Journal
STEEL RESEARCH INTERNATIONAL
Volume 86, Issue 8, Pages 852-860Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/srin.201400566
Keywords
non-associated flow rule; finite element analysis; anisotropy; earin
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Funding
- FCT in Portugal [PTDC/EME-TME/109119/2008]
- Fundação para a Ciência e a Tecnologia [PTDC/EME-TME/109119/2008] Funding Source: FCT
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Prediction of more than four ears in a cup drawing process can be successfully achieved by considering r-value and stress directionalities. Yld2004-18p based on associated flow rule([1]) and Yld2000-2D based on non-associated flow rule([2]) are the examples. The former, however, is more costly in terms of computational efficiency than the latter. In this work, an anisotropic constitutive model based on non-associated flow rule which combines two different functions, Hill (1948) and Yld2000-2d, is implemented to a user defined material model. The accuracy of the anisotropic directionalities (yield stresses and plastic strain ratios) is evaluated. Simulation of a mini-die cup drawing with a body stock alloy predicted eight ears, in good agreement with the experimental results. The use of Hill (1948) model for the yield function and Yld2000-2d for plastic potential under the framework of non-associated flow rule led to accurate prediction of up to eight ears at the lower computational cost.
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