The Investigation on the Energy Absorption Performance of Hot Stamping Tailor-Welded Blanks (TWBs) via the Hat-Shaped Three Point Bending Test

摘要

Hot stamping technology has become an unavoidable approach to achieve the automotive body structure lightweight design. The application of tailor welded blanks (TWBs) on the hot stamped parts has become more common for some safety concerned parts such as B-pillar in order to meet the required energy absorption characteristic. This study investigates the energy absorption performance of hot stamping single property and TWB hat-shaped samples via the three-point bending test. The results show that the material grade and welding line’s orientation play an important role in the energy absorption performance. For the TWBs the peak reaction force is dominated by the hard zone’s material strength. The simplified CAE model developed in this study is sufficient to predict the energy absorption characteristic for the TWB hot stamping parts design.