Transactions of Materials and Heat Treatment

Title：Springback analysis on sizing process of longitudinal floor beam for super high strength steel based on Yoshida_Uemori material model

Authors： Liu Zhenwei Guo Yun

Unit： Baoshan Iron & Steel Co. Ltd.

KeyWords： springback super high strength steel longitudinal floor beam Yoshida_Uemori material model finite element simulation

ClassificationCode：TG386.3

year,vol(issue):pagenumber：2018,43(10):62-67

Abstract：

The related parameters of YoshidaUemori material model for QP980 super high strength steel part were measured by tests, and taking this as the foundation of followup research. Then the data analyses of simulation process and actual production process were completed for longitudinal floor beam. By comparing the springback distribution, the springback calculation accuracy of the material model applying the hardening curve of Yoshida_Uemori in the actual production process was verified, and the causes of this type of springback characteristic were analyzed based on the simulation data. Finally, it is found that the direction similarity of major strain at the central side wall is good and mainly in the direction parallel to the flange for longitudinal floor beam part with bosses at flange locations, and the principal strains at the top and bottom reach about 0.52 and 0.3 respectively which are easy to release by the springback parallel to the flange. However, the principal strain near two ends is up to 0.4, and the direction similarity is worse, thus, the tendency to release through deformation is small. So above all of these cause the angle springback at the central side wall to be 1.5-2.5 times that near two ends.

Funds：

国家重点研发计划（2017YFB0304403）

刘贞伟（1982-），男，硕士，工程师，E-mail：liuzhenwei0720@163.com

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