Abstract
Localized necking in thin metal sheets is analyzed by using the M-K-model approach, and the effect of a number of different non-proportional strain paths prior to the occurrence flow localization are considered. The analyses account for plastic anisotropy, using four different anisotropic plasticity models to fit a set of experimental data for cold-rolled steel sheet. The predicted forming limit diagrams show strong dependence on whether or not the load on the sheet is removed between two load steps on a non-proportional strain path. This dependence is investigated in detail for one of the anisotropic plasticity models, and it is shown that elastic straining plays a large role, as the stresses quickly move from one point of the yield surface to another. When the load is removed between steps, the stress point moves in a different manner, which results in quite different flow localization response. (C) 2000 Elsevier Science Ltd. All rights reserved.
Original language | English |
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Journal | International Journal of Mechanical Sciences |
Volume | 42 |
Issue number | 5 |
Pages (from-to) | 867-887 |
ISSN | 0020-7403 |
DOIs | |
Publication status | Published - May 2000 |
Keywords
- plasticity
- anisotropy
- finite strains
- instability