Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Enhancement and improvement of test setup and evaluation for the determination of forming limit curve

Datum: 02.12.2014



  • Prof. Dr.-Ing. habil. M. Merklein
  • Prof. Dr.-Ing. M. Schmidt

The scope of this work is the enhancement and improvement of the test set-up and the evaluation method for the determination of forming limit curves. Within the investigations the significant influencing parameters concerning experiment and evaluation were identified and their effect quantified. In addition to comprehensive studies on friction and bending effect to the sample, a new time-based evaluation method was presented and validated with measurement results of real car body parts. In further experimental analysis a method for tests at elevated temperatures was developed. Thermography measurements deepened the understanding of the process and enabled an improvement of the test procedure by ensuring a homogeneous temperature distribution in the sample. This method can be used for reliable and reproducible temperature dependent forming limit curves. The work improved the material characterization at industrially relevant conditions.