Stress Intensity Factor
Mostrando 13-24 de 41 artigos, teses e dissertações.
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13. Quasi-static numerical study of the breathing mechanism of an elliptical crack in an unbalanced rotating shaft
In this paper we present the numerical analysis of the quasi-static behavior of an unbalance cracked shaft with straight and elliptical cracks considering an eccentric mass. The rotation of the shaft has been simulated by considering different angular positions to complete one rotation. The influence of the mass eccentricity in the opening of the crack has b
Lat. Am. j. solids struct.. Publicado em: 2014
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14. Estudo da corrosão e corrosão-fadiga em ligas de Al e Al - Li de alta resistência para aplicação aeronáutica / Study behaviour of corrosion and corrosion fatigue in high strength Al and Al - Li alloys for aeronautic application
The aircraft industry is constantly looking for improved materials which offer benefits in terms of performance, weight and cost savings. Corrosion and fatigue of aluminium alloys are major issues in the service life assessment of aircraft structures and in the management of aging air fleets. The aim of this study was to evaluate the corrosion and corrosion
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/09/2012
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15. Prognostic value of urethral mobility and valsalva leak point pressure for female transobturator sling procedure
PURPOSE: To analyze the influence of urethral mobility and Valsalva leak point pressure on postoperative outcomes of transobturator sling (TOT) for female stress urinary incontinence. MATERIALS AND METHODS: A prospective cohort was conducted including 66 patients submitted to TOT from March 2006 to May 2009. Urethral hypermobility was defined as mobility ≥
Int. braz j urol.. Publicado em: 2012-10
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16. Transpiration rate response to water deficit during vegetative and reproductive phases of upland rice cultivars.
Water deficit is one of the most important abiotic stress limiting upland rice yield in the ?Cerrado? region of Brazil. Selecting drought tolerant cultivars is an important strategy to overcome this constraint. Two greenhouse experiments were conducted at Santo Antônio de Goiás, state of Goiás, Brazil, to compare the response of normalized transpiration r
Scientia Agricola. Publicado em: 2011
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17. Um novo algoritmo para modelagem de mecânica da fratura usando o método dos elementos de contorno. / A novel algorithm fot the modeling of fracture mechanics using the boundary element method.
Este trabalho trata da análise de problemas da Mecânica da Fratura Elástica Linear (MFEL) utilizando o Método dos Elementos de Contorno (MEC). Esse método constitui uma poderosa e precisa técnica de análise numérica. A necessidade da discretização somente do contorno do modelo é um dos grandes atrativos do MEC. Na Mecânica da Fratura, o MEC é ad
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/03/2010
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18. Emprego de formulações não-convencionais de elementos finitos na análise linear bidimensional de sólidos com múltiplas fissuras / Use of non-conventional formulations of finite element method in the analysis of linear two-dimensional solids with multiple cracks
O trabalho trata da utilização de formulações não-convencionais de elementos finitos na obtenção de fatores de intensidade de tensão associados a múltiplas fissuras distribuídas num domínio bidimensional. A formulação do problema de múltiplas fissuras baseia-se numa abordagem de sobreposição proposta pelo Método da Partição ("Splitting Met
Publicado em: 2010
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19. Estudo de efetividade de intervenção psicológica de apoio na prevenção de sintomas de transtorno de estresse pós-traumático em pacientes submetidos à sedação e internados em Unidade de Terapia Intensiva / Effectiveness study of support psychological intervention in the prevention of posttraumatic stress disorder in intensive care unit sedated patients.
Goal: To evaluate the effectiveness of support psychological intervention in the prevention of Posttraumatic Stress Disorder (PTSD) in intensive care unit (ICU) sedated patients. Method: Randomized controlled clinical trial (treatment group G1 and control group G2). Adult sedated patients in ICU for more than 24 hours and with a history of delusional memorie
Publicado em: 2010
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20. Formulação dual em mecânica da fratura utilizando elementos de contorno curvos de ordem qualquer / Dual boundary element formulation in fracture mechanics using curved element of any order
This work presents the dual boundary element formulation applied to linear crack problem. The goal of this research is the evaluation of stress intensity factor for two-dimensional crack problem using three different techniques, which are: the technique of correlation of displacements, the technique based on the state of tension at the crack tip and J integr
Publicado em: 2009
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21. Psychological stress and recurrent aphthous stomatitis
INTRODUCTION AND OBJECTIVES: Recurrent aphthous stomatitis (RAS) is the most common type of ulcerative disease of the oral mucosa. Despite its worldwide occurrence and the extensive amount of research that has been devoted to the subject, the etiology of RAS remains unclear. Nevertheless, several hereditary, nutritional, infectious and psychological factors
Clinics. Publicado em: 2009
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22. On the prediction of fatigue crack retardation using Wheeler and Willenborg models
The aim of this work is to evaluate the applicability of the Wheeler and Willenborg models to predicting fatigue crack growth retardation in a flash welded structural steel subjected to a single overload during constant amplitude (CA) fatigue crack propagation test. Compact tension specimens, in different microstructural conditions, were subjected to a singl
Materials Research. Publicado em: 2007-06
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23. EFEITO DA TENSÃO NOMINAL NO TAMANHO E FORMA DA ZONA PLÁSTICA / THE ESTIMATES OF THE SIZE AND SHAPE OF THE PLASTIC ZONES, TRADITIONALLY USED IN THE NOMINAL STRESS IN FRACTURE MECHANICS
The estimates of the size and shape of the plastic zones, traditionally used in Linear Elastic Fracture Mechanics (LEFM), are based on the supposition that the stress intensity factor (SIF) KI (or KII or KIII) is the only necessary parameter to describe them. However, when the linear elastic stress analysis problem is solved in an Inglis plate, or the cracke
Publicado em: 2007
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24. Rainfall retention in straw, plant and soil in corn and drybeans / Retenção de água da chuva na palha, solo e dossel vegetativo de milho e feijão
The water is the most important factor and, at the same time, the more limitant than the plant needs for its development. Short periods of hidric stress can reduce crop productivity. In this way, the importance of knowing the rainfall amount that is retained in plant, straw and soil is fundamental to calculating the exact amount of water requested by the pla
Publicado em: 2007