Cold formability prediction by the modified maximum force criterion with a non-associated Hill48 model accounting for anisotropic hardening

J. Lian, D. C. Ahn, D. C. Chae, S. Münstermann, W. Bleck

Research output: Contribution to journalConference articleScientificpeer-review

Abstract

Experimental and numerical investigations on the characterisation and prediction of cold formability of a ferritic steel sheet are performed in this study. Tensile tests and Nakajima tests were performed for the plasticity characterisation and the forming limit diagram determination. In the numerical prediction, the modified maximum force criterion is selected as the localisation criterion. For the plasticity model, a non-associated formulation of the Hill48 model is employed. With the non-associated flow rule, the model can result in a similar predictive capability of stress and r-value directionality to the advanced non-quadratic associated models. To accurately characterise the anisotropy evolution during hardening, the anisotropic hardening is also calibrated and implemented into the model for the prediction of the formability.

Original languageEnglish
Article number032112
JournalJournal of Physics: Conference Series
Volume734
Issue number3
DOIs
Publication statusPublished - 1 Sep 2016
MoE publication typeA4 Article in a conference publication

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