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Prediction of necking for two aluminum alloys under non-proportional loading by using an FE-based approach

Reyes, Aase Gavina Roberg; Hopperstad, Odd Sture; Berstad, Torodd; Lademo, Odd-Geir
Journal article, Peer reviewed
Published version
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2008+IJFO+08+3.pdf (Locked)
URI
http://hdl.handle.net/11250/2497270
Date
2008
Metadata
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  • Institutt for konstruksjonsteknikk [1569]
  • Publikasjoner fra CRIStin - NTNU [19694]
Original version
International Journal of Material Forming. 2008, 1 (4), 211-232.   10.1007/s12289-008-0384-6
Abstract
Forming Limit Diagrams (FLDs) were found numerically for sheets under non-proportional loading by means of an FE-based Marciniak–Kuczynski (M-K) analysis. The material model used in the analysis includes two instability criteria; a non-local criterion to detect incipient localized necking and a through-thickness shear instability criterion. The objective was to study whether the effects of pre-straining on the FLD could be predicted by the chosen modeling approach, and compare the results from the two instability criteria. The results with the two criteria were different, but both criteria were able to capture the strong strain-path dependence of the FLDs as the governing phenomenon is plastic instability.
Publisher
Springer Verlag
Journal
International Journal of Material Forming

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