Abstract:
In this process for winding a filament (22) around a winding support (6) having a general cylindrical shape with dome-shaped longitudinal ends and having a roll axis (8), the winding support (6) being held by a holding device (4) fixed to a base (16), the following steps occur in synchronization: (i) feeding a filament (22), by means of at least one primary feeding device (18) and at least one secondary feeding device (20), towards the winding support (6), (ii) translating the primary feeding device (18) and the secondary feeding device (20) with respect to the base (16) in parallel to the roll axis (8) of the winding support (6), (iii) rotating the winding support (6) around its roll axis (8) with respect to the base (16), wherein the movement of the primary feeding device (18) and the secondary feeding device (20) are symmetric one of another.
Abstract:
Bei einem Verfahren zur Herstellung eines - als Sandwichkonstruktion ausgebildeten - Hohlkörpers (1), insbesondere eines Flugzeugrumpfs (2), wobei eine Innenschicht (3) aus einer vorgebbaren Anzahl an Lagen (4) eines vorgebbaren wenigstens harzbenetzten Faserwerkstoffes (5), insbesondere umfassend Kohlenstofffasern, gebildet wird, wird zur einfachen, schnellen und kostengünstigen Bildung eines, auch großvolumigen, Hohlraums, welcher in Relation zu dessen Größe ein geringes Gewicht und eine hohe mechanische Belastbarkeit aufweist, vorgeschlagen, dass wenigstens eine erste Lage (6) der Innenschicht (3) schraublinienförmig und - im Wesentlichen über eine gesamte Länge des Hohlkörpers (1) - unterbrechungsfrei angeordnet wird.
Abstract:
A method is disclosed for reinforcement of thin wall hollow thermoplastic storage vessels with one or more wraps of continuous fibers. This method requires thermal bonding between the reinforcement fibers (14, 16) and the outer surface of the thermoplastic storage vessel (12) while the interior cavity of the storage vessel (12) is being pressurized (24) and heat is applied (22).
Abstract:
A vascular prosthesis is constructed from a structure having interconnected, helically oriented channel-porosity to allow oriented ingrowth of connective tissue into a wall of the prosthesis. The prosthesis can have a small internal diameter of 6 mm or less. Several different methods can be used to produce the prosthesis, including a fiber winding and extraction technique, a melt extrusion technique, and a particle and fiber extraction technique using either a layered method or a continuous method. Furthermore, mechanical properties of the prosthesis are matched with mechanical properties of the host vessel, thereby overcoming problems of compliance mismatch.
Abstract:
A process of fabricating a composite vessel includes the steps of: A) fabricating a thermoplastic liner for the vessel; B) overlaying a layer comprising fiber and a thermoplastic material (preferably by winding commingled filaments, rovings or yarns) onto the thermoplastic liner to obtain a composite intermediate structure (the fiber and thermoplastic material can be heated if desired during the overlaying, e.g. winding, step); C) heating the composite intermediate structure in a mold while applying at least one force thereto tending to urge the composite intermediate structure against and into shape of the interior walls of the mold; D) continuing step C) until the thermoplastic liner and the overlaid layer consolidate to form a composite vessel; E) cooling the mold and composite vessel until the composite vessel is solidified; and F) removing the formed composite vessel from the mold. The at least one force applied during step C) may be obtained by introducing gas pressure into the interior of the composite intermediate structure. Suitable materials for the thermoplastic material include: polyethylene, polypropylene, polybutylene terephthalate and polyethylene terephthalate. The resulting composite vessel exhibits superior mechanical and aesthetic properties.
Abstract:
Methods of reinforcing wooden supports, apparatuses for use in reinforcing wooden supports, and reinforced wooden supports are described. In a preferred implementation, the wooden support comprises a utility pole which is processed to provide a substantially, if not completely encapsulated and protected utility pole. In one aspect, the utility pole is encapsulated with a single layer of reinforcing fabric material which is provided over a substantial portion of an outer surface of the utility pole. In one implementation, the single layer is defined by an integral expanse of material which is spiral-wrapped over the body of the pole. In another implementation, the single layer is defined by a plurality of discrete units or sub-units of material which are provided over the body of the pole. In accordance with another aspect of the invention, mechanized or automated systems are provided to implement and provide the reinforced wooden supports. In one implementation, a rotation device receives the wooden support and effects a desired degree of rotation while the fabric reinforcing material is applied thereover. In one aspect, the fabric reinforcing material is spiral-wrapped by a reinforcing fabric holding device. In another aspect, the reinforcing fabric holding device enables discrete units or sub-units of material to be applied over the wooden support.
Abstract:
A method for restoring a degraded pipeline, the method comprising: removing a degraded part of an inner flow pipe of a pipeline leaving a space between two spaced-apart sections of the inner flow pipe; positioning a new pipe in the space; connecting the new pipe to the two spaced-apart sections of the inner flow pipe thereby re-establishing a flow channel through the inner flow pipe; the new pipe having a core pipe with a first strengthening wrap thereon, a second strengthening wrap around the first strengthening wrap, and a protective outer wrap on the second strengthening wrap.
Abstract:
The invention relates to a method for producing a hollow body (1), in particular an aircraft fuselage (2), designed as a sandwich construction, wherein an inner layer (3) comprises a specifiable number of plies (4) of a specifiable, at least resin-covered fiber material (5), in particular comprising carbon fibers, wherein in order to form a cavity, including a large-volume cavity, in a simple, fast, and low-cost manner, said cavity having a low weight and a high mechanical load capacity in relation to the size of the cavity, at least one first ply (6) of the inner layer (3) is arranged helically and continuously substantially over a whole length of the hollow body (1).
Abstract:
An aircraft part manufacturing device for automated composite lamination on a mandrel surface of a tool having a rotational axis includes a mechanical supporting structure that supports multiple material delivery heads. The tool is moveable and rotatable relative to the mechanical supporting structure. The mechanical supporting structure provides for axial translation of the material delivery heads relative to the mandrel surface while the mandrel surface is rotated for laying down courses of composite material over the entire mandrel surface of the tool. The position and movement of each of the plurality of material delivery heads is individually adjustable. Arm mechanisms provide motion of each material delivery head in a direction normal to the mandrel surface; rotation about an axis normal to the mandrel surface; circumferential position adjustment in a hoop direction relative to the mandrel surface; and axial position adjustment relative to the other material delivery heads.