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Earing predictions based on asymmetric nonquadratic yield function
journal contribution
posted on 2000-08-07, 00:00 authored by Jeong YoonJeong Yoon, F Barlat, K Chung, F Pourboghrat, D Y YangA nonquadratic yield function (Yld96) which simultaneously accounts for the anisotropy of uniaxial yield stresses and r values was newly implemented in a finite element code. Yield surface shapes, yield stress and r-value directionalities of Yld96 were investigated and compared with those of the previous yield function, Yld91. Complete formulations for Yld96 implementation and the calculation of coefficients were also discussed for the convenient use of Yld96. A 2090-T3 aluminum alloy sheet sample was modeled and earing formation during a cup drawing test was simulated using the FEM code. The results of earing and thickness strain profiles were compared with the results obtained with Yld91. Investigations were further carried out with a translated yield surface to account for the strength differential effect observed in this material. Computation results with the translated yield surface were in very good agreement with experimental results. It was shown that the yield surface shape and translation have a significant influence on the prediction of the cup height profile during the drawing of a circular blank.
History
Journal
International journal of plasticityVolume
16Issue
9Pagination
1075 - 1104Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0749-6419Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2000, Elsevier Science Ltd.Usage metrics
Keywords
Science & TechnologyTechnologyEngineering, MechanicalMaterials Science, MultidisciplinaryMechanicsEngineeringMaterials Scienceyield functionplanar anistropyearingstrength differential effectsheet formingFEMINCREMENTAL DEFORMATION-THEORYFINITE-ELEMENT FORMULATIONSHEET METALSPLASTICITYSIMULATIONANISOTROPYBEHAVIORMechanical Engineering
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