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Material Modeling and Forming Limit Analysis of Tubular Materials for Automotive Use Subjected to Biaxial Stresses

Research Project

Project/Area Number 15560622
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionNational University Corporation Tokyo University of Agriculture and Technology

Principal Investigator

KUWABARA Toshihiko  National University Corporation Tokyo University of Agriculture and Technology, Institute of Symbiotic Science and Technology, Professor, 大学院・共生科学技術研究部, 教授 (60195609)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥3,000,000 (Direct Cost: ¥3,000,000)
Keywordstubehydro forming / aluminum alloy / anisotropic yield function / yield surface / forming limit strain / forming limit stress / material testing / yield criterion / 成形限界線 / ひずみ経路 / FLC / FLSC / アルミニウム合金管 / 成形限界
Research Abstract

The anisotropic plastic deformation behavior and forming limits of extruded 5000 series aluminum alloy tubes, A5154-H112, of 76mm outer diameter and 3.9mm wall thickness is investigated, using a servo-controlled tension-internal pressure testing machine. Detailed measurements were made of the initial yield locus, contours of plastic work for different levels of work-hardening, and the directions of the incremental plastic strain vectors for both linear and combined stress paths. It is found that the measured work contours constructed in the principal stress space are similar in shape, and that the directions of the incremental plastic strain vectors remain almost constant at constant stress ratios. The work-hardening behavior predicted using Hosford's or the Yld2000-2d yield functions under the assumption of isotropic hardening agrees closely with the observations for both linear and combined stress paths. The material is thus found to work-harden almost isotropically. Both yield functions are effective phenomenological plasticity models for predicting the anisotropic plastic deformation behavior of the material. Forming limit curves are plotted in strain space, as well as in stress space. The former gives a conventional Forming Limit Curve(FLC) whereas the latter gives a Forming Limit Stress Curve(FLSC). It is found that FLCs depend significantly on the strain/stress paths, but the stress states at the forming limit lie close to a single curve in the principal stress space for a variety of stress paths ; the path-dependence of the FLC vanishes when viewed in stress space. We have confirmed that this effect is not a result of the saturation tendency of the stress-strain curves of the present material at high strain levels. The FLSC concept is therefore valuable for predicting the failure of metal tubes and sheets in plane stress states, particularly in multistage forming.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (16 results)

All 2005 2004 Other

All Journal Article (10 results) Book (2 results) Publications (4 results)

  • [Journal Article] Anisotropic plastic deformation of extruded aluminum alloy tube under axial forces and internal pressure2005

    • Author(s)
      T.Kuwabara
    • Journal Title

      International Journal of Plasticity 21・1

      Pages: 101-117

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Anisotropic plastic deformation of extruded aluminum alloy tube under axial forces and internal pressure2005

    • Author(s)
      Toshihiko Kuwabara
    • Journal Title

      International Journal of Plasticity 21

      Pages: 101-117

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 応力を基準としたアルミニウム合金管の成形限界2004

    • Author(s)
      吉田健吾
    • Journal Title

      塑性と加工 45・517

      Pages: 123-128

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Stress-Based Forming Limit Criterion for Aluminum Alloy Tube2004

    • Author(s)
      Kengo Yoshida
    • Journal Title

      Journal of Japan Society for Technology of Plasticity 45

      Pages: 123-128

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 成形限界応力のひずみ経路依存性

    • Author(s)
      吉田健吾
    • Journal Title

      塑性と加工 (掲載予定)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Experimental verification of the path-independence of forming limit stresses

    • Author(s)
      K.Yoshida
    • Journal Title

      International Journal of Forming Processes (掲載予定)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Strain Path Dependency of Forming Limit Stresses

    • Author(s)
      Kengo Yoshida
    • Journal Title

      Journal of Japan Society for Technology of Plasticity (to be published)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Experimental verification of the path-independence of Forming limit stresses

    • Author(s)
      Kengo Yoshida
    • Journal Title

      International Journal of Forming Processes (to be published)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 成形限界応力のひずみ経路依存性

    • Author(s)
      吉田健吾
    • Journal Title

      塑性と加工 (掲載決定)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Experimental verification of the path-independence of forming limit stresses

    • Author(s)
      K.Yoshida
    • Journal Title

      International Journal of Forming Processes (掲載決定)

    • Related Report
      2004 Annual Research Report
  • [Book] 静的陽解法FEM(加工プロセスシミュレーションシリーズ1)2004

    • Author(s)
      日本塑性加工学会編
    • Total Pages
      288
    • Publisher
      コロナ社
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Book] Japan Society for Technology of Plasticity, Static Explicite FEM2004

    • Total Pages
      288
    • Publisher
      Korona-sha
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] T.Kuwabara, K.Yoshida, K.Narihara, S.Takahashi: "Anisotropic Plastic Deformation of Extruded Aluminum Alloy Tube under Axial Forces and Internal Pressure"International Journal of Plasticity. (accepted).

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Yoshida, T.Kuwabara, S.Takahashi: "Experimental study of the forming limits for A5154-H112 extruded tubes having various biaxial stress paths"Proc.ESAFORM '04. (ノルウェーにて発表予定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 吉田健吾, 桑原利彦: "チューブハイドロフォーミングにおける複合変形経路下での成形限界の解析"平成16年度塑性加工春季講演会講演論文集. (発行予定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 共著: "日本塑性加工学会編:静的陽解法FEM,第8章 異方性降伏関数"コロナ社(5月発刊予定). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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