Comparative Study on Some Appropriate Material Models for Automotive Ultra-High Strength Steels Parts Using FE Simulation

Abstract

Presently, in automotive industries have an intensive challenge by increasing environmental regulations and the enhancement of passenger's safety. The use of advanced high strength steels was highly interested in research and industry applications. These materials have special forming properties such as high strength and high elongation value but in forming processes the main problem is the large amount of spring back. It occurs after released the workpiece from the die cavity and makes problem in the assembly process. This paper shows the geometry comparison between the result of reinforcement part's finite element forming simulation using different material models and the actual forming part. The reinforcement part was produced from advanced high strength steel grade DP980. The part's measurements used “Best fit” function to define the displacement deviations between actual part and simulated part. The obtained results shown the using of Yoshida-Uemori (Y-U) material model combined with Barlat 1989 (Yield89) yield criteria have the less of variation value compared with the other models. This result can mentions using of Y-U model combined with Yield89 is suitable for reinforcement part's and the other similar shape parts die simulation.