Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 141 for “"Vickers"”.
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Comparison Of Vickers Hardness Between Dental Ceramics And Hybrid Materials
The study aims to compare Vickers hardness of five definitive crown materials in a controlled laboratory setting. Materials & Methods: Five specimens (15 x 12 x 1.5 mm) were obtained from each tested material: zirconia (Lava Ultimate), lithium disilicate (IPS e.max CAD), lithium silicate reinforced …
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Relationships between MIBANT bend angles and selected material properties of pallet fasteners
… (p > 0.209 and R² = 0.896) for staples. The Vickers hardness number and carbon content of pallet nails are related to material properties. Vickers hardness number was found to be linearly related to static yield strength(? > 0.0001 and R² = 0.835). Vickers hardness number was also related to …
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Indentation testing of composite materials: a novel approach to measuring interfacial characteristics and engineering properties
… the deficiencies of present techniques. Vickers Microhardness Testing and Continuous Ball Indentation Testing (CBIT) of composite materials provided data for assessing the sensitivity of indentation techniques to interfacial characteristics and engineering properties. Both methods proved …
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Post-fire Mechanical Properties of Aluminum Alloys and Aluminum Welds
… empirical relationships were found between Vickers hardness and post-fire strength. Testing was also performed on butt welded samples of 6082-T6 exposed isothermally to temperatures ranging from ambient to 500oC. Vickers hardness profiles were measured across a sample to quantify the …
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Studies on Sintering Silicon Carbide-Nanostructured Ferritic Alloy Composites for Nuclear Applications
… microscopy (SEM), as well as density and Vickers hardness tests. Pure NFA, pure SiC, and their composites NFA-SiC with different compositions (2.5 vol% NFA-97.5 vol% SiC, 5 vol% NFA-95 vol% SiC, 97.5 vol% NFA-2.5 vol% SiC, and 95 vol% NFA-5 vol% SiC) were successfully sintered through SPS. …
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Industry and Society: A Study of the Home Front in Barrow-in-Furness during the First World War
… one of the UK’s most important armaments firms, Vickers, Barrow experienced the full force of industrial mobilisation and government intervention. In analysing the responses to these events, the thesis provides insights into their impact on a town and population dependent on industries stimulated …
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Microstructural Observations of Laser-Sintered Specimens for Prosthodontic Applications
… sintering, along with the microstructure and Vickers hardness of the alloy.Methods: Representative maxillary coping and implant framework specimens were prepared from STL files by a commercial laser sintering apparatus (Phenix Systems), using the dedicated Co-Cr alloy. Compatible dental …
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Characterization of residual stresses in birefringent materials applied to multicrystalline silicon wafers
… as indentations. Residual stress fields around Vickers indentations in silicon are found to be larger in size than predicted by contact mechanics. Placing Vickers indentations in close proximity creates a secondary stress field surrounding the entire indentation array, and a relationship is …
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Consolidation of Al-TiO₂ and Ti₃Al-Ai₂O₃ composite powders
… sintering Al-TiO₂ composite powder at 1480°C. Vickers hardness of the composites increased with increasing densification and increased Ah03 ceramic phase content. Vickers hardness of ≤17.5GPa was achieved for the fully densified Ti₃Al-TiO-Al₂O₃ composite whereas Vickers hardness of ≤15GPa was …
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Effect of Overlying Material on EndoCem Mineral Trioxide Aggregate Setting Reaction in Primary Molar Pulp
… polished, and analyzed for microhardness using a Vickers Microhardness Tester at depths of 1mm, 2mm, and 3mm. Statistical analyses, including ANOVA and Tukey post hoc tests, were performed with significance set at P < 0.05. Results: All experimental groups performed as well as or better than the …
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Investigation of the Lanthanide Sesquioxides as High Temperature Transformation Toughening Agents
… DTA, dilatometry, ambient and high temperature Vickers indentation, and notched-beam three point flexure.
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Study on preparation of high performance CaO-MgO-Al2O3-SiO2 system glass-ceramic with industrial by-products
… as primary crystalline phase, they also had a Vickers micro-hardness of 6.2 GPa and 6.3 GPa. When applied single-stage heat treatment, sample H4 obtained a bending strength of 77.89MPa and Vickers micro-hardness of 6.5 GPa, very close to H0. Meanwhile, when applied hot liquid-cold solid mixing …
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Physical and Biologic Properties of Calcium Silicate Endodontic Sealers
… and 1:32 and at 24 hours, 72 hours, and 1 week. Vickers microhardness was determined using a micro indenter. Solubility was tested after immersion in deionized distilled water for 24 hours. 3-way ANOVA and post-hoc Tukey test were used to analyze cell viability. 1-way ANOVA and post-hoc Tukey …
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The Effect of Tool Rotation Speed and Clamping on Deformation in Friction Stir Welded 6061-T6511 Aluminum Extrusions
… were measured on the welded extrusions. The Vickers hardness of the weld nugget was measured. The effect of each parameter on weld distortion was discovered and the mechanism of this link was suggested.</p> </p>
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Numerical and experimental investigation of mechanical strength of spot welded joints
… but identical indentation curves for Vickers, Knoop or spherical indenters and dual sharp indenters. This suggests that these methods can not be used to predict material plastic properties unless the range of material properties is pre-known. Dual spherical indenters showed significant …
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Nonlinear Finite Element Modeling and Analysis of Metal Hot Forming for Automotive Weight Reduction
… thickness, lubrication hole geometry, and Vickers hardness. It was found that the thickness distribution of the numerical model accurately represented the thickness distribution of the cold formed stage. The error in thickness estimation was 0.91% for the cold stage. Thickness change during …
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Simulación computacional y medición experimental de dureza de un recubrimiento de aluminio producido por cold spray
… En este trabajo se estudia la micro dureza Vickers de un recubrimiento de aluminio 1100 sobre un sustrato de aluminio 6061-T6. El objetivo del trabajo es determinar la capacidad del modelo computacional para predecir la dureza del material recubierto mediante cold spray. Por una parte, el …
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Experimental investigation of structure, composition and properties of novel metal-carbon covetic materials
… (elastic modulus and hardness) and Vickers and Rockwell methods (hardness). Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) were used to analyze the structure of these materials. Carbon content of covetic materials was examined by Energy Dispersive Spectroscopy (EDS) …
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The hardening of Type 316L stainless steel welds with thermal aging
… examined using several techniques, including Vickers hardness testing, to evaluate the evolution of hardness of the material, Charpy V-notch testing, to measure the evolution of toughness, and tensile testing. This thesis will focus on the variations in hardness with respect to aging time and …
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Effects of thermomechanical processing on microstructure and hardness profiles in AA6061 plates
… using a Reichert MeF3A optical microscope and Vickers hardness tester. No significant grain size variations were observed through the thickness of transfer plate. On the contrary, finished plates exhibited grain size gradients, with grain size progressively decreasing from the surface to the …
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