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Minimizing wrinkling formation of GPa-grade steels in multi-stage crash forming process

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Abstract

This paper newly proposes a strategy for constructing the multi-stage forming procedures to minimize the wrinkling formation with GPa-grade steels in the crash forming. Although the optimum design variables were adopted in the conventional crash forming, it is not possible to control the wrinkling formation in severe cases. In the multi-stage crash forming, the safe forming window against the wrinkling formation for the pre-stage forming has been constructed with numerical simulations representing the effects of design variables such as die radius, die angle, step height variations, and flange lengths. It does not only substantially reduce the area fraction of the wrinkling formation, but also recommend the other optimum design variables by interpreting the safe forming window. Experimental validations were carried out by applying the design variables suggested by the safe forming window for the multi-stage forming, which is compared with the conventional crash forming with TRIP1180 steel sheet.

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Funding

Author Prof. Jonghun Yoon has received research funding from the Materials Forming Research Group, POSCO, and “Human Resources Program in Energy Technology” of the Korean Institute of Energy Technology Evaluation and Planning (KETEP), granted by the Ministry of Trade, Industry & Energy, Republic of Korea (no. 20174010201310).

The authors declare that they have no conflicts of interest.

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Authors and Affiliations

  1. Department of Mechanical Design Engineering, Hanyang University, Seoul, 04763, Republic of Korea

    Chanhee Won

  2. Materials Forming Research Group, POSCO Global R&D Center, 00 Songdogwahak-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea

    Dongjin Kim

  3. Department of Mechanical Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan-si, Gyeonggi-do, 15588, Republic of Korea

    Jonghun Yoon

Authors
  1. Chanhee Won
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  2. Dongjin Kim
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  3. Jonghun Yoon
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Correspondence to Jonghun Yoon.

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Won, C., Kim, D. & Yoon, J. Minimizing wrinkling formation of GPa-grade steels in multi-stage crash forming process. Int J Adv Manuf Technol 105, 3325–3335 (2019). https://doi.org/10.1007/s00170-019-04419-1

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  • DOI: https://doi.org/10.1007/s00170-019-04419-1

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