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Showing 1 to 19 of 19 for “"prepregs"”.
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Drape properties of thermostetting prepregs
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Compaction and Cure of Resin Film Infusion Prepregs
… to describe the cure and consolidation of prepregs used for resin film infusion. Resin kinetics, rheology, flow and fiber deformation are considered. Resin kinetics are simulated with an isothermal autocatalytic-1 type relation. The non-Newtonian viscosity of the Cytec™ 754 resin is …
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Thermoplastic composite consolidation
… of high-quality composites from thennoplastic prepregs requires careful selection of the processing cycles so that intimate contact at the ply interfaces is achieved resulting in the formation of strong interply bonds and the process-induced residual stress is minimized to ensure superior …
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Characterization of Cure Kinetics and Physical Properties of a High Performance, Glass Fiber-Reinforced Epoxy Prepreg and a Novel Fluorine-Modified, Amine-Cured Commercial Epoxy.
… of processing parameters in the processing of prepregs. Shrinkage due to both resin consolidation and fiber rearrangement is measured as the linear expansion of the piston on a quartz dilatometry cell using TMA. The shrinkage of prepregs was determined to depend on the curing temperature, …
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The fabrication of carbon-fiber composites by aqueous suspension prepregging with larc-tpi and peek
… of impregnation was used to make thermoplastic prepregs with aqueous suspension of polymer powder and AS-4 carbon fibers. The prepregging, consolidation, and laminate evaluation procedures are described in this report. The need and importance of a dispersing and binding agent and its …
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A model for the diaphragm forming process
… continuous fiber reinforced thermoplastic prepregs in an arbitrary sequence to form a laminate. Polymeric diaphragms are placed on top and bottom of the prepreg layers to hold the material. The diaphragms are larger than the prepreg so that the composite can move freely between the …
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Compressive strength prediction for composite unmanned aerial vehicles
… characterization study of two carbon/epoxy prepregs presented to Aurora Flight Sciences are also shown here. An extension of the method presented by Barbero is also proposed for laminates with average global misalignment alphaG, in [+alphaG]n or [-alpha G]n stacking sequence.
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Nanomaterial-enabled manufacturing for next-generation multifunctional advanced composite prepreg laminate architectures
… out-of-autoclave (OoA) specially-formulated prepregs that only require heat and vacuum (i.e., pressure is not required). OoA prepreg processing also has drawbacks due to their specialized morphological and chemical formulation for vacuum-only conditions, as well as part quality (especially, …
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Cure Kinetics and Processing Parameters of Neat and Reinforced High Performance Epoxy Resins: Evaluation of Techniques
… of processing parameters in the processing of prepregs.
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Fracture and Friction Characterization of Polymer Interfaces
… on dry textile fabrics and graphite/epoxy prepregs over a range of temperatures, pressures, and sliding velocities. The results provide some general insights into the frictional response of composite prepregs as a function of the manufacturing environment. The materials tested are shown to …
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Interfacial strength development in thermoplastic resins and fiber-reinforced thermoplastic composites
… resins and fiber-reinforced thermoplastic prepregs. All tests were performed using polysulfone P1700 thermoplastic resin and AS4/P1700 graphite-polysulfone prepreg. Two test methods were examined to measure autohesion in neat resin samples. These included an interfacial tension test based …
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Nanomaterial-Enabled Out-of-Autoclave and Out-of-Oven Manufacturing of Fiber Reinforced Polymer Composites
… thesis, curing of autoclave-grade thermosetting prepregs using vacuum-bag only (VBO) processes are investigated and further developed through the employment of nanomaterials, both within the laminate itself and externally as a conductive heating mechanism. A preliminary void reduction study was …
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Production of phenol-formaldehyde resin composites
… to more resin (up to 6.5%) being retained by the prepregs and therefore more effective use of an expensive raw material. The impregnation work has indicated that residence times above 6 seconds in the varnish bath enhance the insulation resistance of the final product, possibly due to improved …
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Damage and failure mechanisms under fatigue in long fibre composites with ultra-thin plies
… mecánicas y térmicas de los distintos prepregs usados además del análisis del efecto de distintas condiciones de fabricación y ensayo en la vida a fatiga de laminados unidireccionales de 90° fabricados con material de espesor convencional y ultradelgado; y, en segundo lugar, en una …
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Processing of toughened cyanate ester matrix composites
… technique. The resin mass fraction of the prepregs was between 31 and 35%. The carbon fiber, toughened cyanate ester prepreg was fabricated into composite panels for mechanical and physical testing. The cure cycle used to manufacture the composite laminates was developed with the aid of a …
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Self-healing laminated composites from prepreg fabrics
… were fabricated from the microcapsule-containing prepregs and the healing of fatigue-induced damage was demonstrated. In addition, UD prepreg fabric containing sacrificial fibers were developed to create 3D microvascular networks within a FRP composite. This study will drive the adoption of …
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Μορφοποίηση και χαρακτηρισμός νανοσύνθετων υλικών πολυμερικής μήτρας
… με ρητίνη υμένια νανοσωλήνων άνθρακα (prepregs), με την εμβάπτιση των υμενίων σε εποξειδική ρητίνη και την κατάψυξή τους, ενώ κατά το τέταρτο στάδιο πραγματοποιήθηκε η παραγωγή των νανοσυνθέτων από τα προεμποτισμένα υμένια με χρήση αυτόκλειστου φούρνου. Στη συνέχεια τα υμένια και τα …
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Topographic characterization of polymer materials at different length scales and the mechanistic understanding of wetting phenomena
… metallic mold topography, metallic mold form, prepregs placement procedure, glass fibres content and orientation) on resulting macro-, meso- and micro-topography was studied. A model to conceptualize the influence of the most important moulding conditions on topographic characteristics and, as …
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Development of self-healing techniques for fiber reinforced composites
… revealed that samples containing supramolecular prepregs or MWCNT doped nylon electrospun veils as interleaves between the primary layers of the composite exhibited higher resistance to delamination and increased CAI characteristics after the application of the healing cycle. Finally, AE …