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Numerical implementation of a J2- and J3-dependent plasticity model based on a spectral decomposition of the stress deviator
Royal Institute of Technology, (KTH).
Royal Institute of Technology, (KTH).
2013 (English)In: Computational Mechanics, ISSN 0178-7675, E-ISSN 1432-0924, Vol. 52, no 5, 1059-1070 p.Article in journal (Refereed) Published
Abstract [en]

A new plasticity model with a yield criterion that depends on the second and third invariants of the stress deviator is proposed. The model is intended to bridge the gap between von Mises’ and Tresca’s yield criteria. An associative flow rule is employed. The proposed model contains one new non-dimensional key material parameter, that quantifies the relative difference in yield strength between uniaxial tension and pure shear. The yield surface is smooth and convex. Material strain hardening can be ascertained by a standard uniaxial tensile test, whereas the new material parameter can be determined by a test in pure shear. A fully implicit backward Euler method is developed and presented for the integration of stresses with a tangent operator consistent with the stress updating scheme. The stress updating method utilizes a spectral decomposition of the deviatoric stress tensor, which leads to a stable and robust updating scheme for a yield surface that exhibits strong and rapidly changing curvature in the synoptic plane. The proposed constitutive theory is implemented in a finite element program, and the influence of the new material parameter is demonstrated in two numerical examples.

Place, publisher, year, edition, pages
2013. Vol. 52, no 5, 1059-1070 p.
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-58915DOI: 10.1007/s00466-013-0863-6OAI: oai:DiVA.org:lnu-58915DiVA: diva2:1055008
Available from: 2016-12-09 Created: 2016-12-09 Last updated: 2016-12-16Bibliographically approved

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Kroon, Martin
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CiteExportLink to record
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Citation style
  • apa
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  • Other locale
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  • asciidoc
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