Projects C: Materials

 Besides processes and systems, material and its properties are of central importance within sheet-bulk metal forming. Therefore material properties are being analysed in detail within project area C. However, development of material is not part of the research work. Project area C is of great importance to the TCRC as only with precise material modells good process models can be derived. A special focus will be on friction- and flow-behavior of the different materials typical used for these workpieces. Further research is aimed at more details of the material, i. e.  based on micro structure analysis subject to the stress history the findings are consolidated with experimental and simulation results of sheet-buld metal forming processes in order to be able to develop damage material models, which are able to anticipate the material failure within sheet-bulk metal forming. These results will e used within project areas A and B. Currently the modelling of flow and damage behaviour under changing strain- and formingconditions is investigated also taking two-phase structural conditions into account.

Project area C consists of 4 projects involving 8 researchers. A total of 5 institutes coming from all 3 universities that are members of TCRC 73 are included. The cooperation within project area C and the exchange of the  results is supported by the working groups Materials and Modeling and Simulation. The heads of these working groups are active in project area C as well. The work towards a unified material model is fundamental for all other project areas.

Modeling material as poly-cristaline structures and deriving continuum-mechanical models from that approach is the focus of the work in Hannover. The experemental work resulting in reliable data and the validation of the models using new testing methods is carried out in Dortmund. The data is also used in the joint project of Dortmund and Hannover targeted at damage modeling during SBMF. The work in Erlangen is focussed on a constitutive friction model covering the load during SBMF as well as the effect of lubrication and surface topography. Furthermor the optimisation of the numerical modeling of the forming processes and the blank is investigated in Erlangen.