| Project/Area Number |
61550094
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械工作
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| Research Institution | Kyoto Institute of Technology |
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Principal Investigator |
YAMAGUCHI Katsuhiko Professor, Kyoto Institute of Technology, 工芸学部, 教授 (90027805)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAKURA Norio Research Associate, Kyoto institute of Technology, 工芸学部, 助手 (40163183)
MORI Ken-ichirou Research Associate, Kyoto institute of Technology, 工芸学部, 助手 (80127167)
FUKUDA Masayosho Professor, Kyoto Institute of Technology, 工芸学部, 教授 (20027741)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1986: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | Cald Sheet Metal / FLD / Anisotropic Yield Function / Work-hardening Characteristics / Balanced Biaxial Stretching / Plane Strain Compression Test / Ironing / エネルギ法による解析 / プレス成形性 / クラッド材のしごき加工 / 平面ひずみ圧縮変形の有限要素法シミュレーション |
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| Research Abstract |
For recent demands to obtain products with light weight, high quality and high aded value, clad sheet metals are increasingly used in the press forming of various parts such as car, furniture and electronic components. Since a clad sheet is generally composed of 2 or 3 layers of different materials, the plastic properties are different from those of a single sheet.
In the present investigation, the effects of the combination of sheet materials and tha clad ratio on the work-hardening characteristics and forming limit of a clad sheet are discussed. First of all, uniaxial tension, uniaxial compression through thickness and plane strain compression tests are carried out to know the plastic properties of each sheet metal composing a clad sheet. The Hill, Gotoh and Bassani anisotropic yield functions are compared with the experimental results.
Secondly, an upper bound analysis of the uniaxial compression of (Al-steel) and (Al-Cu) clad sheets is made based on the stress-strain curves of each material measured above. From this analysis, it has been predicted how the stres-strain curve, yield locus and forming limit of the clad sheet metal change with the clad ratio.
As an additional experiment related to the press forming of clad sheet, ironing of 3-layer (Cu-Al-Cu, Al-Cu-Al) tubes is carried out and the effects of ironing conditions on the thickness strain of each layer are clarified.
Further investigations should be made of the constitutive equation and the factors for estimating formability of clad sheet metals. An analysis taking into consideration the plastic anisotropy of each sheet metal is also necessary to predict the onset of de-lamination which is one of the most important factors affecting the deformation behaviour of the clad sheet metal.
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