COMPOSITE MOTOR VEHICLE BUMPER BEAM.

摘要

A structural reaction injection molded motor vehicle bumper beam comprises a preform (22) formed of layers of interlaced glass fibers (26) and chopped glass fibers (28) wherein most of the interlaced fibers are oriented longitudinally of the bumper beam. A two-component, non-filled reaction injection molding polymeric/pure polyurethane based resin with a neat elongation in excess of about 50 percent bonds the fiberglass layers (26, 28) together in a composite bumper beam structure wherein the fiberglass provides substantial strength and stiffness and the highly compliant resin allows extensive beam deflection without catastrophic cracking to enable the bumper beam without other assistance to absorb sufficient energy in repeated impacts to meet in-service requirements.