Abstract: A vehicle body structure in which a vehicle body including an upper vehicle body and a lower vehicle body that are joined is constituted in whole or in part by a fiber-reinforced composite material, metal members are inserted into the respective upper vehicle body and lower vehicle body, the metal members being fastened to each other to form a joint portion, and at least two functional components are attached to the joint portion.

Abstract: A shock resistant member which is lightweight and has a high degree of freedom in shape, and excellent shock resistance, is provided. A shock resistant member including an open cross-section part and a rib part present in an inside of the open cross-section part, in which at least one of the open cross-section part and the rib part includes a carbon-fiber-reinforced composite material including a thermoplastic resin, and the other may include a thermoplastic resin, and in which an amount of the thermoplastic resin present in the shock resistant member is 30 to 500 parts by mass based on 100 parts by mass of carbon fibers, and an average fiber length of the carbon fibers is 3 to 100 mm.

Abstract: A vehicle floor structure, in which a main structure of the vehicle floor structure is a double deck structure including two sheets of panels formed from a fiber-reinforced thermoplastic composite material; in a region including the double deck structure, each of the panels includes at least two continuous reinforcing structures having a convex open cross-sectional shape; recesses are provided in at least two places of the reinforcing structures; and the panels are joined in such a manner that the reinforcing structures of the respective panels intersect with each other, and that the recesses provided in the reinforcing structures of the respective panels are fitted to each other.

Abstract: There is provided a fiber-reinforced composite material is constituted by reinforcing fibers with an average fiber length of 5 mm to 100 mm and a thermoplastic resin, in which in a viscoelastic characteristic that is defined by following formulas (1) and (2), an average value in a range of ?25° C. of the melting point of a matrix resin to +25° C. of the melting point of a matrix resin satisfies following formula (3): tan ?=G?/G???(1) tan ??=Vf×tan ?/(100?Vf)??(2) 0.01?tan ???0.2??(3) wherein G? represents a storage modulus (Pa) of the fiber-reinforced composite material, G? represents a loss modulus (Pa) of the fiber-reinforced composite material, and Vf represents a volume fraction (%) of the reinforcing fibers in the fiber-reinforced composite material.

Abstract: A vehicle body structure in which a vehicle body including an upper vehicle body and a lower vehicle body that are joined is constituted in whole or in part by a fiber-reinforced composite material, metal members are inserted into the respective upper vehicle body and lower vehicle body, the metal members being fastened to each other to form a joint portion, and at least two functional components are attached to the joint portion.

Abstract: Provided a vehicle skeleton member including: a portion obtained by joining a plurality of members constituted by a composite material of a thermoplastic resin and a reinforcing fiber, and an axis parallel to a front-rear direction and/or a right-left direction of the vehicle body is included in a joined surface by vibration welding.

Abstract: A vehicle floor structure, in which a main structure of the vehicle floor structure is a double deck structure including two sheets of panels formed from a fiber-reinforced thermoplastic composite material; in a region including the double deck structure, each of the panels includes at least two continuous reinforcing structures having a convex open cross-sectional shape; recesses are provided in at least two places of the reinforcing structures; and the panels are joined in such a manner that the reinforcing structures of the respective panels intersect with each other, and that the recesses provided in the reinforcing structures of the respective panels are fitted to each other.

Abstract: There is provided a vehicle skeleton member including a composite material of a thermoplastic resin and a carbon fiber, wherein the composite material is a unidirectional carbon-fiber composite material (A) that a form of the carbon fiber in the composite material is a continuous fiber aligned in one direction and/or a random carbon-fiber composite material (B) that a form of the carbon fiber in the composite material is a discontinuous fiber arranged two-dimensionally randomly.

Abstract: There is provided a joint body including: a reinforcing member having at least one random layer in which a chopped carbon fiber is randomly oriented in a thermoplastic resin, and at least one unidirectional material layer in which a continuous carbon fiber is unidirectionally arranged in a thermoplastic resin; and a reinforced member with an open sectional shape having at least one selected from the group consisting of a random layer and a unidirectional material layer, wherein the reinforcing member and the reinforced member are vibration-welded to form a hollow closed section.