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Research Papers

Investigation on V-Bending and Springback of Laminated Steel Sheets

[+] Author and Article Information
Qiongyao Peng

School of Materials Science and Engineering,
Shanghai Jiao Tong University,
1954 Huashan Road,
Shanghai 200030, China
e-mail: pengqiongyao@sjtu.edu.cn

Xiongqi Peng

School of Materials Science and Engineering,
Shanghai Jiao Tong University,
1954 Huashan Road,
Shanghai 200030, China
e-mail: xqpeng@sjtu.edu.cn

Yinjun Wang

Technology Centre,
Shanghai Meishan Iron & Steel Co., Ltd.,
Jiangning,
Nanjing 210039, China
e-mail: wangyinjun@baosteel.com

Tao Wang

China Resources Power Hunan Co., Ltd.,
Suxian,
Chenzhou 423042, China
e-mail: wangtao89@yeah.net

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received February 26, 2014; final manuscript received January 15, 2015; published online July 8, 2015. Assoc. Editor: Brad L. Kinsey.

J. Manuf. Sci. Eng 137(4), 041002 (Aug 01, 2015) (8 pages) Paper No: MANU-14-1077; doi: 10.1115/1.4029651 History: Received February 26, 2014; Revised January 15, 2015; Online July 08, 2015

Laminated steel sheet (LSS) is a novel functional material consisting of two steel sheets sandwiched by an adhesive layer. It has good vibration damping and noise absorption attributed by the middle polymer layer, and structural function owed to the two face steel sheets. Springback is an omnipresent negative phenomenon in metal sheet bending. Experiments and simulations were conducted to analyze the effects of processing and material parameters on springback of a specified LSS for the purpose of process optimization. Various tests including lap-shear, normal tensile, and viscosity analysis were carried out to obtain the mechanical behavior of the polymer layer. A neo-Hookean hyperelastic model was accordingly developed. Tensile tests of the two skin sheets were also implemented for material model. Ninety degree V-bending experiments were fulfilled as a validation on the feasibility and efficiency of finite element method and material models. A following parametric study on 88 deg V-bending of the LSS was then implemented to provide a processing optimization for industry practice.

Copyright © 2015 by ASME
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References

Figures

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Fig. 1

Three-layer structure of the LSS

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Fig. 2

Nominal stress–nominal strain curves of the surface steel sheet in tensile test

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Fig. 3

Dimensions of the lap-shear test sample (mm)

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Fig. 4

Nominal shear stress–nominal strain curves of lap-shear test

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Fig. 5

Fixture used to make samples for normal bonding property test and the corresponding samples (mm)

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Fig. 6

Nominal stress–nominal strain curves of normal tensile test

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Fig. 7

Geometry of experimental setup and aspects of bend specimens

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Fig. 8

Variation of bend angles after springback with time under different punch strokes

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Fig. 9

Bend angles after springback versus punch force

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Fig. 10

Dimensions of punch, die, and LSS blank (mm)

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Fig. 11

Schematic of the four indices

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Fig. 12

Effects of processing and material parameters on bend angle after springback

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Fig. 13

Effects of processing and material parameters on distance-1

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Fig. 14

Effects of processing and material parameters on distance-2

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Fig. 15

Effects of processing and material parameters on distance-3

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