Abstract: The present invention provides a bumper including: the bumper back beam made of a composite material, which has an arch-shaped collision surface, one side surface of which is formed so as to extend in a box shape from the collision surface, and a flange surface of which is formed so as to be bent outward from the side surface and made of the fiber-reinforced composite material, wherein the flange surface is fastened to a stay which is cut into a plurality of units based on a fastening point; and said stay, which is fastened to the bumper back beam, wherein a fastening hole corresponding to the fastening point is formed as an elongate hole.

Abstract: Disclosed is a battery pack case assembly for an electric or hybrid vehicle and a method for manufacturing the same. The battery pack case assembly includes a case body and a cover. The case body receives a battery pack, and the cover is coupled to the case body. The case body is formed of a plastic composite in which a long fiber or a blend of a long fiber and a continuous fiber is used as a reinforcing fiber in a plastic matrix. A separate reinforced member is bonded to both side bracket parts for coupling to a vehicle body, and is formed of a plastic composite in which a long fiber, a continuous, or a blend of a long fiber and a continuous fiber is used as the reinforcing fiber in the plastic matrix.

Abstract: The present invention relates to a bumper back beam being equipped with a fiber composite reinforcing material with hollow section inside and a bumper having the same. The bumper back beam comprise a body formed with a synthetic resin, and a fiber composite reinforcing material with hollow section that is fastened inside the body, wherein the bumper back beam, as being built inside a bumper cover, reduces impact coming in from outside. A bumper back beam according to the present invention comprised as described above has high reliability, by having excellent ability to absorb impact energy because cracks almost do not occur during collision since it not only provides satisfactory strength and stiffness but also has high elongation with synthetic resin and fiber composite reinforcing materials generating synergies, and especially by having excellent impact resistance since fiber composite reinforcing materials take the shape of a hollow section.

Abstract: Disclosed is a battery pack case assembly for an electric or hybrid vehicle. The battery pack case assembly includes a case body and a cover. The case body receives a battery pack, and the cover is coupled to the case body. The case body is formed of a plastic composite in which a long fiber or a blend of a long fiber and a continuous fiber is used as a reinforcing fiber in a plastic matrix. A separate reinforced member is bonded to both side bracket parts for coupling to a vehicle body, and is formed of a plastic composite in which a long fiber, a continuous, or a blend of a long fiber and a continuous fiber is used as the reinforcing fiber in the plastic matrix.

Abstract: According to one embodiment of the present invention, a sandwich structure welded by high-frequency induction heating comprises: a honeycomb core; a first skin sheet and a second skin sheet formed at either side of the honeycomb core, respectively; and conductors to be heated, which are arranged at one side of each of the first skin sheet and second skin sheet, and which melt the interfaces of the first skin sheet and second skin sheet by high-frequency induction heating so as to enable the first skin sheet and second skin sheet to be adhered to either side of the honeycomb core, respectively.

Abstract: Disclosed is a battery pack case assembly for an electric or hybrid vehicle and a method for manufacturing the same. The battery pack case assembly includes a case body and a cover. The case body receives a battery pack, and the cover is coupled to the case body. The case body is formed of a plastic composite in which a long fiber or a blend of a long fiber and a continuous fiber is used as a reinforcing fiber in a plastic matrix. A separate reinforced member is bonded to both side bracket parts for coupling to a vehicle body, and is formed of a plastic composite in which a long fiber, a continuous, or a blend of a long fiber and a continuous fiber is used as the reinforcing fiber in the plastic matrix.