Time Dependent Deformation
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Numerical Studies of Penetration in Light Armor, Concrete and Brick-Wall Targets
ABSTRACT The accurate numerical simulation of projectile penetration process is a complex challenge. Experimental investigation of these time-dependent non-linear events is expensive and time-consuming. In this paper, 3-D numerical simulations are carried out to estimate the penetration performance of designed penetrators against the double and triple brick-
Matéria (Rio J.). Publicado em: 18/10/2018
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2. Métodos temporales para determinar deformaciones límite en chapas metálicas
ABSTRACT The forming limit diagram (FLD) –broadly used to characterize sheet-metal formability– is made by means of strain measurement over the surface of stretched samples and the subsequent determination of limit-strain values associated with the onset of necking. Currently, researchers can make strain measurements with digital image-correlation analys
Matéria (Rio J.). Publicado em: 19/07/2018
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3. Analysis of creep and shrinkage and its utilization in health monitoring of reinforced concrete column. / Análise da deformabilidade por fluência e retração e sua utilização na monitoração de pilares de concreto.
This thesis presents the study of the time dependent deformation of concrete structures due to creep and shrinkage. Creep, shrinkage, compressive strength, splitting tensile strength and modulus of elasticity tests were performed in mixtures commonly used in construction. Experimental parameters were obtained from these mechanical characterizations and creep
Publicado em: 2010
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4. Caracterização viscoelástica por meio de ensaios de fluência e ruptura por fluência de compósitos poliméricos de matriz de resina epoxídica e fibra de carbono / VISCOELASTIC CHARACTERIZATION OF CARBON FIBER-EPOXY COMPOSITES BY CREEP AND CREEP RUPTURE TESTS
One of the main requirements for the use of fiber-reinforced polymer matrix composites in structural applications is the evaluation of their behavior during service life. The warranties of the integrity of these structural components demand a study of the time dependent behavior of these materials due to viscoelastic response of the polymeric matrix and of t
Publicado em: 2009
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5. Dinâmica da impregnação a vácuo em meios porosos
Vacuum impregnation technology (VI) is a process that consists of removing internal air of a porous medium, through the application of vacuum in a hermetic container with the sample immersed in an impregnating solution, followed the recovery of the atmospheric pressure, leading to the solution penetratation into the sample porous space. In food processing, V
Publicado em: 2009
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6. Surface topography assessment techniques based on an in-process monitoring approach of tool wear and cutting force signature
One of the most influential sources in machining affecting surface roughness is the instantaneous state of tool edge. The main objective of the current work is to relate the in-process immeasurable cutting edge deformation and surface roughness to a more reliable easy-to-measure force signals using a robust non-linear time-dependent modeling regression techn
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-09
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7. Correlation between luminescence polarization and molecular orientation in conjugated polymers / Correlação entre polarização da luminescência e orientação molecular em polímeros conjugados
The main goal of this work is the understanding of intermediated energy relaxation processes that are governed by Energy Transfer. Such processes strongly affect the optical properties of conjugated polymers, reducing the emission efficiency and the life time of OLEDs. We study specifically the polymer poly(p-phenylene vinylene), PPV, synthesized through the
Publicado em: 2006
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8. Estudo experimental da deformação ao longo do tempo de lajes contínuas e simplesmente apoiadas executadas com vigotas pré-moldadas de concreto.
This research deals with the experimental investigation of time dependent deformations in partially precast floors with composite beam-and-block floor systems made with reinforced concrete lattice joist through the measurement of deflections of prototypes with real dimensions. It is a continuation of several researches of composite beam-and-block floor syste
Publicado em: 2005
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9. Time-dependent behavior of sulphatic rocks of the anhydrite and gypsum / Comportamento dependente do tempo de rochas sulfáticas de anidrita e gipso
The purpose of this thesis is to contribute for the knowledge of time-dependent behavior of sulfatic rocks of anhydrite and gypsum. Emphasis is given to provide straightforward arguments about physical mechanisms responsible for creep observed in some underground excavations in those rocks in Europe. Explanation for this phenomena is not clear yet and studie
Publicado em: 2005
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10. Proteins with mechanical functionality: a physico-chemical study on the viscoelasticity of gliadin, a storage protein from wheat gluten / Proteínas com funcionalidade mecânica: um estudo físico-químico sobre a viscoelasticidade da gliadina, uma proteína de reserva do glúten do trigo
The thesis consisted in a rheological study of the dynamics of gels and dispersions of gliadin from wheat gluten in pure dimethylsulfoxide, dimethylformamide or formamide and in their mixtures with water. The effect of temperature and that of the concentration of the component species (protein and solvent constituents) on flow behavior and deformation were e
Publicado em: 2004
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11. IN VITRO ACTION OF COBRA VENOM ON GOAT SPERMATOZOA ULTRASTRUCTURE BY TRANSMISSION AND SCANNING ELECTRON MICROSCOPY
Goat spermatozoa were incubated in vitro in Tris-citrate buffer, pH 7.2, containing 0, 40, 80, or 160 mug of Naja haje venom/mL buffer for 4 hours. During incubation, the percentages of sperm motility were decreased, while percentages of dead spermatozoa were increased in a time and concentration-dependent manner. The effect of venom concentrations on the ul
Journal of Venomous Animals and Toxins. Publicado em: 2002
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12. Evaluation of powder and tableting properties of chitosan
The aim of this study was to analyze the process of tablet formation and the properties of the resulting tablets for 3 N-deacetylated chitosans, with a degree of deacetylation of 80%, 85%, or 90%. Material properties, such as water content, particle size and morphology, glass transition temperature, and molecular weight were studied. The process of tablet fo
Springer-Verlag.