Abstract: Provided is a resin-made impact absorption member including: an impact absorption portion which includes a fiber-reinforced resin material containing reinforcing fibers and a thermoplastic resin and has a hollow structure including an outer cylindrical portion and a hollow portion, in which the reinforcing fiber has an average fiber length of 1 mm to 100 mm, the thermoplastic resin has a fracture elongation of 10% or more, the fiber-reinforced resin material has a compressive elastic modulus of 10 GPa or more and a compressive strength of 150 MPa to 500 MPa, and in the impact absorption portion, a maximum value of a ratio L1/t1 of a distance L1 from a position of the center of gravity to the outer cylindrical portion on a same section in a sectional shape in a direction orthogonal to an impact absorption direction, to a thickness t1 of the outer cylindrical portion, is 40 or less.

Abstract: Provided is a resin-made impact absorption member including: an impact absorption portion which includes a fiber-reinforced resin material containing reinforcing fibers and a thermoplastic resin and has a hollow structure including an outer cylindrical portion and a hollow portion, in which the reinforcing fiber has an average fiber length of 1 mm to 100 mm, the thermoplastic resin has a fracture elongation of 10% or more, the fiber-reinforced resin material has a compressive elastic modulus of 10 GPa or more and a compressive strength of 150 MPa to 500 MPa, and in the impact absorption portion, a maximum value of a ratio L1/t1 of a distance L1 from a position of the center of gravity to the outer cylindrical portion on a same section in a sectional shape in a direction orthogonal to an impact absorption direction, to a thickness t1 of the outer cylindrical portion, is 40 or less.

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: 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: 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 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: 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 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: 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: 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.