Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 65, Issue 5
Displaying 1-7 of 7 articles from this issue
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Special issue on “Novel technology of metal forming processes and numerical simulations for light metals”
REVIEW
RESEARCH ARTICLE
  • Evaluation of forming limit by principal shear strain energies
    Hidenori Yoshimura, Hiroya Horita, Takeshi Uemori, Tetsuo Naka, Yutaka ...
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 5 Pages 190-195
    Published: May 30, 2015
    Released on J-STAGE: June 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.190
    JOURNAL FREE ACCESS
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    In sheet metal forming, crack in the formed sheets is one of the serious defects, and it is tried to avoid the crack by use of numerical simulation. In the simulation, period and location of the occurrence should be quantitatively evaluated by the formulated criteria. For prediction of crack occurrence, various ductile fracture criteria have been proposed. These criteria are based on the void damage theory and include effect of void growth and coalescence at the late stage of the fracture. In sheet forming, however, not only crack but also necking is problems, and it is important to obtain forming limit of the uniform deformation. Although the forming limit has been examined by M–K theory etc., the criteria does not reach the sufficient level. We consider that the plastic deformation depend on the shear deformation and the criterion by three principal shear strain energies is proposed. In order to verify applicability of the criterion, flat-die drawing tests of aluminum sheets with proportional and non-proportional strain passes were carried out and the forming limit curves predicted by the proposed criterion comparatively agrees with the test results.
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  • Biaxial tensile deformation simulation of 5000 series aluminum alloy sheet using crystal plasticity finite element method based on homogenization method and its experimental validation
    Keisuke Hashimoto, Akinori Yamanaka, Junpei Kawaguchi, Takeo Sakurai, ...
    Article type: RESEARCH ARTICLE
    2015 Volume 65 Issue 5 Pages 196-203
    Published: May 30, 2015
    Released on J-STAGE: June 30, 2015
    DOIhttps://doi.org/10.2464/jilm.65.196
    JOURNAL FREE ACCESS
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    Biaxial tensile deformation behavior of 5000 series aluminum alloy sheet was simulated by using crystal plasticity finite element method based on the mathematical homogenization method. The representative volume element of crystallographic texture in the alloy was constructed using the crystal orientation data measured by electron back scattered diffraction technique. The material parameters used for the work hardening law were identified on the basis of the true stress-true strain curve measured by the uniaxial tensile test. In order to validate the simulated biaxial tensile deformation behavior of the alloy sheet under linear biaxial stress paths, the calculated true stress-true plastic strain curves and contours of equal plastic work in stress space were precisely compared with those obtained by a servo-controlled biaxial tensile testing machine. Although the anisotropic hardening behavior observed by the experiments was not fully reproduced by the present simulation, the simulated stress–strain curve and the evolution of contours of equal plastic work showed good agreement with the experimental result.
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