Constitutive Models
Mostrando 25-36 de 145 artigos, teses e dissertações.
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25. A characterization for the constitutive relationships of 42CrMo high strength steel by Artificial Neural Network and its application in isothermal deformation
In hot working process, the prediction of material constitutive relationship can improve the optimization design process. Recently, the artificial neural network models are considered as a powerful tool to describe the elevated temperature deformation behavior of materials. Based on the experimental data from the isothermal compressions of 42CrMo high streng
Mat. Res.. Publicado em: 05/08/2014
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26. Experimental investigation of the mechanical properties of ZAR-345 cold-formed steel at elevated temperatures
Considering the technical-scientific advances of recent years in the steel construction industry, there is a strong trend for the increasing use of cold-formed steel members in civil construction, due to several advantages such as cost and versatility of fabrication and erection. However, there is need for further study concerning the behavior of this type o
Mat. Res.. Publicado em: 01/08/2014
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27. Modified couple stress-based third-order theory for nonlinear analysis of functionally graded beams
A microstructure-dependent nonlinear third-order beam theory which accounts for through-thickness power-law variation of a two-constituent material is developed using Hamilton's principle. The formulation is based on a modified couple stress theory, power-law variation of the material, and the von Kármán nonlinear strains. The modified couple stress theory
Lat. Am. j. solids struct.. Publicado em: 2014-05
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28. Linear and non-linear finite element analysis of shear-corrected composites box beams
The Updated Lagrangian formulation for non-linear finite element analysis is applied to the problem of thin-walled composites box beams undergoing large displacements. A shear correction factor for thin-closed rectangular sections is introduced into some terms of the variational formulation and its influence in the results is analyzed, in both linear and non
Lat. Am. j. solids struct.. Publicado em: 2013-07
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29. Determination of the rheological properties of thin plate under transient vibration
The article deals with systematic analysis of the transient vibration of rectangular viscoelastic orthotropic thin 2D plate. The analysis is focused on specific deformation models of plate and for specific linear models of rheological properties. The viscoelastic isotropic and anisotropic (orthotropic) materials were investigated. The plate is loaded by gene
Lat. Am. j. solids struct.. Publicado em: 2013-01
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30. Modelagem numérica de escavações de túneis em maciços evaporíticos / Numerical modeling of tunnel excavation in solid evaporite
A precaução com a ruína em um material geológico submetido a altas tensões é um problema bastante comum na Geotecnia. Em um túnel, por exemplo, durante a escavação, é possível gerar uma perda de equilíbrio que pode levar à ruptura, fechamento e perda do mesmo. Quando a perfuração é feita em um maciço com características de deformabilidade d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2012
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31. Sobre modelos constitutivos não lineares para materiais com gradação funcional exibindo grandes deformações: implementação numérica em formulação não linear geométrica / On nonlinear constitutive models for functionally graded materials exhibiting large strains: numerical implementation in geometrically nonlinear formulation
O objetivo precípuo deste estudo é a implementação computacional de modelos constitutivos elásticos e elastoplásticos para materiais com gradação funcional em regime de grandes deslocamentos e elevadas deformações. Para simular numericamente um problema estrutural, são empregados aqui elementos finitos sólidos (tetraédrico e hexaédrico) com ord
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/04/2012
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32. Modelos numéricos de vigas mistas de aço e concreto pertencentes a sistemas de pisos mistos de pequena altura em situação de incêndio / Numerical modelling of composite slim floor beams in fire
Slim floor frames consists on structural system in which the steel beam is completely or partially inserted in a concrete slab, that is usually used in profiled steel decks systems. The main goal of the slim floor systems is to obtain a minimum height of the composite beam section and, consequently, achieve a higher height of the floor or a lower total heigh
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/03/2012
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33. Experimental investigation on the yield behavior of Nomex honeycombs under combined shear-compression
This paper presents an experimental investigation on the yield behavior of Nomex honeycombs under combined shearcompression with regard to out-of-plane direction. Four different types of specimens were designed in order to investigate the influence of in-plane orientation angle on the yield behavior of honeycombs under combined loads. Two different failure m
Lat. Am. j. solids struct.. Publicado em: 2012-08
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34. Geometrically non-linear analysis of inclined elastic rods subjected to self-weight
The behavior of inclined slender elastic rods subjected to axial forces and distributed load is discussed in this paper. Mathematical models and numerical solutions are developed for small and large displacements. A double-hinged boundary condition is assumed and the analysis is carried out for different values of non-dimensional weight (distributed load) an
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-03
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35. A produção dos espaços dos cerrados baianos após 1970.
This paper presents a study about the capitalist production of a space. It focuses on how the region of savannas in Bahia was planned and produced to be part of a new capitalist dynamic. The study analyzes since the end of the 1970s until now, once that the consolidation of modern agriculture in the space took place exactly in this period. This new process h
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/07/2011
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36. Desenvolvimento econômico e mudança estrutural:: teoria e evidência a partir de um enfoque multi-setorial
The objective of this dissertation is to analyze the relationship between the development of a National Innovation System (NIS) and the acceleration of the structural change and technological learning, which are the motors of economic development with balance of payment equilibrium. Along the dissertation we seek to trace a broad representation of the workin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/05/2011