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 44 for “"Composite manufacturing"”.
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Kinematics of Inter-Ply Interfaces In Composite Manufacturing
<p>The ubiquitous usage of polymer matrix composites in many applications demands a comprehensive understanding of composite interfaces and processing induced residual stresses, which critically affect both the manufacturing processes and the deformation mechanisms. Processing induced residual …
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Aerospace composite manufacturing cost models as geometric programs
The introduction of large, composite transport aircraft, such as the Airbus A350 and the Boeing 787, has been fraught with billions of dollars of production cost overruns. This research develops a novel approach to manufacturing cost modeling during the conceptual design phase using Geometric …
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Optimization of thermoplastic composite manufacturing with digital process intelligence
Thermoplastic composites are gaining traction in industries such as aerospace and automotive due to their mechanical toughness, recyclability, and scalable manufacturing. However, the relative nascency of thermoplastic composites and their complex production means optimal manufacturing parameters …
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An investigation into a magnetic compaction technique for composite manufacturing
Submitted in fulfilment of the requirements for the degree of Master of Engineering: Mechanical Engineering, Durban University of Technology, Durban, South Africa, 2022.
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A methodology for the automation of dry fabric layup for fiber reinforced polymer composite manufacturing
… (NCF) plies for 2-dimensional and 3-dimensional composite components. This research includes the development of a machine capable of imparting shear on NCF plies. Results are presented with an equation for calculating machine settings for a given contour.</p> <p>The machine is found to be capable …
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Data Intensive Method For Processing Defect Detection and Mitigation For Composites
<p>Composite manufacturing without processing defects is a crucial step in satisfying the production, performance, and quality requirements of composite materials in various industries. Autoclave processing enables manufacturing of high-quality composite parts with excellent mechanical properties, …
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Economics of composite material manufacturing equipment
Composite materials are used for products needing high strength-to-weight ratios and good corrosion resistance. For these materials, various composite manufacturing processes have been developed such as Automated Tow Placement, Braiding, Diaphragm Forming, Resin Transfer Molding, Pultrusion, …
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In-situ deformation monitoring of aerospace qualified composites with embedded improved draw tower fibre Bragg gratings
… fibres is enhanced and the distortion in the composite is reduced. The author elaborates in detail the methods of strain and temperature calibrations and the different setups which are applied. Additionally, with respect to the high temperatures during the composite manufacturing process, the …
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Miniature Fiber Optic Viscoelasticity Sensor for Composite Cure Monitoring
… most promising strategy for reducing the cost of manufacturing polymer matrix composites while improving their reliability is the use of sensors during processing to permit control of the cure cycle based on measurements of the material's internal state. While sensors have been demonstrated that …
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In-Situ Measurement of Resin Shrinkage for Aerospace Components
… role in the residual stress evolution during composite manufacturing. In this thesis, we develop a new in-situ experimental approach for measuring resin shrinkage during curing with the help of digital image correlation (DIC) instrumented on a specially designed autoclave with borosilicate …
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Cost modeling and design for manufacturing guidelines for advanced composite fabrication
… almost none (excluding proprietary) for advanced composite materials. Therefore, the central objective of this thesis is to provide a comprehensive overview of the costs of common composite production technologies such as Hand Layup, Resin Transfer Molding, Automated Tow Placement, Pultrusion, …
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Feasible Workspace for Robotic Fiber Placement
… fiber placement is emerging as an automated manufacturing process for the fabrication of large composite material complex structures. While traditional composite manufacturing techniques limited the products' size, geometrical shapes and laminate patterns, robotic automation of the fiber …
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A Comparison of Crushing Parameters of Graphite Composite Thin-Walled Cylinders Cured in Low and High Pressures
<p>Out-of-Autoclave (OoA) processes for manufacturing aerospace-grade parts needs to be better understood to further the development and success of industries that are manufacturing reusable launch vehicles, military and commercial aircraft, and spacecraft. Overcoming the performance limitations …
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Development and application of transition detection using infrared thermography for characterization of fan blade waviness effects
… waviness on fan blades arises from the carbon composite manufacturing process. The waviness results in transition point movement due to receptivity amplification between the surface wavelength and Tollmien-Schlichting wavelength, as recently described by Lee [17]. The research, therefore, …
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Investigation of integrally-heated tooling and thermal modeling methodologies for the rapid cure of aerospace composites
Carbon Fiber Reinforced Polymer (CFRP) composite manufacturing requires the CFRP part on the associated tool to be heated, cured, and cooled via a prescribed thermal profile. Current methods use large fixed structures such as ovens and autoclaves to perform this process step; however heating these …
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Characterization and mitigation of blade waviness effects on fan performance
The role of surface waviness, arising from carbon composite manufacturing process, on aeroengine fan blade performance is characterized. The mechanisms for laminar-turbulent transition are assessed numerically and experimentally over relevant range of aerodynamic and geometric parameters. The …
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Cure characterization and process modeling of soy-based composites
… resin system, fabrication of pultruded soy-based composites, and analysis of flexible polymeric foams. In the first part of this work, the cure kinetics and rheology of the soy-based resin system were studied. The cure kinetics models of the different resin formulations were developed. A neural …
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Manufacturing of advanced continuous fiber reinforced composites for high temperature applications
"New resin systems have enabled composites to be considered as attractive alternatives in structural applications that require material to be stronger, lighter and/or more resilient to environmental effects. The current work is on the development of processes to produce continuous fiber reinforced …
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Evaluation of Phenol Formaldehyde Resin Cure Rate
Cure time is often the bottleneck of composite manufacturing processes, therefore it is important to understand the cure of today's thermosetting adhesives. This research attempts to characterize the cure rate of two commercial phenol-formaldehyde adhesives. Two methods are used, parallel-plate …
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Synthetic vascular materials via a vaporization of sacrificial component (VaSC) approach
… introduction of microchannels into traditional composites has numerous applications ranging from self-healing to autonomous cooling materials. However, current approaches for microvascularization are hindered by scalability and lack of compatibility with the composite manufacturing proceess. …
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