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


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Voncken, R.M.J. and Sluis van der, O. and Post, J. and Huetink, J. (2004) FE calculations on a three stage metal forming process of Sandvik Nanoflex. In: NUMIFORM, International Conference on Numerical Methods in Industrial Forming Processes, 13-17 June, 2004, Columbus, Ohio.

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Abstract:Sandvik NanoflexTM 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.
Item Type:Conference or Workshop Item
Copyright:American Institute of Physics
Faculty:
Engineering Technology (CTW)
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Link to this item:http://purl.utwente.nl/publications/59484
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