A Study on the Formability of Sheet Steel

• FUKUI Yasuyoshi

• NAKANISHI Kenji

抄録

The formability of two sheet steels, SSPDX (0.8mm thickness) and SPMY (0.9 mm thickness), are examined by means of a plane-strain tensile test and an in-plane stretching test. The parameter m of Hill's nonpolynomial yield function is calculated by applying Wagoner's method. The assumption m=2 is recognized for both steels because the difference between effective stress-strain curves of the uniaxial and plane-strain test can almost be neglected. The experimental data of the in-plane stretching test are in good agreement with those predicted by modified M-K theory. Because of less roughness, i.e., a slower growth rate, the limit strain for SSPDX is greater than that for SPMY. The fracture mechanism of the in-plane stretching specimen observed is almost identical to those for isotropic fcc metals reported. However, that of the plane-strain tensile specimen is quite different. The crack is initiated at the center of the specimen by shear deformation and then propagated in the manner of a mode I-type crack. This difference is well explained in terms of anisotropy and strain distribution.

収録刊行物

• JSME international journal. Ser. 1, Solid mechanics, strength of materials

  JSME international journal. Ser. 1, Solid mechanics, strength of materials 32 (1), 142-148, 1989

  一般社団法人 日本機械学会

キーワード

• Plasticity
• Forming Limit
• Anisotropy
• Shear
• Sheet Steel
• Modified M-K Theory

詳細情報

• CRID: 1390001205433604480
• NII論文ID: 110002348272
• NII書誌ID: AA10680585
• DOI: 10.1299/jsmea1988.32.1_142
• ISSN: 09148809
• Web Site: https://www.jstage.jst.go.jp/article/jsmea1988/32/1/32_1_142/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可