Isotropic Damage
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Progressive failure prediction of pinned joint in quasi-isotropic laminates used in pipelines
Abstract To simulate the progressive failure of pinned joint in quasi-isotropic [0/45/-45/90]s glass fiber reinforced polymer (GFRP) composite laminates used in pipeline, 3-D finite element model is employed in the present work. Hashin failure criterion as a progressive damage model associated with Virtual-Crack-Closing-Technique (VCCT) delamination model h
Lat. Am. j. solids struct.. Publicado em: 02/07/2018
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2. Continuum Structural Layout in Consideration of the Balance of the Safety and the Properties of Structures
Abstract In the article, a new approach considering structural local failure for topology optimization of continuum structure is proposed. It aims at not only lowering the risk of local failure in the concerned structural regions, but also ensuring a good stiffness of the structure. The local failure may be caused by the structural uncertainties or possible
Lat. Am. j. solids struct.. Publicado em: 2017-06
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3. A New Approach for Severity Estimation of Transversal Cracks in Multi-layered Beams
Abstract Nowadays, the damage severity evaluation in mechanical structures is mostly performed by analyzing the natural frequency shift. The non-isotropic materials, as the multi-layered ones, are wide-spread in industrial applications, due to their interesting physic-mechanical properties. Thus, a deeper approach of multi-layered beams becomes an important
Lat. Am. j. solids struct.. Publicado em: 2016-08
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4. Dispersion of Love wave in an isotropic layer sandwiched between orthotropic and prestressed inhomogeneous half-spaces
Abstract An in-depth study has been carried out for the dispersion of Love waves in an isotropic elastic layer sandwiched between orthotropic and prestressed inhomogeneous elastic half-spaces. The inhomogeneities in density and rigidity of the lower half-space are space dependent and an arbitrary function of depth. Simple mathematical techniques are used to
Lat. Am. j. solids struct.. Publicado em: 2015-10
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5. An isotropic damage model to simulate collapse in reinforced concrete elements
A damage model with different failure surface in tension and compression is formulated, implemented and validated to study reinforced concrete elements under actions which induce their collapse. The constitutive behaviour of concrete considers the softening deformation after reaching a failure surface, whereas the hardening of the reinforcing steel is repres
Lat. Am. j. solids struct.. Publicado em: 2014
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6. Isotropic damage phenomena in saturated porous media: a bem formulation / Dano isotrópico em meios porosos saturados: uma formulação do método dos elementos de contorno
This work is devoted to the numerical analysis of saturated porous media, taking into account the damage phenomenon on the solid skeleton. The porous media is taken into poroelastic framework, in full-saturated condition, based on the Biots Theory. A scalar damage model is assumed for this analysis. An implicit Boundary Element Method (BEM) formulation, base
Publicado em: 2011
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7. ImplementaÃÃo e AplicaÃÃo do Modelo de Visco-dano para problemas geomecÃnicos
A great advance in development of constitutive models for better simulation of geomechanical materials behavior has been observed in the last decades. A continuous medium subjected to degradation of its mechanical properties has a differentiated constitutive answer; hence itâs required the adoption of models based in Mechanic of Continuous Damage formulated
Publicado em: 2008
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8. Estudo de traços de fissão em vidro utilizando-se microscopias de força atomica e eletronica de varredura : inferencia da estrutura de traços latentes a partir de traços atacados / Glass fission track analysis by AFM and SEM : inferring latent track structure trough etched tracks
A study on the geometric evolution of 235U induced fission tracks in a soda-lime glass was made. It was necessary to know about the geometric model for structure evolution of fission tracks in isotropic materials. This model is based on the competition of two chemical etching rates: one in the bulk material (VB) and another in each fragment trajectory (VT).
Publicado em: 2008
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9. ImplementaÃÃo de modelo de dano isotrÃpico aplicado a problemas acoplados hidro-geomecÃnicos
The macroscopic behaviour of a material can be described by constitutive models able to capture the structure observed along the application of several mechanical loading steps. The constitutive behaviour of a bedrock medium shows that for some stress levels hydromechanical models, based in poro-elasticity theories, represent in a satisfactory way the stress
Publicado em: 2007
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10. Aplicação do método dos elementos de contorno à análise de pavimentos de edifícios / Application of the boundary element method to slab floor analysis
This work deals with a formulation of the boundary element method applied to slab floor analysis with special emphasis concrete flat slabs exhibiting physical non-linearities. In this formulation normal and shear components of the stress tensor are taken into account to capture more accurately the ultimate strength of the structural element. The boundary ele
Publicado em: 2001
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11. Recombinant superoxide dismutase reduces oxygen free radical concentrations in reperfused myocardium.
It has been proposed that oxygen free radicals mediate damage that occurs during postischemic reperfusion. Recombinant human superoxide dismutase (r-h-SOD) has been shown to be effective at reducing reperfusion injury, but it is not known if this infused enzyme actually reduces oxygen free radical concentrations in the myocardial tissue. Electron paramagneti