Characterisation and modelling of the plastic material behaviour and its application in sheet metal forming simulation

H. Vegter, Carel H.L.J. ten Horn, Yuguo An, E.H. Atzema, Eisso H. Atzema, H.H. Pijlman, Antonius H. van den Boogaard, Han Huetink

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Abstract

The application of simulation models in sheet metal forming in automotive industry has proven to be beneficial to reduce tool costs in the designing stage and for optimising current processes. Moreover, it is a promising tool for a material supplier to optimise material choice and development for both its final application and its forming capacity. The present practice requires a high predictive value of these simulations. The material models in these simulation models need to be developed sufficiently to meet the requirement of the predictions. For the determination of parameters for the material models, mechanical tests at different strain paths are necessary 1. Usually, the material models implemented in the simulation models are not able to describe the plastic material behaviour during monotonic strain paths sufficiently accurate 2. This is true for the strain hardening model, the influence of strain rate and the description of the yield locus in these models. A first stage is to implement the improved material models which describe this single strain path behaviour in a better way. In this work, different yield criteria, a hardening model and their comparison to experiments are described extensively. The improved material model has been validated initially on forming limit curves which are determined experimentally with Nakazima strips. These results will be compared with predictions using Marciniak-Kuczinsky-analysis with both the new material model and the conventional material model. Finally, the validation on real pressed products will be shown by comparing simulation results using different material models with the experimental data. The next challenge is the description of the material after a change of strain path. Experimental evidence given here shows that this behaviour cannot be treated using the classical approach of an equivalent strain as the only history variable.
Original languageEnglish
Title of host publication7th International Conference on Computational Plasticity, COMPLAS VII
EditorsE Onate, D.R.J Owen
Place of PublicationBarcelona
PublisherCIMNE Barcelona
Pages-
Number of pages20
ISBN (Print)84-9599922-6
Publication statusPublished - 7 Apr 2003
Event7th International Conference on Computational Plasticity, COMPLAS 2003 - Barcelona, Spain
Duration: 7 Apr 200310 Apr 2003
Conference number: 7

Conference

Conference7th International Conference on Computational Plasticity, COMPLAS 2003
Abbreviated titleCOMPLAS VII
CountrySpain
CityBarcelona
Period7/04/0310/04/03

Keywords

  • METIS-216381
  • IR-59451

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