Observations on Return Mapping Algorithms for Piecewise Linear Yield Criteria
Publication: International Journal of Geomechanics
Volume 8, Issue 4
Abstract
This paper shows that for perfect plasticity, the closest point projection method (CPPM) and the cutting plane algorithm (CPA) for return mapping are exactly equivalent for piecewise linear yield criteria under both associated and nonassociated plastic flow. The paper demonstrates this by presenting closed-form expressions for returned stresses in terms of predicted stresses. A consequence of this exact approach is that the final stresses can be obtained in a single iteration. The equivalence of CPPM and CPA is further demonstrated numerically by comparing five previously published algorithms for return mapping to Mohr–Coulomb in a finite-element analysis of bearing capacity. The analyses also highlight issues relating to singularities that occur at the corners of the Mohr–Coulomb surface. It is shown that many of these problems can be avoided if the return mapping is performed in principal stress space as opposed to general stress space.
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Acknowledgments
The writers gratefully acknowledge the support of the National Science Foundation under Grant No. CMS-0408150.
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Published In
International Journal of Geomechanics
Volume 8 • Issue 4 • July 2008
Pages: 253 - 265
Copyright
© 2008 ASCE.
History
Received: Jul 5, 2007
Accepted: Nov 20, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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