Propagation Materials
Mostrando 13-24 de 103 artigos, teses e dissertações.
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13. Fracture Properties of Geopolymer Concrete Based on Metakaolin, Fly Ash and Rice Rusk Ash
Geopolymers are exclusively mineral nature and are considered an alternative to materials based on Portland clinker, whose production accounts for about 5% of anthropogenic CO2 emissions in the world. The geopolymer cement concrete (GCC) may be prepared from natural oxide-aluminosilicates such as metakaolin (MK), or synthetic, such as fly ash (FA) together w
Mat. Res.. Publicado em: 17/11/2017
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14. Polymerization shrinkage stress of composite resins and resin cements – What do we need to know?
Abstract Polymerization shrinkage stress of resin-based materials have been related to several unwanted clinical consequences, such as enamel crack propagation, cusp deflection, marginal and internal gaps, and decreased bond strength. Despite the absence of strong evidence relating polymerization shrinkage to secondary caries or fracture of posterior teeth,
Braz. oral res.. Publicado em: 28/08/2017
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15. Trends in restorative composites research: what is in the future?
Abstract Clinical trials have identified secondary caries and bulk fracture as the main causes for composite restoration failure. As a measure to avoid frequent reinterventions for restoration replacement, composites with some sort of defense mechanism against biofilm formation and demineralization, as well as materials with lower susceptibility to crack pro
Braz. oral res.. Publicado em: 28/08/2017
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16. Stress Distribution in Graded Cellular Materials Under Dynamic Compression
Abstract Dynamic compression behaviors of density-homogeneous and density-graded irregular honeycombs are investigated using cell-based finite element models under a constant-velocity impact scenario. A method based on the cross-sectional engineering stress is developed to obtain the one-dimensional stress distribution along the loading direction in a cellul
Lat. Am. j. solids struct.. Publicado em: 2017-08
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17. Carbon Fiber Reinforced Polymer and Epoxy Adhesive Tensile Test Failure Analysis Using Scanning Electron Microscopy
Morphological characteristics analysis before and after tensile tests were studied using scanning electron microscopy (SEM) technique to follow the failure evolution on carbon fiber reinforced polymer (CFRP) and epoxy resins. Micrograph analysis of CFRP plate before tensile test shows some intrinsic manufacturing defects, which can influence the mechanical p
Mat. Res.. Publicado em: 06/07/2017
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18. Achieving effective confinement through utilization of non-Newtonian fluid mixture as stemming structure
Abstract The economics of a mining operation is directly influenced by blasting outcomes, where blasting aims to comminute the rock mass in order to attain smaller grain sizes to be loaded and hauled at a minimum cost for its first processing stage. In order to promote adequate rock breakage, the stemming structure needs to provide proper confinement for the
REM, Int. Eng. J.. Publicado em: 2017-03
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19. Seismic Pressures in Offshore Areas: Numerical Results
Abstract The purpose of this study is to obtain numerical estimations of seismic pressures in offshore areas considering the effect of seabed configurations and soil materials. To this end, the Boundary Element Method is used to irradiate waves, so that force densities can be obtained for each boundary element. From this hypothesis, Huygens´ Principle is im
Lat. Am. j. solids struct.. Publicado em: 2016-12
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20. Recovery of Tetragonal Phase from Previously Transformed Y-TZP
ZrO2(Y2O3)-based ceramics are widely used as biomaterials due to high fracture toughness, resulting from the tetragonal-monoclinic phase transformation in which the ceramic is submitted during crack propagation. In this context, studies involving the possibility of optimization of the tetragonal phase are important for the properties improvement of this cera
Mat. Res.. Publicado em: 16/06/2016
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21. Slope stability analysis at highway BR-153 using numerical models
Abstract An existing cut slope on Highway RS-471/BR-153 is studied. The slope is composed of the Serra Geral Formation's material: a highly altered volcanic breccia and above it a slightly altered and very fractured rhyolite. A numerical analysis of the slope is carried out in two dimensions. Fracturing of the rhyolite necessitates the use of a constitutive
Rem: Rev. Esc. Minas. Publicado em: 2016-06
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22. Effect of the loading of organomodified clays on the thermal and mechanical properties of a model dental resin
Experimental dental resins composed of triethyleneglycol dimethacrylate, urethane dimethacrylate, ethoxylated bisphenol-A-dimethacrylate and bisphenol A glycidyl methacrylate containing an organoclay as filler were prepared by photopolymerization. The addition of organoclay fillers results in slower polymerization rates (0.59 and 0.24 mol L-1 min-1, for the
Mat. Res.. Publicado em: 05/02/2016
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23. Primary and Reflected Compaction Waves in a Foam Rod Due to an Axial Impact by a Small Mass
AbstractThe propagation of compaction waves in a stationary foam block subjected to an impact by a small mass is studied in order to examine the mechanism of compaction within the primary and reflected stress waves. The analysis is focused on aluminium strain rate insensitive foam that exhibits strain hardening under quasistatic compression. A theoretical ap
Lat. Am. j. solids struct.. Publicado em: 2015-05
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24. Three dimensional Free Vibration and Transient Analysis of Two Directional Functionally Graded Thick Cylindrical Panels Under Impact Loading
AbstractIn this paper three dimensional free vibration and transient response of a cylindrical panel made of two directional functionally graded materials (2D-FGMs) based on three dimensional equations of elasticity and subjected to internal impact loading is considered. Material properties vary through both radial and axial directions continuously. The 3D g
Lat. Am. j. solids struct.. Publicado em: 2015-04