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Research Papers

Nonlinear Finite Element Analysis of Spring-Back Characteristics in the Cold-Forming Process of Three-Dimensionally Curved Thick Metal Plates

[+] Author and Article Information
Jeom Kee Paik

e-mail: jeompaik@pusan.ac.kr

Chang Hyo Tak

The Lloyd's Register Educational
Trust Research Centre of Excellence,
Pusan National University,
30 Jangjeon-Dong, Geumjeong-Gu,
Busan 609-735, Korea

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received July 1, 2010; final manuscript received September 18, 2011; published online May 27, 2013. Assoc. Editor: Xin Sun.

J. Offshore Mech. Arct. Eng 135(3), 031001 (May 27, 2013) (6 pages) Paper No: OMAE-10-1069; doi: 10.1115/1.4023790 History: Received July 01, 2010; Revised September 18, 2011

The present paper is part of the study to develop the advanced computer aided manufacture (CAM) system called the changeable die system (CDS) that applies the cold-forming technique to produce curved thick metal plates with complex, three-dimensional geometry [Paik et al., 2009, “Development of the Changeable Die System for the Cold-Forming of Three-Dimensionally Curved Metal Plates,” The Lloyd's Register Educational Trust Research Centre of Excellence, Pusan National University, Korea]. This paper focuses on the procedure of predicting the spring-back characteristics using elastic-plastic large deflection finite element method, which is a key technical element within the framework of the CDS process. The validity of the procedure is confirmed by comparison with experimental results obtained by the CDS machine in the cold-forming process of curved steel plates.

Copyright © 2013 by ASME
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References

Figures

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Fig. 7

Stress versus strain curves of the material obtained in the tensile test at varying thickness of plates

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Fig. 8

Configurations of the target surfaces with varying the thicknesses of the curved plates

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Fig. 9

Modeling of computer model

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Fig. 6

Spring-back behavior in the cold-forming process of the curved metal plate [1]

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Fig. 5

Algorithm of the CDS

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Fig. 4

A sample target surface of the curved plate

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Fig. 3

Spring-back effect in the cold-forming process

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Fig. 2

Photos of the changeable die system [1]

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Fig. 1

Photo of the line heating method application for forming curved steel plates in shipyard

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Fig. 10

The spring-back behavior of the plate with the thickness of 9 mm, obtained by nonlinear FEA

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Fig. 11

The spring-back behavior of the plate with the thickness of 12 mm, obtained by nonlinear FEA

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Fig. 12

The spring-back behavior of the plate with the thickness of 15 mm, obtained by nonlinear FEA

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Fig. 13

The error definition between the actual target surface and the predicted surface

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Fig. 14

Plate surface configurations predicted by the algorithm and obtained by the experiment (press machine), for the thickness of 9 mm

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Fig. 15

Plate surface configurations predicted by the algorithm and obtained by the experiment (press machine), for the thickness of 12 mm

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Fig. 16

Plate surface configurations predicted by the algorithm and obtained by the experiment (press machine), for the thickness of 15 mm

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