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Technical Paper

Effect of Sheet Surface Roughness and Painting Variables on Painted Sheet Appearance

The painted appearance of shot-blast-textured (SBT) and electric-discharge-textured (EDT) automotive cold-rolled steel sheets was determined and related empirically to surface roughness parameters, phosphate coating weight, and paint thickness. The results were used to establish the ranges of average roughness and peak count necessary for acceptable painted appearance.
Technical Paper

Evaluation of the Corrosion Durability of Steel Systems for Automobile Fuel Tanks.

The Strategic Alliance for Steel Fuel Tanks (SASFT), an international group of steel producers and manufacturing companies, recently completed a major corrosion study of various steel ‘systems’ for automobile fuel tanks. The ten steel systems included low carbon steels (either pre-painted or post-painted with protective coatings) and stainless steels. The 2-year corrosion test program included testing in salt solutions to simulate road environments for the exterior of a fuel tank. Special test specimens were designed to represent a manufactured tank. The external tests used were the Neutral Salt Spray test (ASTM B117) with exposures up to 2000 hours and the Cyclic Corrosion test (SAE J2334) with exposures up to 120 and 160 cycles to represent vehicle lives of 15 years and 20 years, respectively. Additionally, the resistance to an aggressive ethanol-containing fuel (internal tank corrosion) was assessed by using uniquely designed drawn cups of the various steel systems.
Technical Paper

Material Modeling Effects on Impact Deformation of Ultralight Steel Auto Body

This paper describes the results of the computational analysis of UltraLight Steel Auto Body (ULSAB) crash simulations that were performed using advanced material modeling techniques. The effects of strain-rate sensitivity on a high strength steel intensive vehicle was analyzed. Frontal and frontal offset crash scenarios were used in a finite element parametric study of the ULSAB body structure. Comparisons are made between the crash results using the piece-wise-linear isotropic plasticity strain-rate dependent material model, and the isotropic plasticity material model based on quasi-static properties. The simulation results show the importance of advanced material modeling techniques for vehicle crash simulations due to strain-rate sensitivity and rapid hardening characteristics of advanced high strength steels.
Technical Paper

Metal Forming Characterization and Simulation of Advanced High Strength Steels

The remarkable evolution of steel technology in recent years has resulted in the development of new High Strength Steels (HSS) that are increasingly used in today's automobiles. The advanced performance of these grades in ductility and rapid hardening characteristics provides an opportunity to stamp complex geometries with in-panel material strengths far exceeding those of conventional high strength grades of steel. This provides an opportunity to improve an automotive body's performance in crash, durability and strength while reducing the overall weight of the vehicle. An improved understanding of the forming characteristics of these advanced HSS and accurate prediction of the material processing strain will allow vehicle designers to fully explore the opportunities of increased yield, strain hardening, formability and strength and the potential this creates to reduce mass and improve the performance of the automotive body.