Weibull Stress
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Microstructure and Weibull distribution of rupture strength of clay-talc ceramics
Resumo As propriedades mecânicas das cerâmicas de argila-talco contendo 0 a 10% em massa de talco sinterizadas a 1100 °C foram obtidas por medidas de flexão. Com o valor médio de resistência à flexão de 23,1 MPa, a amostra com 5% de talco (G5) foi a mais forte e apresentou o menor valor de poro interconectado (64%). A dispersão dos valores de resist
Cerâmica. Publicado em: 06/06/2019
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2. Fatigue Failure Analysis on Precracked 304 Stainless Steel Components Repaired by Laser with Addition of Nanocomposites
Abstract The service life of components can be extended by repairing fatigue crack with laser so as to improve resource utilization rate. However, the effect of laser repair may be influenced by the instability of laser treatment. To investigate the addition of nanocomposites on the laser repairing effect, fatigue test under uniaxial tension was carried out
Soldag. insp.. Publicado em: 16/05/2019
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3. On the creep behavior of carbon/epoxy non-crimp fabric composites
The use of composites in structural applications requires the study of specific properties to ensure that these materials are safe and an excellent option to replace some metals, for example. In the present study, vacuum assisted resin transfer molding (VARTM) was used prior to obtain carbon/epoxy non-crimp fabric composites. Dynamic mechanical analysis and
Mat. Res.. Publicado em: 26/02/2018
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4. Effect of the Cooling Rate on the Properties of Veneer Porcelain for Zirconia Dental Prosthesis
To solve chipping of veneer porcelain in zirconia dental prosthesis it has been studied different cooling rates in firing schedules to control residual stresses generated by differences in thermal properties between the ceramics. However, cooling rates may affect the porcelain, irrespectively of interaction with zirconia. This study analyzed the effect of co
Mat. Res.. Publicado em: 07/08/2017
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5. Tensile Properties and Fracture Reliability of Melt-extracted Gd-rich Amorphous Wires
Gd60Al20Co20 amorphous wires with smooth surfaces and circular cross-sections were fabricated by a melt-extraction technique. The mechanical properties of the extracted microwires were evaluated by tensile tests and their fracture reliability was estimated by using Lognormal and two- or three- parameter Weibull analysis, respectively. The microwires exhibit
Mat. Res.. Publicado em: 17/11/2015
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6. Efeito do envelhecimento por ciclagem mecânica sobre a resistência à flexão de cerâmicas odontológicas / Effect of aging by mechanical cycling on the flexural strength of dental ceramics
The objectives of this study were: 1) To evaluate the effect of aging by mechanical cycling (1 million cycles at a frequency of 2 Hz) on the biaxial flexural strength of three dental ceramics used as framework materials for fixed partial dentures (FPDs): a) yttria partially stabilized zirconia tetragonal polycrystals (Y-TZP), b) alumina polycrystals (AL) and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/07/2011
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7. A micromechanics approach to assess effects of constraint on cleavage fracture toughness: a weibull stress model
This work describes an engineering methodology incorporating the statistics of microcracks and a probability distribution of the (local) fracture stress to assess the effects of constraint loss and weld strength mismatch on crack-tip driving forces. One purpose of this investigation is to establish a definite fracture assessment framework capable of providin
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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8. 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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9. Selection of high strength natural fibers
By means of dimensional selection of natural lignocellulosic fibers, based on precise diameter measurements, it was recently possible to obtain fibers with relatively higher tensile strength. The present article overviews works on the statistical evaluation, through the Weibull analysis, of the ultimate tensile stress of eight lignocellulosic fibers: sisal,
Matéria (Rio de Janeiro). Publicado em: 2010
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10. PARÂMETROS DE IRRIGAÇÃO POR ANÁLISE NUMÉRICA PARA A CULTURA DO MILHO NA REGIÃO CENTRAL DO RIO GRANDE DO SUL / PARAMETERS OF IRRIGATION BY NUMERICAL ANALYSIS FOR MAIZE IN THE CENTRAL AREA OF RIO GRANDE DO SUL
O milho é uma das principais culturas da Agricultura Brasileira. A cultura sofre grandes perdas quando submetida a deficiência hídrica. Para contornar esse problema e evitar a baixa disponibilidade de água no solo, a irrigação do milho é a principal alternativa. Mas para isso ocorrer de forma satisfatória é necessário conhecer os parâmetros de irr
Publicado em: 2009
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11. Efeitos de heterogeneidades mecânicas sobre forças motrizes de trinca em juntas soldadas: determinação experimental de tenacidade e extensão de metodologias de avaliação de criticidade de defeitos. / Effects of weld strength mismatch on crack tip driving forces of welded joints: experimental evaluation of fracture toughness and extension of methodologies for integrity assessment.
Este trabalho apresenta uma avaliação dos efeitos de juntas soldadas dissimilares sobre forças motrizes de trinca e o desenvolvimento de procedimentos adaptados baseados em critérios mecânicos e micromecânicos para avaliação de defeitos em juntas soldadas incorporando efeitos de dissimilaridades mecânicas. A motivação central reside na forte expan
Publicado em: 2008
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12. Time to failure assessment of products at service conditions from accelerated lifetime tests with stress-dependent spread in life
Em testes acelerados de vida (ALT) a suposição de que a dispersão do tempo de falha é independente do stress é freqüentemente empregada e aceita pois os modelos resultantes são tipicamente mais fáceis de utilizar e dados ou experiência adquirida sugerem que tal simplificação é algumas vezes válida. Entretanto, em muitas situações e para uma va
Pesquisa Operacional. Publicado em: 2007-08