Measurement and Calculation of Elastic Properties in Low Carbon Steel Sheet

Low carbon steel has found a wide range of applications in industry due to its high
formability, i.e. it can withstand large strains during plastic deformation in the forming process
retaining acceptable strength. The inner and outer panels of a car body are good examples of such
an implementation and material goes into production in sheet form. However, although low
carbon steel has been used in this application for many decades, a reliable predictive capability of
the forming process and ìspringbackî has still not been achieved. Therefore, to provide new
information in this area cold-rolled low carbon steel sheet before and after it has been subjected
to biaxial 25%-strain has been studied. This kind of straining is a good example of real
deformation processes.
In general, higher strength and elastic properties are matters of primary concern. Both
experimental measurements and numerical calculations have been utilized to evaluate these
properties. However, the deformation process is directly related to deformation texture
development and, as consequence, to the introduction of anisotropy in the properties of interest. It
is in this area that both experiments and modeling are lacking so that a better control of properties
and processes can be achieved.
In the present investigation we employ several measurement techniques for elastic property
measurements (dynamic mechanical analysis, static four point bending, tensile test) and several
calculation schemes (orientation distribution function averaging, finite element analysis) as well
as texture measurements (neutron diffraction, electron back scattering diffraction). The following
objectives are pursued:
* To test a range of different experimental techniques for elastic property measurements
in sheet metals;
* To validate numerical calculation methods of the elastic properties by experimental
* To evaluate elastic properties changes (and texture development) during biaxial
This comprehensive approach to the problem has produced new results the details of which will
be presented.