FLC Nov. ´14
Time-dependent Methods for the Evaluation of FLC
6 - 7 November 2014, Zurich, Switzerland
The formability of metal sheets is up until today evaluated using the Forming Limit Curves (FLC) proposed by Keeler and Backhofen. Novel digital image correlation (DIC) techniques clearly demonstrate that the transition from homogeneous deformation to localized straining is not abrupt. This means that the limit strain can only be defined based on some heuristic rule.
The workshop aims to outline new approaches for the evaluation of FLCs. Special stress will be put on the comparison between the standard «cross-section» method and the newly proposed «time-dependent» method. The characteristics of the new evaluation method will be discussed in detail, especially focusing on modifications and extensions, which will enable its use in fully automated optical measurement environments.
As a secondary focus, the workshop will treat the topic of the so-called «Generalized FLCs». In addition to the localization limits, these also describe the fracture strains. The relevance of the latter for forming processes as well as methods for their experimental characterization will be discussed in detail. Furthermore the transferability of these limits to generic forming processes (e.g. hemming, hole expansion etc.) will be assessed. Finally the FLC-based fracture criteria will be compared to stress based approaches, such as the extended Mohr-Coulomb models proposed by Wierzbicki and Bai.
The workshop aims to reach developers of FLC-evaluation methods, students and researchers working in the field of failure characterization, as well as FEM users who envisage a reliable prediction of the formability limits in sheet metal forming.
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Please find more information about the workshop here.