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Showing 1 to 20 of 22 for “"Vacuum-Assisted Resin Transfer Molding"”.
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Vacuum Assisted Resin Transfer Molding (VARTM): Model Development and Verification
In this investigation, a comprehensive 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 …
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Effect of vacuum level on the vacuum-assisted resin transfer molding process
Liquid composite molding (LCM) processes have become increasingly popular during the past five decades for the production of complex composite parts. Resin transfer molding (RTM) and structural reaction injection molding (SRIM) are the most widely used LCM processes. These two processes have the …
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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 …
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Characterization of the Vacuum Assisted Resin Transfer Molding Process for Fabrication of Aerospace Composites
… tailored composite airframe structure. 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 …
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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 …
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Effects of Shallow Bi-Angle, Thin-Ply Laminates on the Structural Performance of Composite Wings
… wing structures using an out-of-autoclave vacuum assisted resin transfer molding process. By conducting static bending tests, we show superior structural performances of the wing structure that employs shallow bi-angle fibers and thin-ply fabric, compared to those that use conventional …
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Characterization and modeling of the effect of environmental degradation on flexural strength of carbon/epoxy composites
… were manufactured for flexure tests 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 …
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Advanced composites using non-autoclave processes: manufacturing and characterization
… for aerospace applications. In 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. …
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Morphology to Thermal-Mechanical Property Relationships of Dispersed Carbon Nanoparticle Epoxy Composites
… were fabricated using basalt or E-glass 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 …
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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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Thermo-Mechanical Behavior of Polymer Composites Exposed to Fire
… In addition, an experimental technique utilizing 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 …
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Development Of A High Strength Laminate Repair System
… test methods were explored to analyze various resins in an attempt to increase the interface toughness between the parent laminate and repair laminate. A total of six resins from four suppliers were tested. Differential scanning calorimetry and dynamic mechanical rheological testing were …
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Development and Analysis of a Multifunctional Fuel Cell Structure
… designs and new processing techniques, including 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 …
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Novel Novolac-Phthalonitrile and Siloxane-Phthalonitrile Resins cured with low melting Novolac Oligomers for Flame Retardant Structural Thermosets
… low molecular weight phenol-formaldehyde novolac resins were blended with these novel phthalonitrile derivatives to achieve low viscosity resin blends. Moderate temperatures and rapid curing cycles were employed (200 ºC, 1 h and 225 ºC, 4h) to produce networks with high glass transition …
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The Chemistry of Dimethacrylate-Styrene Networks and Development of Flame Retardant, Halogen-Free Fiber Reinforced Vinyl Ester Composites
One of the major classes of polymer matrix resins under consideration for structural composite applications in the infrastructure and construction industries is vinyl ester resin. Vinyl ester resin is comprised of low molecular weight poly(hydroxyether) oligomers with methacrylate endgroups diluted …
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Fibrous tectonics
… considering issues of scalability, traditional molding techniques demand significantly more labor, material, and with that, overarching costs. Inflatable molds however, require only more air. Coupled with the rethinking of molding techniques is a consideration in the technological methodologies …
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Debond Buckling of Woven E-glass/Balsa Sandwich Composites Exposed to One-sided Heating
… end-grain balsa wood core manufactured using 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 …
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Rapid fabrication of polymers and composites via frontal polymerization
… the phosphite inhibition strategy to perform vacuum-assisted resin transfer molding and subsequent FROMP of a PDCPD-CF laminate. The resulting composite was high quality and exhibited promising mechanical properties. We anticipate the versatility and ease of use of this chemistry will greatly …
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Low Cost Manufacturing and Performance Evaluation of Soy-based Polyurethane/E-glass Composites
… low manufacturing cost. The popular thermoset resins in such applications are unsaturated polyester and vinyl ester, which contain styrene. Recently, the Environmental Protection Agency has applied stringent regulations on releasing of styrene (considered a volatile organic compound-VOC) for …
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Development of aromatic polyesters for high performance applications and use of interchain transesterification reactions as a solid-state fabrication tool
… with stable and high mechanical property films transferred to the tribopair counterface (as seen via energy-dispersive X-ray spectroscopy) lends evidence that during tribological experiments that produce contact temperatures of up to 320°C that interchain transesterifications (ITR - a class of …
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