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.
Results
Showing 1 to 20 of 41 for “"Vickers Hardness"”.
-
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 …
-
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 …
-
Post-fire Mechanical Properties of Aluminum Alloys and Aluminum Welds
… were evaluated through static tensile tests and hardness testing on cooled samples. Using this data, an assessment was performed to investigate the relationship between hardness and mechanical properties. For the alloys evaluated, empirical relationships were found between Vickers hardness and …
-
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. …
-
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 …
-
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 …
-
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>
-
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 …
-
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 …
-
Effects of thermomechanical processing on microstructure and hardness profiles in AA6061 plates
… (?) and temperature (T) - on grain structure and hardness evolution in AA6061 plates were investigated by simulating the rolling process using plane strain compression (PSG). Particular emphasis was exerted on understanding the impact of the variables on the overall mean grain size and hardness, …
-
Avaliação do efeito da imersão em diferentes soluções de limpeza na dureza, rugosidade e estabilidade de cor de dentes artificiais de resina acrílica
… peroxide) and a control (distilled water) on the Vickers hardness, surface roughness (Ra) and color stability of artificial acrylic resin teeth (Platinum TRI Bionew and 3G). To assess hardness and roughness, 80 maxillary central incisors was selected, which were included in PVC tubes and had …
-
Silicon infiltration of silicon carbide selective laser sintered preforms
… density measurements, four point bend testing, hardness testing, and scanning electron microscopy were all performed to characterize the parts. The silicon carbide/silicon parts had little shrinkage, were fully infiltrated, have good flexural strength. Flexural strength for non-epoxy silicon …
-
Microstructural and mechanical characterization of silicon carbide irradiated with 158 MeV xenon swift heavy ions.
… structural changes at the atomic level, while Vickers’ hardness testing will evaluate changes in the material's hardness. Additionally, Atomic Force Microscopy (AFM) will be used to study surface structural modifications and to extract mechanical properties such as Young's modulus and …
-
Structure-property relations of nanostructured carbon systems as a function of processing
… X-Ray Diffraction (XRD), Raman spectroscopy and Vickers Hardness results indicate that increasing the temperature ramping rate (in the range of 10°C/min - 40°C/min) increases the prevalence of defects in the nanocomposite system as well as increasing the standard error of both crystallite sizes …
-
Characterization of thermally diffused bordie layers on AISI 1018 steel : residual stresses (by synchrotron radiation) and microhardness
… formed by the diffusion process have high hardness and strong ware and corrosion resistance. In order for coatings of this nature to be industrially successful, their service life should be long and characterization should be extensive. Measuring the residual stresses of the coatings caters …
-
A study investigating the mechanical testing of a novel dental restorative material and its biocompatibility
… materials were tested using bi-axial flexure, vickers hardness, water sorption and water solubility tests, but a one-way ANOVA showed no significant difference between their mechanical properties. Cytotoxicity tests were also performed by culturing RBC specimen discs both directly and …
-
The fracture toughness of ultrafine WC-Co Alloys
… The Palmqvist testing was carried out on a Vickers hardness machine using indenting loads of 20, 30 and 50kg. The Palmqvist crack lengths were measured by summing the individual crack lengths emanating from the corners of the hardness indentation. These crack lengths were used in a formula …
-
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 …
-
Effect of Overlying Material on EndoCem Mineral Trioxide Aggregate Setting Reaction in Primary Molar Pulp
… of common restorative materials on the microhardness of ENDOCEM-MTA in primary molar pulpotomies. The study assessed whether the material placed over ENDOCEM-MTA affects its setting reaction, surface hardness, and uniformity across depths. Methods: Fifty extracted primary molars were prepared …
-
An investigation of the mechanical and physical properties of copper-silver alloys and the use of these alloys in Pre-Columbian America
… hammering. The rate of work hardening and the Vickers Hardness Number, as functions of the percent reduction in thickness, are similar for alloy compositions containing between 30 wt% and 80 wt% Cu. This suggests that ancient metalsmiths likely annealed the copper-silver alloy artifacts …
Page 1 of 3