A door structure includes a door panel, a first beam member, a first bracket attached to a rear end portion of the first beam member, a second beam member formed separately from the first beam member, a second bracket attached to a rear end portion of the second beam member and formed separately from the first bracket, and a coupling member, to which the first bracket and the second bracket are fixed to be arranged side by side, and which is attached to the door panel. The coupling member includes an extending portion extending in a vehicle width direction between the first bracket and the second bracket.

A vehicle door assembly includes an inner door panel, a pillar panel and a first cushioning pad. The inner door panel has an attachment area, a first edge portion and a second edge portion, with the first edge portion defining hinge attachment locations. The pillar panel is fixedly attached to at least the second edge portion and the attachment area such that the inner door panel and the pillar panel define a hollow B-pillar structure. The pillar panel further includes an offset portion that is spaced apart from a central portion of the attachment area of the inner door panel such that the attachment area and the offset portion define a recessed area therebetween. The first cushioning pad has a main body installed within the recessed area between the offset portion of the pillar panel and the inner door panel.

A vehicle door assembly includes an inner door panel, a pillar panel and a first cushioning pad. The inner door panel has an attachment area, a first edge portion and a second edge portion, with the first edge portion defining hinge attachment locations. The pillar panel is fixedly attached to at least the second edge portion and the attachment area such that the inner door panel and the pillar panel define a hollow B-pillar structure. The pillar panel further includes an offset portion that is spaced apart from a central portion of the attachment area of the inner door panel such that the attachment area and the offset portion define a recessed area therebetween. The first cushioning pad has a main body installed within the recessed area between the offset portion of the pillar panel and the inner door panel.

An impact-resisting beam is provided, the beam comprising a multi-layer composite structure, the composite structure comprising first and second fibrous materials, the first fibrous material having a first effective elastic modulus and comprising one or more layers comprising fibers of a first type being arranged with one or more orientation angles relative to a longitudinal axis of the beam such that a predetermined load applied to the beam from a direction perpendicular to its longitudinal axis drives the fibers of the first type towards alignment with the longitudinal axis of the beam, the second fibrous material having a second effective elastic modulus and comprising one or more layers comprising fibers of a second type, the second fibrous material being selected to provide effective elongation or deformation of the beam which prevents splitting of the beam under application of the predetermined load.

There are provided a vehicle-body frame member forming an opening portion for entrance at a vehicle side part and a front side door provided so as to open and close the opening portion. The vehicle-body frame member comprises a side sill, the front side door comprises a door panel portion provided with an inner lower portion which overlaps with the side sill in a vehicle wide view and reinforcement portions provided at three side-portions of a peripheral part of the door panel portion which are continuous and include the inner lower portion such that the reinforcement portions overlap with the vehicle-body frame member in a vehicle side view.

A door impact beam includes a top plate, a recessed bead, and walls. The top plate faces an outer panel that constitutes a door of the vehicle and extends in the front-rear direction of the vehicle. The recessed bead is disposed on the top plate and has a U shape toward an inner panel that constitutes the door of the vehicle. The walls protrude toward the inner panel from both ends of the top plate in a width direction of the top plate. The door impact beam is formed by press-molding a sheet-metal composite. The sheet-metal composite includes a sheet-metal main body and a reinforcing sheet metal overlapping with a part of the sheet-metal main body in a longitudinal direction. The door impact beam extends in a front-rear direction of the vehicle in an internal space formed by the outer panel and the inner panel.

A vehicle side door for a vehicle includes an inner panel, a door beam, and a bracket. The inner panel includes a wall extending in a direction intersecting a panel main body extending in a front-rear direction of a vehicle body. The door beam extends in the front-rear direction of the vehicle body and is joined to a front portion of the inner panel and a rear portion of the inner panel. The bracket is interposed between the inner panel and the door beam. The bracket includes a beam joint welded in surface contact with an end of the door beam, and a panel joint welded in surface contact with the wall of the inner panel.

A steel composition, a reinforcement part of a vehicle using the steel composition and a method of manufacturing the reinforcement part using the steel composition are provided. In particular, the steel composition includes increased content of carbon components and the steel composition is processed by rapid heating and immediate quenching.

A side frame comprises a center pillar which includes a reinforcement provided on an outward side in a vehicle width direction and an inner panel provided on an inward side in the vehicle width direction. The reinforcement comprises upper-and-lower hinge attachment sections for attaching rear-door hinges and first-and-second recessed beads for promoting bending of the center pillar in a vehicle side collision. The hinge attachment sections are provided to be spaced apart from each other in a vertical direction. The first recessed bead is provided at a higher level than the lower hinge attachment section. The second recessed bead is provided at a lower level than the lower hinge attachment section and configured to be bent before the first recessed bead in the vehicle side collision.

A vehicle door beam and related methods of making door beams include a flat-rolled aluminum alloy sheet, where two edges of the sheet that are transverse to the roll direction of the sheet are brought together to form a tube. The two edges are friction stir welded together to form a butt joint along a length of the tube. The tube is arranged, along with other optional components, as a side-impact door beam in a vehicle door, such that the butt joint is facing away from an expected impact direction of the vehicle door.