Influence of initial back stress on the earing prediction of drawn cups for planar anisotropic aluminum sheets

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Anisotropy is closely related to the formability of sheet metal and should be considered carefully for more realistic analysis of actual sheet metal forming operations. In order to better describe anisotropic plastic properties of aluminum alloy sheets, a planar anisotropic yield function which accounts for the anisotropy of uniaxial yield stresses and strain rate ratios simultaneously was proposed recently. This yield function was used in the finite element simulations of cup drawing tests for an aluminum alloy 2008-T4. Isotropic hardening with a fixed initial back stress based on experimental tensile and compressive test results was assumed in the simulation. The computation results were in very good agreement with the experimental results. It was shown that the initial back stress as well as the yield surface shape have a large influence on the prediction of the cup height profile. (C) 1998 Elsevier Science S.A. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
1998
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, v.80-1, pp.433 - 437

ISSN
0924-0136
DOI
10.1016/S0924-0136(98)00148-4
URI
http://hdl.handle.net/10203/2709
Appears in Collection
ME-Journal Papers(저널논문)
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