Abstract: A fiber structure body includes a several fiber layers stacked in a stacking direction and has a multi-axial orientation that includes axial-force directional yarns, orthogonal directional yarns, and intersecting yarns. The fiber structure body includes a flat plate portion and a bend portion that is bent to the flat plate portion and includes a surface intersecting with a surface of the flat plate portion. The axial-force directional yarns are made of continuous fiber of reinforced fiber. Of yarns that form the bend portion and are other than the axial-force directional yarns, yarns that form at least one axis of the bend portion are provided by spun yarns made of discontinuous fiber.

Abstract: A pressure vessel includes a liner including a cylindrical body and a dorm portion continuous with at least one end of the body in an axial direction and includes a reinforced fiber sheet covering an outer side of the liner and made of fabric. The reinforced fiber sheet includes first yarns arranged on the body and the dorm portion such that yarn main axes of the first yarns extend in the circumferential direction of the liner and second yarns arranged on the body and the dorm portion such that yarn main axes of the second yarns extend in the axial direction of the liner. A total number of the first yarns or the second yarns that exist per unit length in the axial direction of the liner is smaller in the dorm portion than in the body.

Abstract: A FRP tubular body includes a tubular fiber structure formed by winding a reinforced fiber sheet made of fabric. The reinforced fiber sheet includes first reinforced fiber bundles arranged such that a yarn main axis direction extends in a circumferential direction of the fiber structure and second reinforced fiber bundles arranged such that a yarn main axis direction extends in an axial direction of the fiber structure. The reinforced fiber sheet includes a starting end, a finishing end, and a general portion located between the starting end and the finishing end. The general portion includes the first reinforced fiber bundles and the second reinforced fiber bundles. At least one of the starting end or the finishing end is a decreased portion that is smaller than the general portion in an amount of reinforced fibers per unit length in the circumferential direction of the fiber structure.

Abstract: A fiber structure body includes a several fiber layers stacked in a stacking direction and has a multi-axial orientation that includes axial-force directional yarns, orthogonal directional yarns, and intersecting yarns. The fiber structure body includes a flat plate portion and a bend portion that is bent to the flat plate portion and includes a surface intersecting with a surface of the flat plate portion. The axial-force directional yarns are made of continuous fiber of reinforced fiber. Of yarns that form the bend portion and are other than the axial-force directional yarns, yarns that form at least one axis of the bend portion are provided by spun yarns made of discontinuous fiber.

Abstract: An impact energy absorbing member includes an energy absorbing portion and an attachment portion. The attachment portion is fastened to the bumper reinforcement using a fastener, the fastener extending through the attachment portion and a wall of the bumper reinforcement and including an axis that extends in a direction intersecting an axial direction of the energy absorbing portion. The attachment portion and the energy absorbing portion are in a positional relationship in which the energy absorbing portion does not overlap the fastener when the impact energy absorbing member is viewed in a direction from the bumper reinforcement toward the energy absorbing portion in a vehicle front-rear direction.

Abstract: A method for manufacturing a pressure container includes thermally curing a thermosetting resin with which a fiber-reinforced base material is impregnated. The thermally curing step includes thermally curing the thermosetting resin by heat exchange with a fluid supplied to an inside of a liner; and thermally curing the thermosetting resin by heating from an outer surface side of the fiber-reinforced base material. A temperature of the fluid supplied to the inside of the liner is higher than a temperature of the helating from the outer surface side of the fiber-reinforced base material so that the thermosetting resin is thermally cured from an inner surface side of the fiber-reinforced base material adjacent to the liner before the outer surface side of the fiber-reinforced base material.

Abstract: A pressure vessel includes a liner including a cylindrical body and a dorm portion continuous with at least one end of the body in an axial direction and includes a reinforced fiber sheet covering an outer side of the liner and made of fabric. The reinforced fiber sheet includes first yarns arranged on the body and the dorm portion such that yarn main axes of the first yarns extend in the circumferential direction of the liner and second yarns arranged on the body and the dorm portion such that yarn main axes of the second yarns extend in the axial direction of the liner. A total number of the first yarns or the second yarns that exist per unit length in the axial direction of the liner is smaller in the dorm portion than in the body.

Abstract: A FRP tubular body includes a tubular fiber structure formed by winding a reinforced fiber sheet made of fabric. The reinforced fiber sheet includes first reinforced fiber bundles arranged such that a yam main axis direction extends in a circumferential direction of the fiber structure and second reinforced fiber bundles arranged such that a yarn main axis direction extends in an axial direction of the fiber structure. The reinforced fiber sheet includes a starting end, a finishing end, and a general portion located between the starting end and the finishing end. The general portion includes the first reinforced fiber bundles and the second reinforced fiber bundles. At least one of the starting end or the finishing end is a decreased portion that is smaller than the general portion in an amount of reinforced fibers per unit length in the circumferential direction of the fiber structure.

Abstract: A fiber structure that includes a liner, and a fiber reinforcement base material formed of a fabric. The fiber reinforcement base material externally covers a body portion and a dome-shaped portion of the liner, and includes first yarns and second yarns. The first yarns are arranged such that a direction in which a yarn main axis of each of the first yarns in the body portion and the dome-shaped portion proceeds is a circumferential direction of the liner. The second yarns are arranged such that a direction in which a yarn main axis of each of the second yarns in the body portion proceeds is an axial direction of the body portion and that a direction in which a yarn main axis of a portion of each of the second yarns arranged in the dome-shaped portion proceeds is an axial direction of the dome-shaped portion.

Abstract: A fiber structure body is a multi-layered fabric. The multi-layered fabric includes first yarn layers including first yarns, and second yarn layers including second yarns that intersect with the first yarns. The first yarn layers and the second yarn layers are stacked on top of each other and bound by binder yarns. The fiber structure body includes a main body in which all yarn layers are bounded by the binder yarns, and a branch portion continuous with the main body and including a first formation and a second formation. A main axis of each of closest second yarns closest to a branching boundary line among the second yarns of the main body is parallel to the branching boundary line. The branching boundary line extends along a location from which the first formation and the second formation of the branch portion start branching out.

Abstract: A fiber construct comprises a binding thread that binds all first fiber layers and second fiber layers in a laminating direction in a first flat portion, The binding thread is in any one of a mode of extending straight in a bent portion and a second flat portion, a mode of binding the first fiber layers and the second fiber layers partially in the laminating direction in the bent portion and the second flat portion, and a mode of being absent in the bent portion and the second flat portion. In the bent portion and the second flat portion, a second yarn is in any one of a mode of engaging with only the first yarn of a specific one of the first fiber layers and a mode of binding the first fiber layers partially in the laminating direction.

Abstract: A multilayer fabric includes a binding portion in which weft fiber layers stacked in a thickness-wise direction are all bound by warps and a non-binding portion including a slit where a fifth fiber layer and a seventh fiber layer, which are the weft fiber layers, are not bound by warps. The multilayer fabric includes an intersection formed at a boundary of the binding portion and the non-binding portion. The intersection is formed by intersecting the warps that are adjacent in a second direction.

Abstract: A fabric laminate used as a reinforcing base material of a fiber-reinforced composite is constituted by laminating fabrics having warp yarns and weft yarns. Each warp yarn has a diameter-changing portion, in which the diameter of the yarn gradually changes in the yarn longitudinal direction in the vicinity of one end in the yarn longitudinal direction of the warp yarn.

Abstract: This fiber wound body has a plurality of reinforcing fiber yarns wound around a winding axis, each of the reinforcing fiber yarns having a thickness gradient portion in which the fiber content is uniform along the longitudinal direction of the yarn and the thickness gradually changes.

Abstract: A fiber structure includes a first corner section, which is a boundary section between a first structural portion and a second structural portion, a second corner section, which is a boundary section between the first structural portion and a third structural portion, and a third corner section, which is a boundary section between the second structural portion and the third structural portion. A first yarn that extends continuously in the first structural portion and the second structural portion is bent at the first corner section. A second yarn that extends continuously in the first structural portion and the third structural portion is bent at the second corner section. At least one of the first yarn and the second yarn, which extend continuously in the second structural portion and third structural portion, is bent at the third corner section.

Abstract: A fiber structure includes a first fiber layer including first reinforcement fiber bundles extending in a first yarn main axis direction, a second fiber layer including second reinforcement fiber bundles extending in a second yarn main axis direction that is orthogonal to the first yarn main axis direction, and auxiliary yarns that join the first fiber layer with the second fiber layer in a stacking direction of the first fiber layer and the second fiber layer. At least either one of the first reinforcement fiber bundles and the second reinforcement fiber bundles each include a core yarn and a covering yarn spirally wound around the core yarn. A covering angle, which is an orientation angle of the covering yarn, corresponds to a direction that differs from the first yarn main axis direction and the second yarn main axis direction.

Abstract: A textile laminate is twisted around a torsion axis extending in a straight line in a longitudinal direction of the textile laminate. Further, the warps of second to fourth fiber layers, which constitute the textile laminate, are oriented to intersect with the torsion axis. The textile laminate is provided with a pair of side edge sections positioned at opposite ends of the torsion axis in the axial direction, and a torsional edge section that connects the side edge sections to each other. The warps of the unidirectional textile intersecting with the torsion axis as viewed from the direction orthogonal to the torsion axis extend in straight lines from the torsion axis toward the torsional edge sections.

Abstract: A fiber structure that includes a liner, and a fiber reinforcement base material formed of a fabric. The fiber reinforcement base material externally covers a body portion and a dome-shaped portion of the liner, and includes first yarns and second yarns. The first yarns are arranged such that a direction in which a yarn main axis of each of the first yarns in the body portion and the dome-shaped portion proceeds is a circumferential direction of the liner. The second yarns are arranged such that a direction in which a yarn main axis of each of the second yarns in the body portion proceeds is an axial direction of the body portion and that a direction in which a yarn main axis of a portion of each of the second yarns arranged in the dome-shaped portion proceeds is an axial direction of the dome-shaped portion.

Abstract: A fibrous structure includes a main plate and a sub-plate. The main plate, which is formed by a multi-layer textile, includes a plurality of stacked fiber layers. Each fiber layer includes main plate warps and main plate wefts. The sub-plate, which is formed by a multi-layer textile, includes a plurality of stacked fiber layers. Each fiber layer includes sub-plate warps and sub-plate wefts. The main plate and the sub-plate are integrally woven with each other in a state intersecting each other. The main plate wefts and the sub-plate wefts have a smaller volume density at an intersecting portion where the main plate and the sub-plate intersect than a portion separate from the intersecting portion.

Abstract: A fiber structure for a fiber-reinforced composite material includes a section in which a width varies continuously along a central axis in a plan view. In a section in which the width increases continuously along the central axis, discontinuous fibers are aligned radially along the central axis, and both a thickness of the fiber structure and a density of the discontinuous fibers are uniform.