Theoretical predictions of fracture and springback for high tensile strength steel sheets under stretch bending

Takeshi Uemori, Tetsuo Naka, Naoya Tada, Hidenori Yoshimura, Takashi Katahira, Fusahito Yoshida

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)


For the last two decades, strong demands for the light weighted structures of automobiles have been increasing in all over the world. In order to satisfy the demands, the high strength steel sheets (hereafter HSSs) have been widely utilized in the various automobile related companies. However, for the companies, it is still one of the hard tasks to apply HSSs for the automobile parts with complex shapes, due to low ductility and large springback of the HSSs. In the present research, we assumed fracture limits in stretch bending are theoretically obtained with the assumption that fracture occurs when stretching force reaches its maximum value. The authors proposed an explicitly theoretical analysis method based on the maximum load criterion that can easily and rapidly allow us to predict the fracture and springback of HSSs by using two no dimensional parameters (limited wall stretch L/L0 (L: limit wall length of a sheet, L0: initial wall length) and bending radius t/R (t: sheet thickness, R: bending radius)). For the evaluations of this method, the comparisons between stretching bending experiments of HSSs and the corresponding theoretical calculations were conducted. From the comparisons, the calculated results by our proposed method have good agreements with the experimental observations.

Original languageEnglish
Pages (from-to)1594-1598
Number of pages5
JournalProcedia Engineering
Publication statusPublished - 2017
EventInternational Conference on the Technology of Plasticity, ICTP 2017 - Hucisko, United Kingdom
Duration: Sept 17 2017Sept 22 2017


  • Fracture
  • High tensile strength steel sheets
  • Springback
  • Stretch bending

ASJC Scopus subject areas

  • Engineering(all)


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