Dynamic Fracture Toughness
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Compensation technique for environmental and light source power variations applied in a polymer optical fiber curvature sensor for wearable devices
Abstract Introduction Polymer optical fibers (POF) are lightweight, present high elastic strain limits, fracture toughness, flexibility in bend, and are not influenced by electromagnetic fields. These characteristics enable the application of POF as curvature sensor and can overcome the limitations of the conventional technologies, especially for wearable a
Res. Biomed. Eng.. Publicado em: 05/03/2018
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2. 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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3. Instrumented Charpy : analysis of the instrumentation and the effect of different metallurgical conditions of an ultra-high strength steel on the dynamic fracture toughness / Charpy instrumentado : analise da instrumentação e da influencia de condições metalurgicas de um aço de ultra-alta resistencia mecanica na tenacidade a fratura dinamica
The classical Charpy test is used since 1900 and it is possible to determine from it the global energy for deformation and fracturing the specimen and this energy is named toughness which is important for selection steels considering ductile-brittle transition temperature. The Instrumented Charpy test is very important because it produces more material param
Publicado em: 2009
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4. Tenacidade à fratura translaminar dinâmica de um laminado híbrido metal-fibra titânio-grafite de grau aeronáutico / Dynamic translaminar fracture toughness of aeronautical grade titanium-graphite hybrid fiber-metal laminate
Several dynamic translaminar fracture toughness criteria have been determined for TiGr hybrid fiber-metal laminate through Linear Elastic (K-factor) and Elastic-Plastic (J-integral) Fracture Mechanics (LEFM and EPFM, respectively) concepts and methodologies. Instrumented Charpy impact testing was carried out over a wide range of temperatures under two loadin
Publicado em: 2009
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5. Estudo da fluência em vigas de concreto reforçado com fibras de aço, com aplicação de conceitos da mecânica da fratura / Creep analysis of steel fiber reinforced concrete based on beam tests and fracture mechanics concepts
Despite of the well known advantages of steel fiber addition to concrete (SFRC), especially the toughness improvement, only a few number of studies has been developed about creep on these composites. The main purpose of this research is to investigate the feasibility and inherent difficulties related to a particular creep evaluation method. This method is ba
Publicado em: 2008
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6. Crescimento de trinca subcrítico em cerâmicas odontológicas: efeito do material (microestrutura) e do método de ensaio / Growth of crack subcrítico in dental ceramics: effect of the material (Microstructure) and the test method
The objective of this study was to determine the mechanical properties and the microstructure of different dental ceramics in order to understand their influence on the slow crack growth (SCG) parameters, n (crack growth exponent) and ?f0, (scaling parameter), determined by different methods. The five ceramics tested were: porcelains VM7 (Vita) and D (d.Sign
Publicado em: 2007
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7. THE STRUCTURAL BEHAVIOUR OF COMPOSITE LAMINATES MANUFACTURED USING RESIN INFUSION UNDER FLEXIBLE TOOLING
This thesis presents a detailed investigation on the structural behaviour of hybrid plain weave composite laminates manufactured using Resin Infusion under Flexible Tooling (RIFT) process under static and dynamic impact loading conditions. Composite laminates were manufactured using a newly developed RIFT manufacturing facility marking the beginning of a new
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 200511
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8. Hygrothermal effects on dynamic mechanical snalysis and fracture behavior of polymeric composites
Polymer composites used above their glass transition temperatures Tg present a substantial degradation of physical properties; therefore a material's glass transition temperature and its change with moisture absorption are of practical importance. Little attention has been paid to the role of the adhesive bonding between the reinforcing fiber and matrix, par
Materials Research. Publicado em: 2005-09
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9. Aplicação de ensaio de impacto Charpy instrumentado no estudo da tenacidade à fratura dinâmica nas soldas a arco submerso em aços para caldeiras / Instrumented Charpy impact test application in the dynamic fracture toughness study by submerged arc welds at steel for boilers
A utilização do eletrodo tubular no processo de soldagem a arco submerso leva a um aumento na produtividade com um custo relativamente baixo, pois não requer investimentos complementares em equipamentos. A mudança do eletrodo sólido para o tubular acarreta variações microestruturais no metal de solda que influenciam as propriedades mecânicas, tais co
Publicado em: 2004
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10. Microstructural and Fractographic Characterization of a Thermally Embrittled Nuclear Grade Steel: Part I - Annealing
A nuclear reactor pressure vessel steel was submitted to different annealing heat treatments aimed at simulating neutron irradiation damage. The obtained microstructures were mechanically tested with subsequent metallographic and fractographic characterization. The relevant microstructural and fractographic aspects were employed in the interpretation of the
Materials Research. Publicado em: 2002-09
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11. Instrumentação de um pendulo para ensaio de impacto Charpy
The conventional Impact Charpy Test allows for the determination of the total absorbed energy ( E IND. T ) for fracture of notched specimens. However, such energy is the result obtained by adding two important values : the absorbed energy due to the initiation of fracture ( E IND.I ), and the absorbed energy due to the propagation of this fracture. The aim o
Publicado em: 1994