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 17 of 17 for “"VARTM"”.
-
Vacuum Assisted Resin Transfer Molding (VARTM): Model Development and Verification
… Vacuum Assisted Resin Transfer Molding (VARTM) process simulation model was developed and verified. The model incorporates resin flow through the preform, compaction and relaxation of the preform, and viscosity and cure kinetics of the resin. The computer model can be used to analyze the …
-
Vacuum-Assisted Resin Transfer Molding (VARTM) Model Development, Verification, and Process Analysis
Vacuum-Assisted Resin Transfer Molding (VARTM) processes are becoming promising technologies in the manufacturing of primary composite structures in the aircraft industry as well as infrastructure. A great deal of work still needs to be done on efforts to reduce the costly trial-and-error methods …
-
Advanced composites using non-autoclave processes: manufacturing and characterization
… Paper 1, vacuum assisted resin transfer molding (VARTM) process was developed for elevated temperature composites. Use of VARTM process for fabricating high temperature resins presents unique challenges such as high porosity and low fiber volume contents. Two different vacuum bagging methods: …
-
Characterization of the Vacuum Assisted Resin Transfer Molding Process for Fabrication of Aerospace Composites
… The Vacuum Assisted Resin Transfer Molding (VARTM) processing technique offers a safer, more affordable alternative to manufacture large scale composite fuselages and wing structures. Vacuum assisted resin transfer molding is an infusion process originally developed for manufacturing of …
-
Vacuum Assisted Resin Transfer Molding of Foam Sandwich Composite Materials: Process Development and Model Verification
Vacuum assisted resin transfer molding (VARTM) is a low cost resin infusion process being developed for the manufacture of composite structures. VARTM is being evaluated for the manufacture of primary aircraft structures, including foam sandwich composite materials. One of the benefits of VARTM is …
-
Low Cost Manufacturing and Performance Evaluation of Soy-based Polyurethane/E-glass Composites
… low-cost Vacuum Assisted Resin Transfer Molding (VARTM) process. VARTM has been established as a low-cost closed molding process having capability to produce large and complex parts. The literature indicates that mechanical properties of PU composites are comparable to vinyl ester composites and …
-
Fibrous tectonics
… and Vacuum Assisted Resin Transfer Molding (VARTM). These processes greatly simplify the manufacturing of composites and eliminate much of the manual labor traditionally associated with composite structures. By taking advantage of the existing vacuum bag used for compaction while producing …
-
Characterization and modeling of the effect of environmental degradation on flexural strength of carbon/epoxy composites
… using Vacuum Assisted Resin Transfer Molding (VARTM). A unique strain fixture was designed to apply constant strain on the specimens during ageing and applied a simple methodology to eliminate excessive creep in the specimens. A two-dimensional cohesive layer constitutive model with a cubic …
-
Morphology to Thermal-Mechanical Property Relationships of Dispersed Carbon Nanoparticle Epoxy Composites
… through Vacuum Assisted Resin Transfer Molding (VARTM). Mechanical characterization included quasi-static tension and flexure, high-rate compression via Split Hopkinson Pressure Bar (SHPB), and viscoelastic property evaluation using dynamic mechanical analysis (DMA). Thermal performance was …
-
Thermo-Mechanical Behavior of Polymer Composites Exposed to Fire
… Vacuum Assisted Resin Transfer Molding (VARTM) is developed to manufacture PMCs with a hypodermic needle inserted for internal pressure measurement. One-sided heating tests are conducted on the glass/vinyl ester composites to measure the pressure at different locations through thickness …
-
Development Of A High Strength Laminate Repair System
… used for vacuum assisted resin transfer molding (VARTM). Four initiators were tested and compared to the current initiator. Methods included differential scanning calorimetry and rheology. The goal with testing these initiators was to see if changing the initiator would increase the working time …
-
Development and Analysis of a Multifunctional Fuel Cell Structure
… vacuum assisted resin transfer molding (VARTM) and pultrusion. A metric which allows for the characterization of multifunctional fuel cell systems is developed and applied to three fuel cell designs. This metric uses Frostig's Higher Order Theory to analyze the mechanical behavior of the …
-
Novel Novolac-Phthalonitrile and Siloxane-Phthalonitrile Resins cured with low melting Novolac Oligomers for Flame Retardant Structural Thermosets
… via vacuum assisted resin transfer molding (VARTM) at low temperatures and heated at elevated temperatures to produce flame resistant three-dimensional networks.
-
The Chemistry of Dimethacrylate-Styrene Networks and Development of Flame Retardant, Halogen-Free Fiber Reinforced Vinyl Ester Composites
… via Vacuum Assisted Resin Transfer Molding (VARTM) is possible. The first binder system investigated was a polycaprolactone layered silicate nanocomposite, which was prepared via intercalative polymerization. Transmission Electron Microscopy (TEM) and X-ray Diffraction (XRD) data indicated a …
-
Debond Buckling of Woven E-glass/Balsa Sandwich Composites Exposed to One-sided Heating
… the Vacuum Assisted Resin Transfer Molding (VARTM) technique were the only materials analyzed. These were selected due to their current use in naval vessels and the heightened interest in the fire response properties of balsa wood and its utility as a core material. In order to better …
-
Investigation of induced thermo-mechanical response and cure kinetics during processing of carbon fiber reinforced plastics.
The manufacture of laminated composite materials using a thermosetting resin matrix is a complex process that can be understood with a knowledge of cure kinetics, heat transfer, and structural mechanics. During laminate manufacture, reinforcing fibers are impregnated with resin and subjected to …
-
Development of multifunctional polymer composites with self-healing capability
… Through vacuum assisted resin transfer molding (VARTM) process it was possible to produce, two reference laminates containing only carbon fibers and glass fibers, and laminates containing polyamide 11 (PA11), thermoplastic polyurethane (TPU) and PA11 with carbon nanotubes (PA11CNT). All the …