A mixed elastoplastic/rigid-plastic material model

Han Huetink, Antonius H. van den Boogaard, Bert Rietman, J. Lof, Vincent T. Meinders

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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
Original languageUndefined
Pages (from-to)1421-1434
JournalInternational journal for numerical methods in engineering
Volume46
Issue number9
DOIs
Publication statusPublished - 1999

Keywords

  • Plasticity
  • forming processes
  • METIS-144574
  • IR-59322
  • Material model

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