A vehicle door structure includes: a door inner including a body wall portion, a first opposed wall portion, and a second opposed wall portion; a door outer panel; an impact beam; an impact beam extension including a door-inner-side end portion and a fixed end; and a first reinforcement including a support portion fixed to the first opposed wall portion and a free end portion extending from the support portion toward the impact beam, wherein the impact beam extension and the free end portion are configured to be fitted to each other.

A door beam includes an aluminum alloy extrusion body extended in a longitudinal direction and having a pair of webs and a pair of flanges to be positioned on an inner side and an outer side in a width direction of a vehicle body. The pair of webs connect the pair of flanges at joint portions of each of the pair of webs such that the pair of webs and the pair of flanges form a closed cross section in a direction perpendicular to the longitudinal direction, and the pair of webs do not have a welded portion.

A panel door applied for a vehicle including a stiffness member made of a plastic material and integrally formed on an internal surface of the panel door, includes an external panel, an internal panel coupled to the external panel, and a stiffness member formed to connect a frame forming a circumference and stiffness elements provided for reinforcing stiffness inside the frame and coupled to at least one of the external panel and the internal panel.

A steel sheet member combination structure includes: a first steel sheet member having a main wall portion, a standing wall portion that stands from an end edge of the main wall portion, and a flange portion that extends parallel to the main wall portion from an end edge of the standing wall portion; and a second steel sheet member having a horizontal wall portion that is joined to at least one of an inner surface or an outer surface of the first steel sheet member and that abuts the main wall portion and a side wall portion that abuts the standing wall portion, and the first steel sheet member and the second steel sheet member satisfy predetermined relational expressions.

Present disclosure discloses a reinforcement member (10) for a vehicle. The member includes a first component (1) made of steel and a second component (2) secured to a portion of the first component. The second component is made of a reinforced polymer. The reinforcement member with the combination of the second component and the first component is configured to absorb impact energy. The reinforcement member (10) of the present disclosure is lighter in weight unlike the conventional reinforcement members and is structured to absorb/attenuate significantly impact higher energy than the conventional beams.

Method for producing a reinforcement beam for a vehicle, comprising at least one weak zone arranged in such a way that the bending resistance of the beam is less in said weak zone than in the rest of the beam, characterized in that it comprises, in order, a step (A) of extruding a profile part, a step (B) of cutting the profile part so as to obtain at least one profile segment, a step (C) of locally deforming the segment of the profile part in order to create the weak zone or zones.

A door beam including an aluminum alloy extrusion extended in a longitudinal direction and having a pair of webs and a pair of flanges to be positioned on an inside and an outside in a vehicle width direction. The pair of webs connect the pair of flanges at joint portions of each of the pair of webs such that the pair of webs and the pair of flanges form a closed cross section in a direction perpendicular to the longitudinal direction, and each of the pair of webs has a welded portion in a vicinity of a neutral axis passing through a centroid of the closed cross section and parallel to the pair of flanges.

A metal pipe has a circular cross section with an outer diameter D and a length not less than 6D. The metal pipe includes a high-strength portion (1A) and low-strength portions (1B). The high-strength portion (1A) is disposed along the entire circumference of the metal pipe to extend a dimension, as measured in the longitudinal direction of the metal pipe, that is not less than ()D and not more than 3D of the metal pipe. The high-strength portion (1A) has a yield strength not less than 500 MPa (or a tensile strength not less than 980 MPa). The low-strength portions (1B) are disposed along the entire circumference of the metal pipe to be arranged in the longitudinal direction of the metal pipe to sandwich the high-strength portion (1A). The low-strength portions (1B) have a yield strength of 60 to 85% of that of the high-strength portion (1A).

A main body (2) has door attaching portions respectively formed on both end sides of a long longitudinal direction thereof and a bending deformation generation portion (3) disposed between the door attaching portions, and the bending deformation generation portion (3) has a groove bottom portion (4), two edge line portions (5a, 5b), two vertical wall portions (6a, 6b), two curved portions (7a, 7b), and two flanges (8a, 8b). There is provided a bead (13) which is formed toward the longitudinal direction of the main body (2) in a part of the groove bottom portion (4) in a manner to project in a shape having a curved surface toward the outside of a cross-sectional shape of the bending deformation generation portion (3) so as to oppose an impact load acting on a door impact beam (1).

A door impact beam that is disposed across a door frame of a vehicle and a method of manufacturing the door impact beam may include a body formed in a pipe shape and concaved on a side facing an external side of the vehicle; and coupling portions integrally extending from first and second end portions of the body to be coupled to the door frame through spot welding.