Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Design and development of a mesoscopic model to consider size-effects at bulk metal forming by using finite element simulation



Datum: 25.02.2010


Author


Reporter

  • Prof. Dr.-Ing. habil. M. Merklein
  • Prof. Dr.-Ing. G. Hirt (RWTH Aachen)
  • Prof. i.R. Dr.-Ing. Dr.-Ing. E.h. mult. Dr. h.c. mult. M. Geiger

The scope of this work was to develop a strategy in order to map the impact of scaling-effects at bulk metal forming processes on the forming results by the use of finite element simulations. Due to the significant impact of the grain structure on the deformation behaviour, a strategy to create synthetic material structures has been defined. The thereby created material structures are passed to the FE-Simulation program as input parameter. Additionally if the synthetic material structure is designed, an analytical model has been created based on metal physics in order to describe the local material properties in dependency of the grain size, its orientation and position within the specimen. This strategy has been verified and discussed by using the cylindrical flat upsetting test. Also this strategy has been used to investigate the deformation behaviour of the can-backward extrusion process in order to ensure the portability to various deformation processes. Thus, the capability to describe non-homogeneous local deformation behaviour of materials at microscale has been proven.