Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Size Effects in bending processes - development of a methodology for identification and quantification



Datum: 12.04.2010


Author


Reporter

  • Prof. Dr.-Ing. habil. M. Merklein
  • Prof. Dr.-Ing. H. Hoffmann (TU München)
  • Prof. i.R. Dr.-Ing. Dr.-Ing. E.h. mult. Dr. h.c. mult. M. Geiger

The systematical design required for sufficient process stability of an economically efficient production of small metallic parts using metal forming technology is up to now hindered by so called size effects, that can be neglected in conventional length scale processes. Within this work a methodology enabling the identification and quantification of the influence of size effects on forming processes of metal foils exhibiting strain gradients is developed and verified using a scaled bending process. Resulting from these findings, the development and validation of approaches for an improved description of micro sheet metal forming processes via FE-simulation using the exemplary bending process applied in this work as reference was derived. Here, important foci were on the extension of the experimental data basis characterising the material behaviour being a determining input parameter regarding FE-simulation and the implementation of strain gradient dependent material behaviour into the FE-simulation.