FE calculations on a three stage metal forming process of Sandvik Nanoflextm

R.M.J. Voncken, O. van der Sluis, J. Post, J. Huetink

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review


    Sandvik Nanoflex™ combines good corrosion resistance with high strength. This steel has good deformability in austenitic conditions. It belongs to the group of metastable austenites, which means that during deformation a strain‐induced transformation into martensite takes place. After deformation, transformation continues as a result of internal stresses. Both transformations are stress‐state and temperature dependent. A constitutive model for this steel has been formulated, based on the macroscopic material behaviour measured by inductive measurements. Both the stress‐assisted and the strain‐induced transformation into martensite have been incorporated in this model. Path‐dependent work hardening has also been taken into account. This article describes how the model is implemented in an internal Philips FE code called Crystal, which is a dedicated robust and accurate finite element solver. The implementation is based on lookup tables in combination with feed‐forward neural networks. The radial return method is used to determine the material state during and after plastic flow, however, it has been extended to cope with the stiff character of the partial differential equation that describes the transformation behaviour.
    Original languageEnglish
    Title of host publicationMaterials processing and design : modeling, simulation and applications
    Subtitle of host publicationNUMIFORM 2004 : proceedings of the 8th International Conference on Numerical Methods in Industrial Forming Processes
    EditorsSomnath Chosh, Jose M. Castro, June K. Lee
    Place of PublicationMelville, NY
    PublisherAmerican Institute of Physics
    ISBN (Electronic)0-7354-0189-6
    ISBN (Print)0-7354-0188-8
    Publication statusPublished - 13 Jun 2004
    Event8th International Conference on Numerical Methods in Industrial Forming Processes, NUMIFORM 2004 - Columbus, United States
    Duration: 13 Jun 200417 Jun 2004
    Conference number: 8


    Conference8th International Conference on Numerical Methods in Industrial Forming Processes, NUMIFORM 2004
    Abbreviated titleNUMIFORM
    Country/TerritoryUnited States


    • METIS-256016

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