A sheet metal necking formability diagram for nonlinear strain paths

Peter Christiansen*, Mikkel Ravn Boye Jensen, Grethe Winther

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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A new procedure for drawing forming limit curves is suggested. The theoretical basis for computing the forming limit curve due to diffuse necking, for nonlinear strain paths, is derived. The theoretically determined forming limit curve is compared with experimentally determined forming limits for both linear and bilinear strain paths. Reasonable agreement is observed. The procedure can also be utilized for nonlinear strain paths in general.
Original languageEnglish
JournalProceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
Issue number7
Pages (from-to)1287-1294
Number of pages8
Publication statusPublished - 2019


  • Sheet metal forming
  • Formability diagram
  • Necking instability
  • Nonlinear strain path

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