Fatigue Cycling
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Amplitude-Dependent Internal Friction Study of Fatigue Deterioration in Carbon Fiber Reinforced Plastic Laminates
The amplitude-dependent internal friction in carbon fiber reinforced plastic (CFRP) laminates subjected to fatigue cycling has been measured and analyzed to convert into the plastic strain of the order of 10-8 as a function of effective stress. The microplastic flow indeed occurs in the stress range three orders of magnitude lower than the failure stress, an
Mat. Res.. Publicado em: 07/06/2018
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2. Influence of central obesity in estimating maximal oxygen uptake
OBJECTIVE: To assess the influence of central obesity on the magnitude of the error of estimate of maximal oxygen uptake in maximal cycling exercise testing. METHOD: A total of 1,715 adults (68% men) between 18-91 years of age underwent cardiopulmonary exercise testing using a progressive protocol to volitional fatigue. Subjects were stratified by central
Clinics. Publicado em: 2016-11
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3. ANÁLISE DE SOBREVIDA E RESISTÊNCIA À FRATURA DE RAÍZES FRAGILIZADAS RESTAURADAS COM DIFERENTES PINOS INTRARRADICULARES / SURVIVAL ANALYSIS AND FRACTURE RESISTANCE OF WEAKENED ROOTS RESTORED WITH DIFFERENT SYSTEMS POSTS
Objetivos: Avaliar a sobrevida e a resistência à fratura de raízes fragilizadas e não fragilizadas restauradas com diferentes pinos intracanais. Métodos: oitenta incisivos bovinos foram seccionados em 16 mm e preparados em 12 mm com brocas padronizadas. 50 raízes foram fragilizadas com ponta diamantada mantendo 0,5 mm de espessura e 6 mm intra canal e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2012
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4. Avaliação da resitência de união de pinos de fibra de vidro cimentados com diferentes protocolos adesivos e submetidos à ciclagem mecânica / Evaluation of the bond strength of fiber posts cemented with different adhesives protocols and submitted to cycling loading
The objective of this study was to evaluate in vitro the bond strength of intracanal posts cemented using different adhesive protocols and not submitted to mechanical cycling. 80 roots were selected from bovine incisors with similar dimensions, which are included in polystyrene resin. The bodies of the test piece were divided into 10 experimental groups (n =
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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5. Tensiones residuales en uniones soldadas por FSW en aluminio 7075-T651
Residual stresses could be a relevant issue in the structural integrity of a component in service and usually have a major influence on their fatigue life, among other failure mechanisms. In recent years Friction-Stir Welding (FSW) has revolutionized the welding technology. Its main application has been given in aluminum alloys, but nowadays can be applicabl
Soldag. insp.. Publicado em: 2012-12
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6. Mechanical behavior of non veneered three unit fixed partial dentures of alumina-zirconia Under cyclic load in wet environment
The aim of this study was to evaluate the fatigue behavior in wet environment of a ZTA three unit FPDs processed via CAD-CAM. Thirty four three unit FPDs (In-Ceram®Zirconia BZ blanks) were grinded through a CEREC In-Lab equipment followed by glass infiltration and sandblasting. Those frameworks were then submitted to different number of load cycles (400 N,
Materials Research. Publicado em: 2010-03
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7. Mechanical behavior of ceramic materials used for fixed partial dentures / Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas
Objectives: to determine the flexural strength (f), Weibull modulus (m), slow crack growth coefficient (n) and fracture toughness (KIC) of three ceramics used as framework materials for fixed partial dentures (FPDs) (YZ- yttria partially stabilized zirconia tetragonal polycrystals; IZ- alumina-based zirconia-reinforced glass infiltrated ceramic; AL alumina p
Publicado em: 2010
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8. Evaluation of failure mode of ceramic crowns with and without framework design modification. / Avaliação do modo de falha de coroas cerâmicas com e sem alteração do desenho das infraestruturas
Ceramic crowns have been widely used, however, problems related to brittle fracture of these materials persist, especially in the posterior area. The present study tested the null hypothesis that there were no differences in fatigue resistance related to the framework design as well as to the materials used. One maxillary molar was prepared, reproducing the
Publicado em: 2009
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9. Atividade eletromiográfica e força muscular de membros inferiores durante o ciclismo até a exaustão em atletas competitivos
A fadiga muscular pode ser definida como a incapacidade de manutenção de um nível esperado de força para uma dada intensidade, o que envolve um processo complexo reunindo fatores fisiológicos, biomecânicos e psicológicos. O objetivo deste trabalho foi investigar o efeito da fadiga sobre variáveis biomecânicas no ciclismo. Para isso, dois estudos for
Publicado em: 2009
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10. Limiar de fadiga neuromuscular determinado por diferentes periodos de analise do sinal eletromiografico / Neuromuscular fatigue threshold established by different analysis periods of electromyography signs
The purpose of this study was to establish the Neuromuscular Fatigue Threshold - LFNM determinied by different analysis periods of electromyography sign and compare to the Critical Power - CP in healthy young men. 17 healthy men volunteers (23,4 ± 5,2 years, 73,6 ± 5,08 kg, 177,8 ± 7,0 cm) completed three or four constant loads tests on a cycling ergomete
Publicado em: 2008
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11. Estudo de propagaÃÃo de fratura em compÃsitos odontolÃgicos utilizando tomografia por coerÃncia Ãptica / Crack propagation study in dental composites by optical coherence tomography
Contemporary approaches to fatigue principles consider a fracture process in three phases: crack initiation, slow crack growth, and fast fracture. The purpose of this study was to analyze the sites of fracture initiation and slow crack propagation in a fiber reinforced composite, using images produced by the optical coherence tomography. The traditional micr
Publicado em: 2008
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12. Avaliação da fadiga no ciclismo por meio da análise dos momentos articulares resultantes / Fatigue evaluation by means of the analisys of resultant joint moments
O processo de instalação da fadiga implica na mudança do padrão coordenativo durante a pedalada. Desta forma a análise da contribuição de cada articulação do membro inferior para o somatório absoluto dos momentos articulares se faz necessária para o melhor entendimento dos mecanismos relacionados aos efeitos do processo de instalação da fadiga s
Publicado em: 2008