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A lightweight, composite beams for reinforcing a vehicle door is provided. The reinforcing beam comprises a metal tube having a longitudinal cavity which is partially filled with a reinforcing polymeric core which in one aspect includes a thermoset or thermoplastic resin-based material. The core is

A lightweight, composite beams for reinforcing a vehicle door is provided. The reinforcing beam comprises a metal tube having a longitudinal cavity which is partially filled with a reinforcing polymeric core which in one aspect includes a thermoset or thermoplastic resin-based material. The core is friction fit or mechanically held within the metal tube at the mid-span of the tube. The composite beam includes end pieces which are adapted to be mounted to a vehicle door panel in a door cavity by spot-welds or the like. The horizontally mounted beam provides substantially increased resistance to side impacts to the vehicle door in the event of a collision.

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A lightweight, composite reinforcing door beam adapted to be mounted in the cavity of a motor vehicle door which has an outer panel and an inner panel, the door beam providing structural reinforcement in the form of increased side-impact resistance when mounted in the cavity of the vehicle door, the

A lightweight, composite reinforcing door beam adapted to be mounted in the cavity of a motor vehicle door which has an outer panel and an inner panel, the door beam providing structural reinforcement in the form of increased side-impact resistance when mounted in the cavity of the vehicle door, the door beam comprising: a metal tube having a longitudinal axis and having a bore coextensive therewith; a resin-based core disposed in said bore of said metal tube, said bore occupying not more than one-third of the length of said bore; said core being positioned substantially at the mid-span of said metal tube; said core being held in place in said bore of said tube; and first and second mounting means disposed at opposite ends of said body and adapted for mounting the door beam in the cavity of the vehicle door, with the longitudinal axis of the door beam positioned horizontally with respect to the vehicle door, thereby increasing the side-impact resistance of the vehicle door.