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 31 for “"Directed energy"”.
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Laser Finishing of Components by Directed Energy Deposition
L'abstract è presente nell'allegato / the abstract is in the attachment
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Laser Directed Energy Deposition for Processing and Repairing Steels
L'abstract è presente nell'allegato / the abstract is in the attachment
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Directed Energy Deposition Additive Manufacturing Supplier Sourcing for Aerospace
… P&W wants to explore the potential of Directed Energy Deposition (DED), an AM technology that could be used for bigger parts and adding features to existing parts. The project objective is to bring on DED suppliers to enable the acquisition of development metal hardware for P&W’s …
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Directed energy deposition of tool steel/copper alloy multi-material structures
… investigates the potential of MMSs fabricated by directed energy deposition (DED) using tool steel and copper alloy. Specifically, AISI H13 hot work tool steel is deposited on copper-beryllium alloy (CuBe) substrate using three deposition strategies: directly depositing H13 on CuBe (H13/CuBe), …
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Feasibility Assessment of Repairing Tools and Dies via Directed Energy Deposition
L'abstract è presente nell'allegato / the abstract is in the attachment
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An Investigation of Polymer Support Structures In Metal Directed Energy Deposition
Metal directed energy deposition (DED) can create complex components and has a high deposition rate compared to other metal additive manufacturing (AM) processes. As a result, DED is of interest to die and mold, energy, and aerospace industries, among others. However, the design space of DED is …
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Thermomechanical effects of ground-based directed energy weapons on satellites and Intercontinental Ballistic Missiles
… aspects of two generic models loaded by high energy laser beam. We present an application of MSC software in modeling thermo-mechanical behavior, both steady state and transient behavior of satellite and missile structures. Thermal energies used for simulation correspond to high energy laser …
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Solidification behavior and texture of laser-wire directed energy deposition of 316L austenitic stainless steel
… texture of AM 316L produced using a laser-wire directed energy deposition (DED-LB) process was investigated and delta-ferrite morphology was utilized to determine the solidification pathway of AM 316L. Variations in shielding gas set-up and build type, single versus multi-track walls, resulted …
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Laser Directed Energy Deposition of tool steels; Investigating the heat treatment strategies and other potentialities of LDED
… (PLASWeld Ferro55), fabricated through Laser Directed Energy Deposition (LDED). The as-built microstructure of these steels comprises a martensitic matrix with ~10 vol.% retained austenite (RA) as a consequence of microsegregation at cellular\dendrite boundaries. The tempering behavior is …
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The effect of the build orientation and heat treatment on the fatigue and fracture properties of a directed energy deposited nickel-based superalloy (Inconel 718)
… by additive manufacturing technique, directed energy deposition (DED). Three different build orientations namely XY, XZ and ZX, in both the as-built and heat-treated conditions were tested through a combination of comparative fatigue crack growth rate (FCGR) and fracture toughness (FT) …
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Modeling the Transient Effects of High Energy Subsystems on High-Performance Aerospace Systems
As directed energy technology continues to evolve and become a viable weapon alternative, a need exists to investigate the impacts of these applications without a "plug-and-check" method, but rather with an analysis governed by fundamental principles. This thesis examines the transient thermal …
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Methodology to Perform Cyber Lethality Assessment
… currently exercise expertise in the kinetic and directed energy weapon domains. When the Navy develops weapons in the kinetic and directed energy domains, there are clear and well established procedures and methodologies for performing target characterization that support weapon-target pairing. …
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ADDITIVE MANUFACTURING OF SUPERHYDROPHOBIC STAINLESS STEEL COMPOSITES
… (BNNT) were mixed and printed via laser powder directed energy deposition (LP-DED). The additively manufactured surfaces were meant to mimic naturally occurring hydrophobic surfaces. Material characterization was conducted using contact angle analysis of water droplet tests, imaging of the …
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Printing on Objects: Curved Layer Fused Filament Fabrication on Scanned Surfaces with a Parallel Deposition Machine
… of technologies like direct write and directed energy deposition which can deposit layers onto uneven surfaces. Replicating these capabilities on consumer 3-axis FFF machines is difficult mainly due to issues with reliability, repeatability, and quality. This thesis proposes, …
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Anode Materials for High Power Microwave Devices
The term directed energy relates to devices capable of generating highly focused energy sources, including lasers, particle beams and microwaves. Extensive research is continuingly conducted into such devices’ frequency spectrum in order to increase their power levels to develop new applications. …
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Comparison of Heat Exchanger Designs for Aircraft Thermal Management Systems
… surveillance and reconnaissance (ISR) and directed energy weapons, requirements for survivability, the use of composite materials, etc., existing thermal management systems and their components have been pushed to the limit. To address this issue, more efficient methods of thermal …
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Ratchet dynamics in nonlinear Klein-Gordon systems
In the first part of the work we have studied a directed energy transport in homogeneous nonlinear extended systems in the presence of a biharmonic force and dissipation. We have shown that the mechanism responsible for unidirectional motion of topological excitations is the coupling of their …
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PROCESSING AND CHARACTERIZATION OF TINI-BASED ALLOYS FABRICATED BY LASER AIDED MANUFACTURING
<p>"Laser powder-based directed energy deposition (DED) is a major laser aided additive manufacturing (AM) process for metals. It applies laser energy to deposit metal powders to form 3D metal parts. Apart from manufacturing traditional alloys, DED can also be used to develop advanced alloys with …
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Real-Time Thermography for In Operando Additive Manufacturing Defect Mitigation using a Machine Learning Approach
Directed Energy Deposition (DED), a subset of additive manufacturing, produces materials such as metal–matrix composites and functionally graded coatings by utilizing a concentrated high-power laser as the primary energy source. In spite of its benefits, DED continues to be confronted by …
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Comprehensive modeling of process-molten pool condition-property correlations for wire-feed laser additive manufacturing
… of printed parts. The complexity of modeling the directed energy deposition (DED) process, high characterization and printing cost, and the destructive testing of the final build part for quality testing motivates the need for developing in situ quality assurance and control techniques. In-process …
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