Abstract: A molding base material has at least a fiber-reinforced resin prepreg layer, a fiber paper layer, and a partition layer interposed between the prepreg layer and the fiber paper layer; a molded product obtained using the same; and a production method therefor. The resulting product makes it possible to achieve high thermal resistance and heat insulation as well as improved overall space efficiency and weight reduction in a fiber-reinforced resin molded product.

Abstract: This composite structure is characterized in that: an internally inserted component, which is molded from a resin material having a tensile elongation of 10% or more, is placed inside a metal member having a hollow closed cross-section such that an external load can be received by both the internally inserted component and the metal member, and the outer shape of the internally inserted component occupies 50% or more relative to the hollow closed cross-section of the metal member as projection area ratio. By disposing the resin-made internally inserted component having a specific toughness at a specified state inside the metal member having a hollow closed cross-section, especially when a collision load occurs, the metal member undergoes ductile deformation and the internally inserted component also deforms correspondingly, and thus the waveform of the load-displacement curve can approach an ideal rectangular waveform, and excellent impact energy absorbing performance can be exhibited.

Abstract: A method for measuring a fiber orientation degree includes: irradiating a sample formed of a composite material containing discontinuous carbon fibers with an X-ray to acquire an X-ray diffraction image; calculating an angle (2?)A of a peak originating from a crystal face of graphite; calculating a correction coefficient ? of a thickness of the sample; calculating an upper limit (2?)B of the peak of the crystal face of graphite; calculating a diffraction sensitivity IC(?) of the peak originating from the crystal face of graphite by correcting an integrating range with the correction coefficient ? and integrating the X-ray diffraction image with respect to a diffraction angle (2?); and calculating a fiber orientation degree Sd(?) by the method of Hermans from the diffraction sensitivity IC(?).

Abstract: A method for producing a preparation for fiber length measurement includes: a preliminary dispersion process of adding fibers and a dispersion medium with a viscosity of 500 Pa·s to 10,000 Pa·s to a sealable container so as to give a concentration of the fibers of 0.1% by mass or less and shaking the container to prepare a preliminary dispersion liquid; a dispensing process of dispensing part of the preliminary dispersion liquid to another sealable container; a dilution process of adding the dispersion medium to the dispensed preliminary dispersion liquid so as to give a concentration of the fibers of 0.005% by mass or less and shaking the container to prepare a dispersion liquid for measuring fiber length; and a casting process of spreading part of the dispersion liquid for measuring fiber length onto a base having light transparency.

Abstract: This composite structure is characterized in that: an internally inserted component, which is molded from a resin material having a tensile elongation of 10% or more, is placed inside a metal member having a hollow closed cross-section such that an external load can be received by both the internally inserted component and the metal member, and the outer shape of the internally inserted component occupies 50% or more relative to the hollow closed cross-section of the metal member as projection area ratio. By disposing the resin-made internally inserted component having a specific toughness at a specified state inside the metal member having a hollow closed cross-section, especially when a collision load occurs, the metal member undergoes ductile deformation and the internally inserted component also deforms correspondingly, and thus the waveform of the load-displacement curve can approach an ideal rectangular waveform, and excellent impact energy absorbing performance can be exhibited.

Abstract: A method for producing a preparation for fiber length measurement includes: a preliminary dispersion process of adding fibers and a dispersion medium with a viscosity of 500 Pa·s to 10,000 Pa·s to a sealable container so as to give a concentration of the fibers of 0.1% by mass or less and shaking the container to prepare a preliminary dispersion liquid; a dispensing process of dispensing part of the preliminary dispersion liquid to another sealable container; a dilution process of adding the dispersion medium to the dispensed preliminary dispersion liquid so as to give a concentration of the fibers of 0.005% by mass or less and shaking the container to prepare a dispersion liquid for measuring fiber length; and a casting process of spreading part of the dispersion liquid for measuring fiber length onto a base having light transparency.

Abstract: A method for measuring a fiber orientation degree includes: irradiating a sample formed of a composite material containing discontinuous carbon fibers with an X-ray to acquire an X-ray diffraction image; calculating an angle (2?)A of a peak originating from a crystal face of graphite; calculating a correction coefficient ? of a thickness of the sample; calculating an upper limit (2?)B of the peak of the crystal face of graphite; calculating a diffraction sensitivity IC(?) of the peak originating from the crystal face of graphite by correcting an integrating range with the correction coefficient ? and integrating the X-ray diffraction image with respect to a diffraction angle (2?); and calculating a fiber orientation degree Sd(?) by the method of Hermans from the diffraction sensitivity IC(?).

Abstract: To provide a vehicle floor panel having a certain rigidity and being less prone to deformation during manufacturing and deformation when the vehicle floor panel installed in a vehicle is subjected to loads in various directions from outside the vehicle. A vehicle floor panel includes a floor panel main body made of a fiber-reinforced resin, a plurality of recesses 23-1 to 23-7 protruding on one of a lower surface 22 and upper surface of the floor panel main body and depressed on the other of the surfaces and arranged by being spaced apart from one another, and ribs 24-1 to 24-12 connecting two adjacent ones of the recesses on the one of the surfaces of the floor panel main body.

Abstract: To provide a vehicle floor panel having a certain rigidity and being less prone to deformation during manufacturing and deformation when the vehicle floor panel installed in a vehicle is subjected to loads in various directions from outside the vehicle. A vehicle floor panel includes a floor panel main body made of a fiber-reinforced resin, a plurality of recesses 23-1 to 23-7 protruding on one of a lower surface 22 and upper surface of the floor panel main body and depressed on the other of the surfaces and arranged by being spaced apart from one another, and ribs 24-1 to 24-12 connecting two adjacent ones of the recesses on the one of the surfaces of the floor panel main body.

Abstract: A reinforcing fiber composite material characterized by comprising discontinuous reinforcing fibers containing discontinuous reinforcing fiber aggregates and a matrix resin, wherein a fan-shaped discontinuous reinforcing fiber aggregate (A) is contained at an amount of 5% by weight or more in the discontinuous reinforcing fibers, and wherein the fan-shaped discontinuous reinforcing fiber aggregate (A) has a fan-like section in which an aspect ratio at least at one end part of a discontinuous reinforcing fiber aggregate (the width of the discontinuous reinforcing fiber aggregate/the thickness of the discontinuous reinforcing fiber aggregate) is 1.5 times or more relative to an aspect ratio at a narrowest part at which the width of the discontinuous reinforcing fiber aggregate is smallest when the discontinuous reinforcing fiber aggregate is projected two-dimensionally.

Abstract: An energy-absorbing member has a structure in which a plurality of fiber reinforced resin layers are layered in a thickness direction of said member and includes as the plurality of fiber reinforced resin layers, at least a plurality of unidirectional materials each including unidirectionally aligned reinforcing fibers and a resin and a plurality of cross materials each including a reinforcing fiber woven fabric and a resin, wherein lengths of the plurality of unidirectional materials in an external-loading direction are sequentially changed.

Abstract: A fiber-reinforced resin structure having a hole into which a connector that connects to another member is inserted, wherein a bearing strength at a part of an inside surface of the hole on which a load from the connector acts, represented by a stress at which displacement of the part of the inside surface of the hole starts increasing even without the load acting on the part of the inside surface of the hole from the connector increasing, is less than a breaking strength of a fiber-reinforced resin constituting that part of the structure.

Abstract: An energy-absorbing member has a structure in which a plurality of fiber reinforced resin layers are layered in a thickness direction of said member and includes as the plurality of fiber reinforced resin layers, at least a plurality of unidirectional materials each including unidirectionally aligned reinforcing fibers and a resin and a plurality of cross materials each including a reinforcing fiber woven fabric and a resin, wherein lengths of the plurality of unidirectional materials in an external-loading direction are sequentially changed.

Abstract: A structure for a passenger vehicle interior is a structure for constituting the vehicle interior of a passenger vehicle, is formed in a monocoque structure in which the entire structure from the front side to the rear side of the vehicle interior is integrally formed by a fiber-reinforced resin, has a bowl-shaped structure part which is provided at least on the front side among the front side and the rear side of the structure and which opens toward the rear side, and has a side-wall part formed as a vertical wall that is continuous with the bowl-shaped structure part and extends in a front-rear direction of the structure, at each of both side parts of the structure, and a manufacturing method therefor.

Abstract: A fiber-reinforced resin structure having a hole into which a connector that connects to another member is inserted, wherein a bearing strength at a part of an inside surface of the hole on which a load from the connector acts, represented by a stress at which displacement of the part of the inside surface of the hole starts increasing even without the load acting on the part of the inside surface of the hole from the connector increasing, is less than a breaking strength of a fiber-reinforced resin constituting that part of the structure.

Abstract: A structure for a passenger vehicle interior is a structure for constituting the vehicle interior of a passenger vehicle, is formed in a monocoque structure in which the entire structure from the front side to the rear side of the vehicle interior is integrally formed by a fiber-reinforced resin, has a bowl-shaped structure part which is provided at least on the front side among the front side and the rear side of the structure and which opens toward the rear side, and has a side-wall part formed as a vertical wall that is continuous with the bowl-shaped structure part and extends in a front-rear direction of the structure, at each of both side parts of the structure, and a manufacturing method therefor.

Abstract: An FRP panel for an automobile, comprising a panel element to which a difference in rigidity and/or a difference in strength is provided between a first FRP layer on a first surface side and a second FRP layer on a second surface side on the opposite side of the first surface. The FRP panel for the automobile having a crushable structure suitable for absorbing impact can be realized, and the impact on a pedestrian in collision can be suppressed by properly absorbing the impact to protect the pedestrian.