Fatigue Of Metals
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Estudo da análise de fadiga pelo MEF considerando os efeitos da estampagem / Study of fatigue analysis by FEM considering the metal stamping effects
As simulações dentro do ambiente de projeto devem prever a utilização de novas variáveis, especialmente de processos, de forma a aumentar a proximidade entre os modelos virtual e real e, com isso, aumentar a precisão das simulações. O objetivo deste trabalho foi o de estudar um modelo pelo Método dos Elementos Finitos que incluísse os efeitos da va
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/07/2011
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2. Effects of microstructure on the fatigue crack growth behavior of light metals and design considerations
Fatigue crack growth mechanisms of long and small cracks were investigated in cast and wrought aluminum and titanium alloys with various microstructures (as-cast A535, 6061-T61, and mill-and beta annealed Ti-6Al-4V). In addition, friction stir welded and cold spray processed 6061-T61 were also investigated. The effects of microstructure on the fatigue crack
Matéria (Rio de Janeiro). Publicado em: 2010
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3. Obtaining and microstructualand mechanical characterization of Ti-Nb-Sn alloys applied as biomaterial / Obtenção, caracterização microestrutural e mecanica de ligas Ti-Nb-Sn aplicadas em implantes ortopedicos
This work deals with preparation, processing and microstructural and mechanical characterization of ß type Ti-Nb-Sn alloys aiming the manufacturing of orthopedic devices for implants. Ti samples containing Nb at levels of 25, 30 and 35 wt % and Sn at levels of 2, 4 and 8 wt % were prepared by arc melting, homogenized at 1000ºC/8 h and plastically deformed
Publicado em: 2009
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4. 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
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5. CONTROLE POR APRENDIZADO DE SISTEMAS SERVO: HIDRÁULICOS DE ALTA FREQÜÊNCIA / LEARNING CONTROL OF HIGH FREQUENCY SERVO: HYDRAULIC SYSTEMS
Hydraulic systems are used where relatively high forces and torques are required, or when high response speeds are necessary. They are used in industrial systems, robotics, movement simulators, automated plants, ore exploration, presses, and especially in fatigue testing systems. Fatigue tests are usually performed on servo-hydraulic systems, in order to pre
Publicado em: 2008
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6. AnÃlise de fadiga em juntas soldadas pelo processo MIG/LASER utilizando o mÃtodo dos elementos finitos / Fatigue Analysis of MIG/Laser Welded Joints with the Finite Element Method
The objective of this work is to deal with the analysis of MIG/Laser welded joints. The analysis method chosen is the Master S-N Curve Method, which is based on fracture mechanics principles and uses finite element results as inputs. This method was chosen due to the fact that it has been adopted by American Society of Mechanical Engineers (ASME) for develop
Publicado em: 2006
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7. Talinum patens: Análise por ativação neutrônica instrumental e prospecção fitoquímica
The use of plants for many diseases treatment is a millenary knowledge. These are the great importance for the formation of actual medicine bases. Actually, more than 25 % of the all drugs prescribed in the world are obtained from plants. The medicinal plants and other vegetable materials market reach to around two billions dollars. The researches of natural
Publicado em: 2005
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8. Resistencia a fadiga do titanio comercialmente puro e de liga Ti-6Al-4V em diferentes meios de armazenagem / Fatigue strength of commercially pure titanium and TI-6Al-4V alloy in different storage media
The fatigue is responsible for 90% of metallic component failures during service. This phenomenon is closely related to superficial alteration and it occurs during cyclic stress application. Removable partial dentures (RPDs) are affected by fatigue due to cyclic mechanism of the masticatory system and the frequent insertion and removal. Because of unique and
Publicado em: 1999
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9. Fatigue properties of high strength low alloy steel weld metals with different microstructural composition. / Propriedades de fadiga de soldas de alta resistência e baixa liga com diferentes composições microestruturais.
Foram estudadas as propriedades de fadiga em dois grupos de soldas de alta resistência e baixa liga com diferentes composições microestruturais. As soldas do grupo A apresentaram microestruturas compostas de ferrita acicular, ferrita alotriomórfica e ferrita de Widmanstätten, com limite de escoamento de aproximadamente 460 MPa, enquanto que as soldas do
Publicado em: 1999
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10. Avaliação da tenacidade à fratura de soldas de alta resistência e baixa liga pelo método da integral-J. / Evaluation of high strength low alloy steel weld metal fracture toughness using the J-integral method.
The influence of the microstructure on the fracture toughness behaviour of two groups of multipass High Strength Low Alloy (HSLA) steel weld metals, presenting different microstructure composition, was evaluated. The weld metals A1/A2 exhibited a microstructure composed by acicular ferrite, allotriomorphic ferrite, Widmanstätten ferrite and microphases, and
Publicado em: 1998
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11. FATIGUE CRACK NUCLEATION IN METALS*
One of the unanswered questions in the study of fatigue is how cracks nucleate at stresses far below the static fracture strength. Previous theories show possible qualitative mechanisms that may operate in a crystal at room and low temperatures but none provides a quantitiative theory of this phenomenon. We show here a quantitative mechanism of fatigue crack