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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 32 for “"Selective Laser Sintering"”.
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Indirect selective laser sintering of ceramics
… the ceramic particles together during shaping. Selective Laser Sintering (SLS) is capable of producing small complex polymer features, but how this capability translates to indirect SLS of ceramics is an open question. This dissertation aims to systematically investigate the limitations of using …
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Direct selective laser sintering of aluminium alloy powders
… by studying the effect of powder properties and laser processing parameters on the microstructures and properties of both single layer and multiple layer builds. On the basis of experimental evidence, the SLS/SLM of aluminium powders could be categorised into full melting (SLM) which was found to …
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Finite element analysis of curl development in the selective laser sintering process
Selective laser sintering (SLS) is a rapid prototyping process, which operates by using a laser to locally heat an area within a layer of powder material, causing it to fuse together, creating a thin cross-section of solid material. 3D shapes are built by repeatedly depositing a layer of fresh …
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Selective laser sintering of bioactive glass scaffolds and their biological assessment for bone repair
… additive manufacturing techniques, like the selective laser sintering (SLS) process, provides control over pore interconnectivity, pore geometry, and the overall shape of the scaffold, which aids in repairing different regions of the bone. The main objectives of this dissertation were to …
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Finite element analysis of additive manufacturing of polymers using selective laser sintering, challenges and potentials
… mechanical performance of polymers produced by a selective laser sintering (SLS) process and potential applications utilizing simulation to enable faster and less costly iterative design. Utilizing AAS, the print process to create tensile test specimens was simulated and the resultant virtual …
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Hydrostatic Pressure Testing of a Square-Cross Section Stainless Steel Propellant Tank Manufactured Using Selective Laser Sintering
… to determine if parts manufactured using metal selective laser sintering (SLS) exhibit the same isotropic material properties as conventionally made metal parts. This was accomplished by performing a hydrostatic pressure test (HPT) of a metal SLS manufactured propellant tank, constructed for a …
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A comparative study of rapid prototyping systems
… popular commercial Rapid Prototyping systems: Selective Laser Sintering (SLS), PolyJet, Fused Deposition Modeling (FDM), and 3D Printing (3DP) at the University of Missouri, Columbia. The results can be used as a preliminary guide to help users determine optimal strategies for rapid prototyping …
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Towards personal fabrications : tabletop tools for micron and sub-micron scale functional rapid prototyping
… of 100nm. Finally a micro-mirror array based selective laser sintering apparatus was built for the rapid, maskless patterning of PEMS. This tool was used to directly pattern metal structures, and for the rapid manufacture of elastomeric stamps for "nano embossing". Minimum feature sizes under …
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Silicon infiltration of silicon carbide selective laser sintered preforms
… silicon carbide preforms are created using selective laser sintering. These parts are then infiltrated with an epoxy to decrease slumping of the part. They are then infiltrated using high temperature pressureless infiltration of a silicon matrix. This materials system can be applied in a …
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A pneumatic conveying powder delivery system for continuously heterogeneous material deposition in solid freeform fabrication
… build material provides the potential for the Selective Laser Sintering (SLS), ThreeDimensional Printing (3DP), and Freeform Powder Molding (FPM) processes to be altered to create continuously heterogeneous material composition. The current roller distribution system needs to be replaced with a …
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Parametric analysis of part suitability in Additive Manufacturing
… build time for parts manufactured via the Selective Laser Sintering process, utilizing specific metrics for part geometry and machine specific parameters. Key elements of the AM cost function are identified using the estimation model, paying close attention to assessing the impact of …
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Creating Complex Hollow Metal Geometries Using Additive Manufacturing and Metal Plating
… of a hybrid manufacturing approach that combines selective laser sintering with an electroforming process to produce complex, hollow, metal geometries. The developed process uses electroless nickel plating on laser sintered parts that then undergo a flash burnout procedure to remove the polymer, …
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Economic and technological advantages of using high speed sintering as a rapid manufacturing alternative in footwear applications
… One type of rapid manufacturing technology, Selective Laser Sintering, only allows for a point-by-point sintering process to construct the 3D representations of CAD models. This makes for long processing periods and is ineffective for high volume manufacturing. However, a new process called …
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An Experimental Study of the Impinging and Freezing Dynamics of a Colloidal Droplet on Solid Surfaces
… technologies, such as stereolithography (SLA), selective laser sintering (SLS), and plastic extrusion, have been developed to produce finished components. However, each technology has its limitations, including restricted printing resolution or limited material selection. A novel idea in …
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Strengthening porous metal skeletons by metal deposition from a nanoparticle dispersion
… such as three-dimensional printing (3DP) and selective laser sintering (SLS) must be improved for them to achieve wide application in direct production of metal parts. This work seeks to reduce sintering and deformation of porous metal skeletons during liquid-metal infiltration by reinforcing …
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Surface texture enhancement of SLS processed turbine blades using a mix of flexible media and abrasives
Additive manufacturing technologies such as Selective Laser Sintering of Grade 5 Titanium has been used extensively within the aerospace industry as it allows for the fabrication of complex shapes with minimal material wastage. With the increased use of complex shapes, newer polishing technologies …
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Monte Carlo-Based Predictive Modeling of Geometric Defects in Cellular Truss Structures Manufacturing
… stochastic lattices are also fabricated using selective laser sintering to catalogue the geometric defects specific to the process and surface-based lattices and summarize the empirical findings. Overall, the proposed methodology quantifies defect-driven variability in mechanical properties, …
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Direct Metal Laser Sintering of Titanium implant with Tailored structure and Mechanical Properties
Direct Metal Laser Sintering has attracted much attention over the last decade for producing complex parts additively based on digital models. The capability and reliability of this process has stimulated new design concepts and has widened the manufacturing perspective of product customisation. …
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