Prediction of six or eight ears in a drawn cup based on a new anisotropic yield function

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In this work, the recently proposed anisotropic yield function, W2004-18p [Barlat, F., Aretz, H., Yoon, J.W., Karabin, M.E., Brem, J.C., Dick, R.E., 2005. Linear transformation based anisotropic yield function, Int. J. Plasticity 21, 1009], is implemented in a finite element (FE) code for application to the cup drawing simulation of a circular blank sheet. A short review of the Yld2004-18p relevant features is provided and the stress integration scheme for its implementation in FE codes is described. The simulation of the drawing process is conducted for an aluminum alloy sheet sample (AA2090-T3). The predicted and experimental cup height profiles (earing profiles) with six ears are shown to be in excellent agreement. Additional simulations on a ficticious material are performed in order to show that the yield function W2004-18p can lead to the prediction of cups with eight ears. In order to achieve these results, a sufficient number of input data are required to calculate the yield function coefficients. Finally, a simplified analytical approach that relates the earing profile to the r-value directionality is also presented in this paper. It is shown that this approach can be very useful as a first approximation of the earing profile of drawn cups. (c) 2005 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2006
Language
English
Article Type
Article
Keywords

KINEMATIC HARDENING LAWS; SPRING-BACK EVALUATION; ALUMINUM-ALLOY SHEETS; FINITE-ELEMENT-METHOD; INCREMENTAL DEFORMATION-THEORY; METALS; FORMULATION; PART; SIMULATION; IMPLEMENTATION

Citation

INTERNATIONAL JOURNAL OF PLASTICITY, v.22, no.1, pp.174 - 193

ISSN
0749-6419
DOI
10.1016/j.ijplas.2005.03.013
URI
http://hdl.handle.net/10203/203809
Appears in Collection
ME-Journal Papers(저널논문)
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