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TECHNICAL PAPERS

Analysis of Tube Hydroforming by Means of an Inverse Approach

[+] Author and Article Information
Ba Nghiep Nguyen, Kenneth I. Johnson, Mohammad A. Khaleel

Computational Mechanics and Material Behavior Group, Pacific Northwest National Laboratory, Richland, WA 99352

J. Manuf. Sci. Eng 125(2), 369-377 (Apr 15, 2003) (9 pages) doi:10.1115/1.1559166 History: Received September 01, 2001; Revised November 01, 2002; Online April 15, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic description of tube free hydroforming
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Flow chart for the computational procedure using the one-step inverse approach.
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Forming limit diagram for the AA6061-T4 seamless tube population based on the experimental data from Ref. 12
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Triangular finite element mesh and deformed configurations at (a) s1=s2=6.4 mm and (b) s1=s2=7.72 mm for a quarter of the tube
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Equivalent plastic strains along a longitudinal arc length measured from a tube end to a middle section point for the deformed configuration given in Fig. 4(a)
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Thickness distributions along a longitudinal arc length measured from a tube end to a middle section point for the deformed configuration given in Fig. 4(a)
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Equivalent plastic strains along a longitudinal arc length measured from a tube end to a middle section point for the deformed configuration given in Fig. 4(b)
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Equivalent stresses along a longitudinal arc length measured from a tube end to a middle section point for the deformed configuration given in Fig. 4(b)
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Thickness distributions along a longitudinal arc length measured from a tube end to a middle section point for the deformed configuration given in Fig. 4(b)
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Internal pressure computed by the inverse analysis starting from the deformed configuration given in Fig. 4(b)
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Prediction of necking for the deformation configuration given in Fig. 4(b) (1: failed, <1: safe)
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Axial (minor) strains along a longitudinal arc length measured from a tube end to a middle section point for the deformed configuration given in Fig. 4(b)
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Circumferential (major) strains along a longitudinal arc length measured from a tube end to a middle section point for the deformed configuration given in Fig. 4(b)
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Loading history prescribed in the incremental analysis with s1≠s2
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Initial and deformed configuration at s1=10 mm and s2=27.2 mm
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Equivalent plastic strains along a longitudinal arc length measured from one tube end to another for the deformed configuration given in Fig. 15
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Equivalent stresses along a longitudinal arc length measured from one tube end to another for the deformed configuration given in Fig. 15
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Thickness distributions along a longitudinal arc length measured from one tube end to another for the deformed configuration given in Fig. 15
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Internal pressure computed by the inverse analysis for the deformed configuration given in Fig. 15
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Prediction of necking for the deformation state given in Fig. 15 (1: failed, <1: safe)
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Axial (minor) strains along a longitudinal arc length measured from one tube end to another for the deformed configuration given in Fig. 15
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Circumferential (major) strains along a longitudinal arc length measured from one tube end to another for the deformed configuration given in Fig 15

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