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Deformation Characteristics and Press-Formability of Steel/Aluminium Clad Sheet Metals

Research Project

Project/Area Number 04650088
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 材料力学
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

YOSHIDA Fusahito  Hiroshima Univ., Faculty of Eng., Associate professor, 工学部, 助教授 (50016797)

Co-Investigator(Kenkyū-buntansha) OKADA Tatsuo  Hiroshima Univ., Faculty of Eng., Research associate, 工学部, 助手 (00233338)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1992: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsStainless-Steel Clad Aluminium Sheet Metals / Press-Formability / Forming Limit / Localized Necking / Stretch Bending / Unbending / Sheet-Thickness Change / Delamination / 引張り曲げ・曲げもどし / 鋼 / アルミニウム系クラッド板 / 引張り試験 / 張出し試験 / 引張り曲げ / 曲げもどし / くびれ発生条件 / 成形限界線図 / スプリングバック
Research Abstract

Deformation characteristics and press-formability in biaxial stretching and stretch bending/unbending were investigated for warn-roll-bounded (at 400゚C) two-ply (SUS430/A1) and three-ply (SUS430/A1/SUS304) clad sheet metals. Delamination during stretch bending/unbending was also discussed for cold-roll-bonded SUS304/A1 clad sheet metals. The results are summarized as follows.
(1) The forming limit diagrams (FLD) for the clad sheet metals and their components (SUS304, SUS430 and A1) were experimentally determined. The clad sheet metals of SUS430/A1 and SUS430/A1/SUS304 have higher formability compared with the warn-rolled SUS430 sheet.
(2) The forming limit in the positive strain ratio for clad sheet metals has been derived based on Hill's localized necking concept. The predicted FLD by the theory agrees comparativery well with the experimental one.
(3) The forming limit in the negative strain ratio for clad sheet metals can be explained by a model of the progress of sheet-thickness imperfection with consideration of void growth (modified M-K theory + void growth).
(4) The sheet-thickness change during stretch bending/unbending around a die corner was examined both experimentally and theoretically for the clad sheet metals. The effects of laminate geometry (clad ratio), a die radius and stretching force on the sheet-thickness change have been clarified.
(5) Delamination during stretch bending/unbending around a die corner was investigated for a cold-roll-boned SUS430/A1 sheet. Delamination likely occurs when a die radius is smaller and the stretching force is larger. It was found from the numerical simulation of the stretch bending/unbending that the delamination is strongly affected by the normal and shear stresses acting on the laminate boundary of a clad sheet during unbending process.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 日野隆太郎,吉田総仁,岡田達夫: "ステンレス/アルミニウム積層板の二軸成形限界" 塑性加工春季講演会論文集(平成5年度). I. 277-280 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 日野隆太郎,吉田総仁,岡田達夫: "ステンレス/アルミニウム積層板の二軸応力下の破壊条件" 日本機械学会第71期全国大会講演論文集. B. 293-295 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] F.Yoshida,R.Hino and T.Okada: "Stretch bending and the subsequent straightening of sheet metal laminates" Advances in Engineering Plasticity and Its Applications. 1097-1104 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 日野隆太郎,吉田総仁: "ステンレス/アルミニウム積層板の成形限界" 塑性加工春季講演会論文集(平成6年度). (予定). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ryutaro HINO, Fusahito YOSHIDA and Tatsuo OKADA: "Biaxial Forming Limit for Stainless/Aluminium Laminates." Proceedings of '93-Spring Meeting of JSTP. Vol.1. 227-280 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ryutaro HINO, Fusahito YOSHIDA and Tatsuo OKADA: "Fracture of Stainless/Aluminium Sheet Laminates under Biaxial Stress Condition." Proceedings of 71st JSME Meeting. Vol.B. 293-295 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] F.YOSHIDA, R.HINO and T.OKADA: "Stretch Bending and the Subsequent Straightening of Sheet Metal Laminates." Advances in Engineering Plasticity and Its Applications. 1097-1104 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Ryutaro HINO and Fusahito YOSHIDA: "Forming Limit for Stainless/Aluminium Laminates." Proceedings of '94-Spring Meeting of JSTP. (to be published). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 日野隆太郎: "ステンレス/アルミニウム積層板の二軸成形限界" 日本塑性加工学会春季講演会論文集(平成5年度). I. 277-280 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 日野隆太郎: "ステンレス/アルミニウム積層板の二軸応力下の破壊条件" 日本機械学会第71期全国大会講演論文集. B. 293-295 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] F.Yoshida: "STRETCH BENDING AND THE SUBSEQUENT STRAIGHTENING OF SHEET METAL LAMINATES" Advances in Engineering Plasticity and its Applications. 1097-1104 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 日野隆太郎: "ステンレス/アルミニウム積層板の成形限界" 日本塑性加工学会春季講演会論文集(平成6年度). (予定). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Fusahito YOSHIDA Ryutaro HINO Tatsuo OKADA: "Stretch Bending and the Subsequent Straightening of Sheet Metal Laminates" Proc.Asia-Pacific Symp.Advances in Engineering Plasticity and Its Applications. (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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