Abstract: A first reinforcing fiber layer is formed of reinforcing fibers which are wound around an outer periphery of a mandrel. The reinforcing fibers are aligned in parallel to a direction (+? direction) in which the reinforcing fibers intersect with an annular direction (0° direction) of the mandrel, and seamlessly continue in the annular direction of the mandrel by an amount of at least one rotation.

Abstract: In a composite lightweight fitting, at least one reinforced fiber layer (3a) of reinforced fiber layers (3) includes a reinforced fiber bundle (4) formed by aligning a large number of reinforced fibers into a belt-like shape, the reinforced fiber bundle (4) including a round portion (4a) arranged along a periphery of a through-hole (2). The round portion (4a) of the reinforced fiber bundle (4) is twisted.

Abstract: A toroidal pressure vessel having extremely high pressure resistance has laminated latitudinal reinforcing fiber layers to improve a strength in a latitudinal direction of the pressure vessel. Moreover, putting reinforcing fibers constituting those laminated latitudinal reinforcing fiber layers in continuity enables further improvement of strength in the latitudinal direction of the pressure vessel, for example compared with a case where the reinforcing fibers are divided for each layer.

Abstract: Provided is a first reinforcing fiber layer (11) formed of reinforcing fibers which are wound around an outer periphery of a mandrel (20), aligned in parallel to a direction (+? direction) in which the reinforcing fibers intersect with an annular direction (0° direction) of the mandrel (20), and seamlessly continue in the annular direction of the mandrel (20) by an amount of at least one rotation.

Abstract: Provided is a toroidal pressure vessel having extremely high pressure resistance. Laminating latitudinal reinforcing fiber layers (32) enables to improve a strength in a latitudinal direction of a pressure vessel (1). Moreover, putting reinforcing fibers (32a) constituting those laminated latitudinal reinforcing fiber layers (32) in continuity enables to further improve the strength in the latitudinal direction of the pressure vessel (1), for example compared with a case where the reinforcing fibers are divided for each layer.

Abstract: A novel process for producing a dry preform for a composite material takes advantage of the fact that a reinforcing filament assembly, when consisting of a fiber reinforcement layer a, formed by stringing a first set of parallel strands of fiber reinforcement over a part or all of the plane within any desired shape along the straight axis 2, and a fiber reinforcement layer b, formed by stringing a second set of parallel strands of fiber reinforcement over the plane at an angle ? with respect to the straight axis 2, such that 0°<?<180°, the part of the reinforcing filament assembly that consists solely of the fiber reinforcement b can be deformed as desired. According to this process, strands c of fiber reinforcement are strung using a fiber reinforcement string jig as shown in FIGS. 8(A) and 8(B). The layers of the strung strands of fiber reinforcement are brought together by a simple means such as stitching.

Abstract: A preform for a fiber-reinforced composite material including a bent portion along a curved line for bending, a flange portion corresponding to an outer circumferential portion, and a semi-cylindrical portion formed by bending an inner circumferential portion along the curved line for bending located in a flat plane or a curved plane region. The preform is formed from a precursor having a predetermined extension. The outer circumferential portion corresponds to a first region where a first plurality of reinforced fibers is partially disposed in parallel along the curved line for bending. The inner circumferential portion corresponds to a second region constituted solely of a second plurality of reinforced fibers disposed throughout the entire area, so as to intersect the first plurality of reinforced fibers at a predetermined angle in the first region.

Abstract: A unidirectional three dimensional fiber structure is provided which does not require weaving, displays a high level of interlayer strength and does not suffer from cracking, and which can also be easily produced with any arbitrary cross-section. A unidirectional three dimensional fiber structure is produced by inserting a plurality of long fibers which have been aligned unidirectionally into an inlet at one end of a cylindrical die with a plurality of needle holes in the peripheral walls thereof, and then performing needlepunch through the needle holes while drawing the plurality of long fibers out from an outlet at the opposite end of the cylindrical die.

Abstract: Technical Field of the Invention: A structural member required to have a prescribed strength in an aircraft, an automobile, a vessel or a constructed structure, etc., especially in a circular bore portion or a curved portion such as a wing or a body of an aircraft. Technical Problem: A preform for a fiber-reinforced composite material to be used as a structural member of a fiber-reinforced composite material having a curved portion is to be manufactured through a low-cost mass production.

Abstract: The present invention provides a fiber base material for constituting a composite material for increasing interlaminar strength (peeling strength, out-of-plane strength, post-impact strength), improving impregnation efficiency of a matrix in a composing process and preventing a resin-rich portion that affects the strength. A fiber base material for constituting a composite material comprising a single layer or a plurality of layers of a solid-shape base material constituted of a woven or knitted continuous fiber, wherein the base material is raised for enhancing interlaminar or bonding plane strength, improving permeability of a matrix at a surface and an interior portion thereof, and increasing plane smoothness.

Abstract: A novel process for producing a dry preform for a composite material takes advantage of the fact that a reinforcing filament assembly, when consisting of a fiber reinforcement layer a, formed by stringing a first set of parallel strands of fiber reinforcement over a part or all of the plane within any desired shape along the straight axis 2, and a fiber reinforcement layer b, formed by stringing a second set of parallel strands of fiber reinforcement over the plane at an angle &thgr; with respect to the straight axis 2, such that 0°<&thgr;<180°, the part of the reinforcing filament assembly that consists solely of the fiber reinforcement b can be deformed as desired. According to this process, strands c of fiber reinforcement are strung using a fiber reinforcement string jig as shown in FIGS. 8(A) and 8(B). The layers of the strung strands of fiber reinforcement are brought together by a simple means such as stitching.

Abstract: A unidirectional three dimensional fiber structure is provided which does not require weaving, displays a high level of interlayer strength and does not suffer from cracking, and which can also be easily produced with any arbitrary cross-section. A unidirectional three dimensional fiber structure is produced by inserting a plurality of long fibers which have been aligned unidirectionally into an inlet at one end of a cylindrical die with a plurality of needle holes in the peripheral walls thereof, and then performing needlepunch through the needle holes while drawing the plurality of long fibers out from an outlet at the opposite end of the cylindrical die.

Abstract: Textile structures for producing structural members such as reinforced spars of composite material and a method for producing the textile structures. In the textile structure at least two textile planar members, or plates, are integrally joined together by textile filaments such that the planes of the members intersect each other, at least one member being formed of layers of textile filaments which extend obliquely in at least two directions in a brace fashion with respect to the longitudinal and transverse directions of the member while the remaining members are each formed of layers of textile filaments extending along the longitudinal, transverse and vertical directions of the member.

Abstract: Textile structures for producing structural members such as reinforced spars of composite material and a method for producing the textile structures. In the textile structure at least two textile planar members, or plates, are integrally joined together by textile filaments such that the planes of the members intersect each other, at least one member being formed of layers of textile filaments which extend obliquely in at least two directions in a brace fashion with respect to the longitudinal and transverse directions of the member while the remaining members are each formed of layers of textile filaments extending along the longitudinal, transverse and vertical directions of the member.

Abstract: A fibrous structure for reinforcing a composite material which is a bottomed hollow pillar-shaped body having fins extending outwardly from a peripheral side wall of the body. The composite material-reinforcing fibrous structure consists of a plurality of longitudinally adjoining yarn section, each section being a plurality of layers, or tiers, of a first continuous yarn. A second continuous yarn is disposed substantially perpendicularly to the layers of first continuous yarn, and a third continuous yarn passes into loops formed in the second continuous yarn adjacent an outside layer of the first continuous yarn. The second continuous yarn functions as a common longitudinal component yarn in coextensive portions of the adjoining yarn sections and as an independent longitudinal component yarn in portions of the yarn sections which do not adjoin other yarn sections.

Abstract: A textile or filamentary structure for a reinforced composite material comprising a first filament (1) which is disposed in multiple turns or convolutions in a first plane (X-Y) without forming a cut, free or exposed end at each turn and then disposed as a subsequent lamination in another parallel filament-disposition plane in which it extends in a path different from the path of filament disposition in said first plane, whereafter it repeats the lamination in successive planes, a second filament (2) sinuously extending in planes (Y-Z) which intersect the planes of disposition of the first filament, without forming a cut, free or exposed end at each turn, and a third filament (3) sinuously extending in successive parallel planes (X-Y) adjacent the laminations of said first filament (1), passing through loops (5) formed by said second filament (2), thereby retaining the same in the body of the structure.