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Springback evaluation of friction stir welded TWB automotive sheets

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Abstract

Springback behavior of automotive friction stir welded TWB (tailor welded blank) sheets was experimentally investigated and the springback prediction capability of the constitutive law was numerically validated. Four automotive sheets, aluminum alloy 6111-T4, 5083-H18, 5083-O and dual-phase DP590 steel sheets, each having one or two different thicknesses, were considered. To represent mechanical properties, the modified Chaboche type combined isotropic-kinematic hardening law was utilized along with the non-quadratic orthogonal anisotropic yield function, Yld2000-2d, while the anisotropy of the weld zone was ignored for simplicity. For numerical simulations, mechanical properties previously characterized [1] were applied. For validation purposes, three springback tests including the unconstrained cylindrical bending, 2-D draw bending and OSU draw-bend tests were carried out. The numerical method performed reasonably well in analyzing all verification tests and it was confirmed that the springback of TWB as well as of base samples is significantly affected by the ratio of the yield stress with respect to Young’s modulus and thickness.

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Authors and Affiliations

  1. Advanced Mechanical R&D Group, Mobile Communication Division, Telecommunication Network Business, Samsung Electronics Co., LTD., Suwon-si, Gyeonggi, 443-742, Korea

    Junehyung Kim

  2. Composite Materials Research Group, Korea Institute of Materials Science, 531 Changwon-daero, Changwon, Gyeongnam, 641-010, Korea

    Wonoh Lee

  3. Automotive Steel Applications Research Group, Technical Research Labs., POSCO, Gwangyang-si, Jeonnam, 545-090, Korea

    Kyung-Hwan Chung

  4. Materials Deformation Research Group, Korea Institute of Materials Science, Gyeongnam, 641-010, Korea

    Daeyong Kim

  5. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang-si, Gyeongbuk, 790-784, Korea

    Chongmin Kim

  6. Research & Development Division, Hitachi America, Ltd., 34500 Grand River Ave., Farmington Hills, MI, 48335, USA

    Kazutaka Okamoto

  7. Department of Materials Science & Engineering, Ohio State University, 2041 College Road, Columbus, OH, 43210, USA

    R. H. Wagoner

  8. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 151-742, Korea

    Kwansoo Chung

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  1. Junehyung Kim
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  2. Wonoh Lee
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  3. Kyung-Hwan Chung
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  4. Daeyong Kim
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  5. Chongmin Kim
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  6. Kazutaka Okamoto
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  7. R. H. Wagoner
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  8. Kwansoo Chung
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Correspondence to Kwansoo Chung.

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Kim, J., Lee, W., Chung, KH. et al. Springback evaluation of friction stir welded TWB automotive sheets. Met. Mater. Int. 17, 83–98 (2011). https://doi.org/10.1007/s12540-011-0212-2

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  • DOI: https://doi.org/10.1007/s12540-011-0212-2

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