Earing Prediction in Cup Drawing using the BBC2008 Yield riterion

Marko Vrh; Miroslav Halilovič; Bojan Starman; Boris Štok; Dan-Sorin Comsa; Dorel Banabic

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자료유형: 학술대회자료

저자정보: Marko Vrh (University of Ljubljana) Miroslav Halilovič (University of Ljubljana) Bojan Starman (University of Ljubljana) Boris Štok (University of Ljubljana) Dan-Sorin Comsa (Technical University of Cluj Napoca) Dorel Banabic (Technical University of Cluj Napoca)

저널정보: 한국소성·가공학회 기타자료 The 8th International Conference and Workshop on numerical simulation of 3D seet metal forming processes (NUMISHEET 2011)

발행연도: 2011.8

수록면: 142 - 149 (8page)

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The paper deals with constitutive modelling of highly anisotropic sheet metals. It presents FEM based earing predictions in cup drawing simulation of highly anisotropic aluminium alloys where more than four ears occur. For that purpose the BBC2008 yield criterion, which is a plane-stress yield criterion formulated in the form of a finite series, is used. Thus defined criterion can be expanded to retain more or less terms, depending on the amount of given experimental data. In order to use the model in sheet metal forming simulations we have implemented it in a general purpose finite element code ABAQUS/Explicit via VUMAT subroutine, considering alternatively eight or sixteen parameters (8p and 16p version). For the integration of the constitutive model the explicit NICE (Next Increment Corrects Error) integration scheme has been used. Due to the scheme effectiveness the CPU time consumption for a simulation is comparable to the time consumption of built-in constitutive models. Two aluminium alloys, namely AA5042-H2 and AA2090-T3, have been used for a validation of the model. For both alloys the parameters of the BBC2008 model have been identified with a developed numerical procedure, based on a minimization of the developed cost function. For both materials, the predictions of the BBC2008 model prove to be in very good agreement with the experimental results. The flexibility and the accuracy of the model together with the identification and integration procedure guarantee the applicability of the BBC2008 yield criterion in industrial applications.

#Anisotropy #Yield criteria #BBC2008 model #Earing prediction #Numerical integration #NICE scheme #Simulation

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