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A mixed elastoplastic/rigid–plastic material model
Author(s) -
Huétink J.,
Van den Boogaard A. H.,
Rietman A. D.,
Lof J.,
Meinders T.
Publication year - 1999
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/(sici)1097-0207(19991130)46:9<1421::aid-nme706>3.0.co;2-p
Subject(s) - plasticity , convergence (economics) , forming processes , limit (mathematics) , range (aeronautics) , euler's formula , strain (injury) , materials science , mathematics , mechanics , structural engineering , mathematical analysis , engineering , composite material , physics , medicine , economics , economic growth
In forming process simulations, the rigid–plastic material model is widely used because of its numerically robust behaviour. The model yields accurate results, as long as the strain increments are large compared to the elastic limit strain. In cases where the strain increments are small e.g. in dead metal zones or in case of elastic spring back the model is unstable or inaccurate. In this paper a new integration algorithm is described for large strain plastic deformations. The algorithm degenerates to the Euler forward elastoplastic model for small strain increments and to the rigid–plastic model for large strain increments. The model benefits from the advantages of both models: accuracy and fast convergence over a large range of strain increments. The applicability of the method to forming process simulations is demonstrated by several examples. Copyright © 1999 John Wiley & Sons, Ltd.