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2003 Fiscal Year Final Research Report Summary

Research on Analysis of Tube Hydroforming with High Accuracy by Meshfree Method

Research Project

Project/Area Number 14550086
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionKeio University

Principal Investigator

NOGUCHI Hirohisa  Keio University, Faculty of Science and Engineering, Professor, 理工学部, 教授 (70218303)

Co-Investigator(Kenkyū-buntansha) KURODA Mitsutoshi  Yamagata University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (70221950)
Project Period (FY) 2002 – 2003
KeywordsTube Hydroforming / Meshfree Method / Plastic Instability / Nonlinear Analysis
Research Abstract

The conclusions of this research is summarized as follows.
(1) As a high accurate analysis method for tube hydroforming, the existing meshfree technique is applied to the finite element method. As results, a novel assumed strain type finite element method is proposed considering geometrical nonlinearity, in which deformation gradient is assumed to be constant and averaged within an element. For further improvement of the accuracy, the moving least-square method is adopted as the approximation of displacement field. This method uses the same nodal arrangement as in the finite element method and an element is also used as an integration domain. Therefore, any kinds of mesh generation techniques are available. The accuracy of the method is verified by illustrated numerical analyses of linear and nonlinear problem.
(2) For practical evaluation of tube hydroforming, a finite element analysis of thin-walled tube which is simultaneously subjected to axial load and internal pressure is conducted … More . As for constitutive law, visco-plastic model is adopted. Axial load and internal pressure have to be independently controlled so that the ratio of longitudinal and circumferential stresses could be kept constant. To enable this, a novel arc-length method with two different loading modes is proposed. In the method, the ratio between longitudinal and circumferential stresses is controlled as an additional constraint condition. Plastic instability condition of thin-walled tube under combined loading is also presented. A numerical example demonstrates that the proposed method can keep the stress ratio constant through the analysis and evaluate the maximum loading points of thin-walled tube under combined loading.
(3) For accurate estimation of material behavior for tube hydroforming, the hydrostatic stress-sensitivity effect, which has been observed in several previous experimental studies, is incorporated into a recently proposed phenomenological plasticity model with vertex-type of effect. This plasticity model is implemented into an finite element method. To test the model, shear band developments predicted by the present model are directly compared to predictions by a crystal plasticity model with hydrostatic stress-dependence of crystallographic slip behavior. It is shown that the present phenomenological model has a sufficient ability to reproduce the crystal plasticity predictions. Furthermore, an effect of the hydrostatic stress-dependence of yielding on forming limits of thin metal sheets is investigated by use of a Marciniak, VKuczynski-type approach. Less

  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Tadano, Y., Noguchi, H., Kuroda M.: "An Analysis of Thin-walled Tube under Combined Loading using Different Yield Criteria"Proceedings of Plasticity '03 : The Tenth International. 561-563 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 只野裕一, 野口裕久, 黒田充紀: "複合荷重を受ける薄肉金属管の成形限界解析"M&M2003材料力学部門講演会講演論文集. No.03-11. 1089-1090 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 只野裕一, 野口裕久, 黒田充紀: "2軸応力制御による薄肉管の大変形弾塑性解析"JSME第16回計算力学講演会講演論文集. No.03-26. 567-570 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中原和洋, 野口裕久: "移動最小自乗法を用いたひずみ仮定型有限要素法"JSME第16回計算力学講演会講演論文集. No.03-26. 925-926 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kuroda, M.: "A phenomenological plasticity model accounting for hydrostatic stress-sensitivity and vertex-type of effect."Mechanics of Materials. 36. 285-297 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tadano, Y., Noguchi, H., Kuroda M.: "An Analysis of Thin-walled Tube under Combined Loading using Different Yield Criteria"Proceedings of Plasticity '03 : The Tenth International Symposium on Plasticity and its Current Applications. 561-563 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kuroda, M.: "A phenomenological plasticity model accounting for hydrostatic stress-sensitivity and vertex-type of effect."Mechanics of Materials. 36. 285-297 (2003)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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