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On the efficiency and accuracy of stress integration algorithms for constitutive models based on non-associated flow rule
journal contribution
posted on 2018-03-01, 00:00 authored by H Hippke, N Manopulo, Jeong YoonJeong Yoon, P HoraConstitutive models based on non-associated flow rule enable the accurate description of complex anisotropy phenomena by using distinct, but relatively simple, mathematical description for yield function and plastic potential. The computational complexity of stress integration procedure may thus be significantly reduced. The amount by which this advantage is reflected to the total computation time is, however, a function of the nonlinearity of the problem at hand. The present work aims to make a systematic comparison of two different stress integration algorithms, used in conjunction to non-associated flow rule. A fully explicit and semi-implicit integration scheme are analyzed in terms of accuracy and speed. The implemented yield model is Yld2000-2d with isotropic hardening. The validity of the stress-integration approaches is assessed based on the ability to reproduce stress-ratios, r-values and tensile test results. Additionally, measured earing profiles in cup drawing experiments are compared. The fully explicit implementation shows significant advantages in terms of speed.
History
Journal
International journal of material formingVolume
11Issue
2Pagination
239 - 246Publisher
SpringerLocation
Paris, FrancePublisher DOI
ISSN
1960-6206eISSN
1960-6214Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2017, Springer-Verlag FranceUsage metrics
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No categories selectedKeywords
sheet metal fomingFEMnon-AFRScience & TechnologyTechnologyEngineering, ManufacturingMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringEngineeringMaterials ScienceALUMINUM-ALLOY SHEETSYIELD FUNCTIONPLASTIC-DEFORMATIONEARING PREDICTIONSMETALSPRESSUREFORMULATIONCRITERIONBEHAVIORPART
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