Technical Paper

Functional design of a 'lightweight body in white' - how to determine body in withe materials acording to structural requirements

International Symposium on Niobium Microalloyed Sheet Steel for Automotive Application

Lightweight design and weight reduction of the body-in-white (BIW) cannot always be measured in kilograms, but also has to be related to the achieved vehicle dimension and functional requirements. The functional requirements for stiffness, crash, and car lifetime have to be considered when selecting the materials for a body in white. The stiffness of a structure can be influenced by the E-modulus and panel thickness. Crash and vehicle lifetime demands, which are both driven by the strength of the material, can be affected by high strength steel grades. The following article provides a look at the basic requirements of functional design of a body in white, as well as the development of steel grades applied in several cars over the past few years. In order to benchmark the efforts for lightweight engineering, the specific lightweight coefficient L is developed. The weight saving benefit will be shown, as well as special demands related to manufacturing issues. Finally, structural foams as a lightweight solution to increase stiffness will be addressed. (AU)
Technical Paper (PDF 2,35 MB)