摘要:
The present disclosure relates to composite articles comprising non-linear elongated nanostructures and associated systems and methods. In certain embodiments, collections of carbon nanotubes or other elongated nanostructures can be used to provide mechanical reinforcement along multiple directions within a composite article.
摘要:
A method for preparing a composite material layer (400, 500, 600), said composite material layer (400, 500, 600, 700, 800) comprising discrete fibre domains (402, 502, 602, 702) comprising discontinuous fibres, wherein a said discontinuous fibre does not extend beyond a said fibre domain, the method comprising: providing a continuous pre-preg layer comprising reinforcing fibres dispersed in a matrix, wherein said reinforcing fibres are generally aligned in a fibre alignment direction; making a plurality of first disconnected cuts through an entire thickness of said pre-preg layer, wherein said first disconnected cuts are separated in said fibre alignment direction, and wherein said first disconnected cuts have a component perpendicular to said fibre alignment direction; and making one or more of second disconnected cuts through an entire thickness of said pre-preg layer, wherein a said second disconnected cut is made along a line which is generally parallel to said fibre alignment direction, and wherein a said line connects corresponding, respective end points of said first disconnected cuts.
摘要:
A fibre reinforced composite product can be made by first forming a scaffold structure (400) with a set of tubes (408) running within the product interior, using a digital printing process. Using a carrier fluid, the tube lumens are invested with fibres and then matrix material. The carrier fluid may enter through the end of a tube connecting with an input manifold (920) and exit the tube radially via a capillary (904, 908) which runs alongside the tube.
摘要:
L'invention concerne un procédé pour fabriquer une pièce en matériau composite résistant à l'effort, dans lequel le matériau composite est contraint à fluer dans un canal appartenant à un moule (1) et délimité par une paroi sélectivement chauffée (2, 3), les fibres du matériau composite adoptant par fluage une orientation statistiquement préférentielle. Selon l'invention, le matériau composite comprend une résine thermodurcissable, le fluage de ce matériau dans le canal et le chauffage de la paroi du canal sont concomitants, et la température du canal et la vitesse de fluage du matériau composite dans le canal sont déterminées l'une par rapport à l'autre pour que le matériau composite (4, 10) fluant dans le canal forme une veine fluide présentant une section moyenne qui décroît au cours du fluage de ce matériau dans ce canal en raison de la polymérisation de la résine.
摘要:
In a method of producing a moulded product, fibre such as carbon fibre is supplied to a robot delivery head where it is cut into shorter lengths and delivered to a mouldung tool in a desired orientation and in a desired number of layers to achieve a desired thickness and strength. Resin is then applied to the aligned fibres and cured to form the product. Alignment or substantial alignment of fibre is maintained by applying vacuum to the mould, by electrostatic means, or by coating the fibre with resin prior to application to the moulding tool and heating the moulding tool surface, or by coating or impregnating the fibre with a ferric powder and magnetizing the moulding tool, or by applying a mist layer of epoxy in front of the shortened lengths of fibres. Fibre lengths and deposition rates are varied as required. The method facilitates fully automated production reducing process time and component costs. The invention also comprises a corresponding moulded product.
摘要:
A method of molding a reinforced article (100) for optimizing heat transfer, electrical conductivity and/or structural integrity is provided. A mold assembly is first provided which is capable of forming an article (100) of a desired configuration, which may include a base (112) and upstanding fins (114). The desired positioning of the filler within the molded article (100) is determined according to the thermal, electrical or structural needs of the article (100). An input gate (116) and output gate vent (118) is formed in the mold assembly to insure positioning of the filler as desired. Polymer, loaded with reinforced filler, is introduced into the mold assembly via the input gate (116). Polymer is positioned in the mold assembly with the reinforcing filler being substantially parallel and aligned with the flow path. A bottom surface (120) of base (112) is provided with flush thermal communication with a heat generating device which may be positioned in the area designated (122).
摘要:
A fiber-reinforced, polymeric implant material useful for tissue engineering, and method of making same are provided. The fibers are preferably aligned predominantly parallel to each other, but may also be aligned in a single plane. The implant material comprises a polymeric matrix, preferably a biodegradable matrix, having fibers substantially uniformly distributed therein. In preferred embodiments, porous tissue scaffolds are provided which facilitate regeneration of load-bearing tissues such as articular cartilage and bone. Non-porous fiber-reinforced implant materials are also provided herein useful as permanent implants for load-bearing sites.
摘要:
The present invention is an improved prepreg layer, multilayer composite based on the improved prepreg layer, and article made from the multilayer composite. The prepreg layer of the present invention comprises an array of at least two adjacent, coplanar fibrous elements. Each element comprises a plurality of unidirectional coplanar fibers embedded in a polymeric matrix. The fibers are up to eight inches, preferably one to eight inches, and more preferably two to six inches long. The prepreg layer of the present invention is useful to make a multilayer composite comprising a plurality of the prepreg layers as recited above. The fibers of adjacent layers are at an angle of about 90° from each other. The composite preferably has 2 to 500, more preferably 10 to 150, and most preferably 60 to 120 layers.
摘要:
Prepreg-Stack (10, 10a-d) umfassend mehrere Lagen aus Fasermaterial mit Harzimprägnierung, insbesondere als ebenes Produkt ausgeführt, wobei zumindest eine Decklage (1, 1.1) als durchgängige Lage aus Fasergewebe in Köperbindung ausgeführt ist und alle weiteren Lagen (2, 2.1, 3, 3.1, 4, 4.1, 5) aus unidirektionalen, bereits imprägnierten Tape-Streifen (6) gebildet sind, wobei die Tape-Streifen (6) einer jeden weiteren Lage jeweils parallel zueinander abgelegt sind und somit dieser Lage eine einheitliche Faserrichtung (f) geben, wobei zumindest zwei dieser weiteren Lagen jeweils unterschiedliche Faserrichtung (f) aufweisen, und wobei die Tape-Streifen (6) eine Länge in Faserrichtung (f) zwischen 120 und 400 mm und eine Breite quer zur Faserrichtung (f) zwischen 30 und 90 mm aufweisen; sowie Verfahren zur Herstellung eines solchen Prepreg-Stacks.
摘要:
A hybrid preform (200) comprises a bundle of unidirectionally aligned fibers (103), and at least one partial cut that extends part of the way (224, 226), but not all of the way, through a transverse cross section of the bundle of fibers (103) at at least one location along the length of the bundle (103).