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RESEARCH PAPERS

Modeling of Anisotropic Deformation in Superplastic Sheet Metal Stretching

[+] Author and Article Information
Fadi K. Abu-Farha, Marwan K. Khraisheh

Center for Manufacturing and Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506

J. Eng. Mater. Technol 127(1), 159-164 (Feb 22, 2005) (6 pages) doi:10.1115/1.1839216 History: Received March 23, 2004; Revised July 15, 2004; Online February 22, 2005
Copyright © 2005 by ASME
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References

Figures

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Stress–strain state under biaxial loading
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σ11 at ε̇1=10−3 s−1 for different values of k
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σ22 at ε̇1=10−3 s−1 for different values of k
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Anisotropic yield surfaces at different values of ϕ0, compared to von Mises
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Evolution of the anisotropic angle ϕ at k=−0.5 for different values of ε̇1
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Schematic representation of free blow forming of a circular sheet
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The effect of anisotropy and grain-growth on the pressure–time profiles at ε̇e=2×10−3 s−1 for the case of strain-balanced biaxial stretching
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The effect of anisotropy and grain-growth on the pressure–time profile at ε̇e=2×10−3 s−1 for the case of stress-balanced biaxial stretching
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The effect of anisotropy and grain-growth on the pressure–time profile at ε̇e=2×10−3 s−1, a comparison between strain-balanced and stress-balanced biaxial stretching cases
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Expected shapes of a bulged circular sheet for different values of k. (a) Incomplete hemisphere (k<1); (b) perfect hemisphere (k=1); (c) over-bulged hemisphere (k>1)
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Longitudinal and transverse cross sections of the three domes. (a) Incomplete hemisphere (k<1); (b) perfect hemisphere (k=1); (c) over-bulged hemisphere (k>1)

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