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Showing 1 to 20 of 46 for “"prepreg"”.
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Thermoplastic prepreg manufacture by solution impregnation
… composites are commonly manufactured from "'prepreg" materials, where the reinforcing fibers are preimpregnated with resin. The objectives of this investigation were to identify the critical parameters in impregnation of the fiber tow by a thermoplastic solution, and to produce high quality …
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Self-healing laminated composites from prepreg fabrics
… Microcapsule-containing unidirectional (UD) prepreg fabrics were developed to uniformly distribute the microcapsules at the fiber interstitial spaces. Self-healing FRP composites were fabricated from the microcapsule-containing prepregs and the healing of fatigue-induced damage was …
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Thermal rheological analysis of cure process of epoxy prepreg
The cure process of epoxy prepreg used as composite pipe joints was studied by means of differential scanning calorimetry (DSC), Bohlin Rheometer and other techniques. Isothermal DSC measurements were conducted between 110 and 220 oC, at 10 oC intervals. The results show that the complete cure …
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Nanomaterial-enabled manufacturing for next-generation multifunctional advanced composite prepreg laminate architectures
… a thermoset or thermoplastic polymer to form prepreg sheets, are in widespread use via autoclave processing due to their ease of use and high fiber volume fraction. However, autoclaves have high capital costs, and incur high operating costs due to the convective heating and applied pressure. …
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Re-use of the carbon fiber woven prepreg cut-outs: a multidisciplinary study
L'abstract è presente nell'allegato / the abstract is in the attachment
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Interlaminar reinforcement of carbon fiber composites from unidirectional prepreg utilizing aligned carbon nanotubes
… Hexcel IM7/8552 carbon fiber aerospace composite prepreg. In addition, fatigue testing was performed on a selected A-CNT height to generate a SBS fatigue life curve. Interface morphology and laminate damage were imaged via optical and scanning electron microscopy of cross-sections and crack …
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The Effect of Part Curvature on the Formation of Residual Stresses in Carbon Fiber Prepreg Laminates
… throughout the cure cycle of carbon fiber prepreg in several different lay-ups and across tool plates with varying curvatures to determine what effect the curvature has on the formation of residual stresses. Four different layup configurations are used, with two using regular-thickness …
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Capillary Effects of Nanoporous Networks on Aerospace Autoclave-grade Prepreg Composites Enabling Vacuum-bag-only Manufacturing
… to each ply-ply interface in the composite prepreg laminates to remove voids by encouraging resin infusion through capillary effects. This removes the need for applied autoclave pressure and enables vacuum-bag-only (VBO) curing of autoclave-grade composites using either conductive or …
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Investigation of Processing Conditions and Viscoelastic Properties on Frictional Sliding Behavior of Unidirectional Carbon Fiber Epoxy Prepreg
… friction of unidirectional carbon fiber epoxy prepreg at various contact pressures, temperatures and sliding velocities. Viscoelastic properties such as the complex viscosity (η*), storage modulus (G'), loss modulus (G"), and loss factor (tan δ) were used to determine the critical transition …
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A process simulation model for the manufacture of composite laminates from fiber-reinforced, polyimide matrix prepreg materials
… from fiber-reinforced polyimide (PMR-15) matrix prepreg materials. The simulation model is developed in two parts. The first part is the volatile formation model which simulates the production of volatiles and their transport through the composite microstructure during the imidization reaction. …
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Process Development for Compression Molding of Hybrid Continuous and Chopped Carbon Fiber Prepreg for Production of Functionally Graded Composite Structures
… composites lab using unidirectional carbon fiber prepreg composites. A direct comparison was drawn between autoclave and compression molding methods to validate compression molding as an alternative manufacturing method in that lab. A method of manufacturing chopped fiber from existing …
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Detecting Delamination in Carbon Fiber Composites Using Piezoresistive Nanocomposites
<p>Carbon fiber prepreg composites are utilized successfully as structural materials for different lightweight aerospace applications. Delamination is a critical failure mode in these composite materials. As composite plies separate from each other, the composite loses some of its ability for …
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Fiber tension loss during the winding and cure of a filament wound composite case
… winding and cure of a composite case wound with prepreg material, and 2) to calculate the change in tension during cure using a simulation computer program. Of particular interest was the loss of fiber tension due to resin flow (RFTL). A total of twenty-four tension loss experiments were …
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Carbon Fiber Reinforced Lithium-Ion Battery Composites with Higher Mechanical Strength: Multifunctional Power Integration for Structural Applications
… filaments. It was incorporated exactly on the prepreg surface to obtain effective inter-facial bonding and adhesion between the layers. The mechanical and physical properties of carbon fiber reinforced polymers (CFRP) with electrospun multi walled carbon nano tubes (CNTs) have evidenced to …
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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.
… glass fiber reinforced high performance epoxy prepreg composed of the tetrafunctional epoxy tetraglycidyl 4,4-diaminodiphenyl methane (TGDDM), the tetrafunctional amine curing agent 4,4'-diaminodiphenylsulfone (DDS) and an ionic initiator/accelerator, are determined by various thermal analysis …
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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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Some molecular contributions and curing considerations: Physical properties of thermoset network materials
… are investigated: (1) processing thick section prepreg epoxy materials, (2) characterization of the contributions to rubbery elastic behavior and (3) improved epoxy resins through lightly cross-linked stiff molecular backbones.
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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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The effects of polymeric binders on the processability and properties of composites made by suspension prepregging
… fiber composites via aqueous suspension prepregging. Suspension prepregging requires the use of a binder dispersant: i) to disperse the polymer particles so as to get good fiber-matrix distribution in the prepreg, and ii) to improve the handling characteristics of the prepreg, by holding …
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