Characterization of fracture loci in metal forming

P.A.F. Martins, Niels Bay, A.E. Tekkaya, A.G. Atkins

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Fracture in metal forming can occur in three different modes: (i) tensile; (ii) in-plane shear; and (iii) out-of-plane shear (respectively the same as modes I, II and III of fracture mechanics). The circumstances under which each mode will occur are identified in terms of plastic flow and microstructural ductile damage by means of an analytical framework to characterize fracture loci under plane stress conditions that also takes anisotropy into consideration. Experimental results retrieved from the literature give support to the presentation and show that plastic flow and failure in sheet forming results from competition between modes I and II whereas in bulk forming fracture results from competition between modes I and III. © 2014 Elsevier Ltd.
Original languageEnglish
JournalInternational Journal of Mechanical Sciences
Volume83
Pages (from-to)112-123
ISSN0020-7403
DOIs
Publication statusPublished - 2014

Keywords

  • Bulk metal forming
  • Crack separation modes
  • Fracture forming limit diagram
  • Fracture loci
  • Sheet metal forming
  • Ductile fracture
  • Fracture mechanics
  • Plastic flow
  • Sheet metal
  • Fracture forming limit diagrams
  • Fracture locus
  • In-plane shear
  • Micro-structural
  • Out-of-plane shear
  • Plane stress condition
  • Separation modes
  • Metal forming

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