussed (BEM). Some time-step integrator
Publicado em: 2004
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9. Modelagem acoplada hidro-mecÃnica da perfuraÃÃo de poÃos em rochas frÃgeis
The thesis presents the first results of a research theme that is now going on the Civil Engineering Department of the Federal University of Pernambuco, which deals with wellbore stability in brittle rocks. The aim is to implement in a finite element code which solves simultaneously the stress equilibrium and the mass balance equation of pore fluid more real
Publicado em: 2004
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10. Chaotic motion of an elasto-plastic beam
The non-linear dynamics of a pin-ended elasto-plastic beam is discussed in this contribution. Ideal plasticity is in focus. Free and forced responses are considered. An iterative numerical procedure, based on the operator split technique, is developed. This work shows that jump phenomenon and sensitivity to initial conditions imply that the system response m
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-03
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11. ELASTO-PLASTIC ADAPTATIVE ANALYSIS FOR MODELING FRACTURE PROCESSES OF TWO-DIMENSIONAL STRUCTURES / ANÁLISIS ELASTO-PLÁSTICA ADAPTATIVA DE EXTRUCTURAS CON GRIETAS / ANÁLISE ELASTO-PLÁSTICA ADAPTATIVA DE ESTRUTURAS COM TRINCAS
A análise de problemas mecânicos e estruturais, pelo método dos elementos finitos,requer do analista certa experiência na discretização do modelo para minimizar os erros das soluções. A geração da malha é uma tarefa árdua, que torna- se ainda mais difícil quando trincas estão presentes no modelo. Em um modelo discreto, cada vez que a trinca pro
Publicado em: 1999
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12. DESIGN OF CONCRETE SLAB PANELS USING THE FINITE ELEMENT METHOD AND MATHEMATICAL PROGRAMMING / FERRAMENTAS COMPUTACIONAIS PARA O PROJETO DE LAJES DE CONCRETO ARMADO
In this work it is presented computational methodologies for the design of reinforced concrete massive slabs. The design of the slabs is made using an elastic and perfect elastoplastic analysis, an optimum design using mathematical programming and a plastic analysis project. The conventional project of reinforced concrete slabs has been made starting from ef
Publicado em: 1998