Prediction of limit strains during non-proportional load paths with a change in loading direction

W. Volk, M. Gruber, R. Norz

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Many different models have been published to predict failure after non-proportional load paths. Most of those models are phenomenological and heuristical models. They require a profound knowledge about the material. Examples are the enhanced Modified Maximum Force Criterion (eMMFC), the Polar Effective Plastic Strain-model (PEPS) or the Generalized Forming Limit Concept (GFLC). In addition to the load path, the loading direction has a significant influence on the formability of sheet metals. The mentioned models currently neglect this influence. By extending the GFLC-model by the parameter of loading direction, this influence is taken into account. By analyzing an acceptable number of bi-linear experiments, it is possible to calibrate the proposed model for a micro-alloyed steel HC340LA. Therewith an arbitrary load path with a change in loading direction can be evaluated. The results of this contribution show the effectiveness of this approach by different experiments.

Original languageEnglish
Article number012069
JournalIOP Conference Series: Materials Science and Engineering
Issue number1
StatePublished - 17 Nov 2020
Event39th International Deep-Drawing Research Group Conference, IDDRG 2020 - Seoul, Korea, Republic of
Duration: 26 Oct 202030 Oct 2020


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