Abstract: The purpose of the present invention is to inhibit a decrease in strength attribute to the interface between a simple-shape portion and a complicated-shape portion. This fiber-reinforced resin composite material comprises: a simple-shape portion formed from at least one sheet-shaped prepreg material obtained by impregnating reinforcing fibers with a resin; and a complicated-shape portion obtained by impregnating reinforcing fibers with a resin, the complicated-shape portion having been integrated with the simple-shape portion. The resin used for the prepreg material comprised the same components as the resin used for the complicated-shape portion.

Abstract: The purpose of the present invention is to inhibit a decrease in strength attribute to the interface between a simple-shape portion and a complicated-shape portion. This fiber-reinforced resin composite material comprises: a simple-shape portion formed from at least one sheet-shaped prepreg material obtained by impregnating reinforcing fibers with a resin; and a complicated-shape portion obtained by impregnating reinforcing fibers with a resin, the complicated-shape portion having been integrated with the simple-shape portion. The resin used for the preprg material comprised the same components as the resin used for the complicated-shape portion.

Abstract: The purpose of the present invention is to inhibit a decrease in strength attribute to the interface between a simple-shape portion and a complicated-shape portion. This fiber-reinforced resin composite material comprises: a simple-shape portion formed from at least one sheet-shaped prepreg material obtained by impregnating reinforcing fibers with a resin; and a complicated-shape portion obtained by impregnating reinforcing fibers with a resin, the complicated-shape portion having been integrated with the simple-shape portion. The resin used for the preprg material comprised the same components as the resin used for the complicated-shape portion.

Abstract: A robot hand having an attachment portion that is held when incorporated into a robot includes CFRP laminated to each other and a vibration-damping elastic layer that is disposed between the CFRP layer and the CFRP layer. The vibration-damping elastic layer includes viscoelastic resin regions including a viscoelastic resin and a high-rigidity resin region including high-rigidity resin. The viscoelastic resin regions and the high-rigidity resin region are alternately arranged along the direction intersecting the longitudinal direction of the CFRP layer in the attachment portion. The viscoelastic resin regions improve vibration-damping properties on the robot hand. As the viscoelastic resin regions and the high-rigidity resin region having relatively higher rigidity are alternately arranged along the direction intersecting the longitudinal direction of the CFRP layers, flexural rigidity along the longitudinal direction of the CFRP layer is improved.

Abstract: Provided are a fiber-reinforced composite material capable of achieving excellent CAI, ILSS, and bending fracture toughness concurrently at high levels, and maintaining a high glass transition temperature of the resin material therein, and prepreg and a benzoxazine resin composition therefor. The composition contains, at a particular ratio, (A) a compound having in its molecule a benzoxazine ring represented by formula (1), (B) an epoxy resin, (C) a curing agent, (D) a toughness improver, and (E) polyamide 12 particles of a particular particle size, and component (D) is dissolved: (R1: C1-C12 chain alkyl group or the like, and H is bonded to at least one of Cs of the aromatic ring at o- or p-position with respect to the carbon atom to which the oxygen atom is bonded).

Abstract: A robot hand having an attachment portion that is held when incorporated into a robot includes CFRP layers laminated to each other and a vibration-damping elastic layer that is disposed between the CFRP layer and the CFRP layer. The vibration-damping elastic layer includes viscoelastic resin regions including a viscoelastic resin and a high-rigidity resin region including high-rigidity resin. The viscoelastic resin regions and the high-rigidity resin region are alternately arranged along the direction intersecting the longitudinal direction of the CFRP layer in the attachment portion. The viscoelastic resin regions improve vibration-damping properties on the robot hand. As the viscoelastic resin regions and the high-rigidity resin region having relatively higher rigidity are alternately arranged along the direction intersecting the longitudinal direction of the CFRP layers, flexural rigidity along the longitudinal direction of the CFRP layer is improved.

Abstract: A molded carbon-fiber-reinforced plastic (molded CFRP) includes a plurality of carbon fiber layers having carbon fibers, a resin body in which the carbon fiber layers are buried, and pins which are inserted and fixed in a plurality of holes formed in the resin body so as to extend through the carbon fiber layers. In the molded CFRP, the pins can be inserted and fixed in the plurality of holes formed in the resin body so as to extend through the carbon fiber layers, to thereby improve interlaminar toughness of the molded CFRP.

Abstract: The invention provides a benzoxazine resin composition having excellent resistance to heat and moisture and providing excellent handleability when made into prepreg, and prepreg and a fiber-reinforced composite material prepared from the composition. The composition contains (A) a compound having in its molecule a benzoxazine ring represented by the formula (1), (B) an epoxy resin, (C) a curing agent, and (D) a toughness improver: (R1: C1 to C12 chain alkyl group, etc., and H is bonded to at least one of C of the aromatic ring at o- or p-position to the carbon atom to which the oxygen atom is bonded).