Prediction of sheet forming limits with Marciniak and Kuczynski analysis using combined isotropic–nonlinear kinematic hardening
| Autor: | Daniel E. Green, Morteza Nurcheshmeh |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Bauschinger effect Work hardening Mechanics Condensed Matter Physics Forging Forming limit diagram Mechanics of Materials visual_art visual_art.visual_art_medium Hardening (metallurgy) Formability General Materials Science Sheet metal Civil and Structural Engineering Necking |
| Zdroj: | International Journal of Mechanical Sciences. 53:145-153 |
| ISSN: | 0020-7403 |
| DOI: | 10.1016/j.ijmecsci.2010.12.004 |
| Popis: | The forming limit curve (FLC), a plot of the limiting principal surface strains that can be sustained by sheet metals prior to the onset of localized necking, is useful for characterizing the formability of sheet metal and assessing the forming severity of a drawing or stamping process. Both experimental and theoretical work reported in the literature has shown that the FLC is significantly strain-path dependent. In this paper, a modified Marciniak and Kuczynski (MK) approach was used to compute the FLC in conjunction with two different work-hardening models: an isotropic hardening model and a mixed isotropic–nonlinear kinematic hardening model, which is capable of describing the Bauschinger effect. Predictions of the FLC using the MK analysis have been shown to be dependent on the shape of the initial yield locus and on its evolution during work hardening; therefore the hardening model has an influence on the predicted FLC. In this investigation, published experimental FLCs of AISI-1012 low carbon steel and 2008-T4 aluminum alloy sheets that were subjected to various nonlinear loading paths were compared to predictions using both hardening models. The predicted FLCs were found to correlate quite well with experimental data and the effects of strain path changes and of the hardening model on predicted FLCs are discussed. |
| Databáze: | OpenAIRE |
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