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Tech Briefs
Benchmarked bumpers
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The Bumper Project Group identified and benchmarked 11 advanced bumper systems that it felt proved the continued feasibility of steel bumpers. The benchmarked bumpers include:
- A stamped, microalloy HSS, 350-MPa (50-ksi) yield strength front facebar for the 2000 Ford F150 pickup that provides a sizeable, 560-mm (22-in) depth-of-draw resulting in an aerodynamic styling that can lead to better fuel economy. Depth-of-draw refers to the amount of rounding and wrap-around on a bumper system.
- A roll-formed, front reinforcing beam for the 2000 Ford Crown Victoria and Mercury Grand Marquis that uses a microalloy ultra-HSS with a 830-MPa (120-ksi) yield strength. It features an 80-mm (3-in)-deep section with a large sweep number of 34 despite its non-symmetrical design. Sweep refers to the degree of curvature of the outer bumper face.
- A stamped front facebar for the 2000 T300 Dodge Ram pickup that uses a microalloy HSS, 350-MPa (50-ksi) yield strength configured blank, incorporating 65% of the finished trim line, resulting in less scrap and reduced tooling and material cost.
- A stamped microalloy HSS 350-MPa (50-ksi) yield strength front facebar for the 2000 Chevy GMT 800 truck that features integrated brackets, reducing assembly cost through parts integration.
- A stamped front reinforcing beam for the 1998 Volkswagen Jetta that used an HSS, tailor welded blank (TWB) microalloy steel with an 550-MPa (80-ksi) yield strength in the middle portion of the blank; and a microalloy steel with a 310-MPa (45-ksi) yield strength at the two end portions to provide greater strength at the center of the bumper and improved styling through better formability at the ends of the bumper.
- A roll-formed, dual phase ultra-HSS 970-MPa (140-ksi) tensile strength front reinforcing beam for the 2000 Toyota Avalon that mounts to the rails with minimal bracketry.
- A stamped microalloy HSS 350-MPa (50-ksi) yield strength front facebar for the 2000 Ford Ranger that uses an energy absorbing mounting bracket to reduce mass.
- A roll-formed martensitic ultra-HSS 1300-MPa (190-ksi) tensile strength front reinforcing beam for the 2000 Ford Taurus/Mercury Sable that features a sweep number of 19, despite its closed B-section design. The 1300-MPa (190-ksi) steel is the highest strength automotive steel sheet in production in North America.
- A microalloy ultra-HSS 830-MPa (120-ksi) yield strength rear reinforcing beam for the 2000 Chrysler Voyager with a 0.24-mm (6-in) depth-of-draw.
- A roll-formed dual-phase ultra-HSS 970-MPa (140-ksi) tensile strength front reinforcing beam for the 2000 Toyota Camry with a 35 sweep number, considered a large sweep for a double box section.
- A roll-formed dual-phase ultra-HSS 970-MPa (140-ksi) tensile strength front reinforcing beam for the 2000 Chevrolet Cavalier and the Pontiac Sunfire, with a 50 sweep number, extremely large in a box section.
Jean L. Broge
AEI September 2000
For more information, circle 214 & 215
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