Performance of low‐order triangular elements during plastic flow

O.M. Heeres (Delft University of Technology, Koiter Institute Delft, Faculty of Civil Engineering, Delft, The Netherlands)
R. de Borst (Delft University of Technology, Koiter Institute Delft, Faculty of Civil Engineering, Delft, The Netherlands)

Engineering Computations

ISSN: 0264-4401

Publication date: 1 February 1999

Abstract

An important characteristic of many soil models is a volume change during plastic flow. In computations, this plastic volume change is expressed via a kinematic constraint on the possible deformations. Due to this constraint the plane‐strain three‐noded triangular element exhibits locking when plastic deformations occur, under dilatant, contractant and isochoric conditions. It is demonstrated that using the method of enhanced assumed strains by Simol this locking cannot be remedied. For six‐noded wedges and four‐noded and five‐noded pyramids the same conclusion is obtained.

Keywords

Citation

Heeres, O.M. and de Borst, R. (1999), "Performance of low‐order triangular elements during plastic flow", Engineering Computations, Vol. 16 No. 1, pp. 70-87. https://doi.org/10.1108/02644409910251283

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MCB UP Ltd

Copyright © 1999, MCB UP Limited

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