Predicting the onset of cracks in bulk metal forming by ductile damage criteria

Peter Christiansen, Chris Valentin Nielsen, Paulo A.F. Martins, Niels Oluf Bay

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Abstract

Three different ductile damage criteria, Ayada, normalized Cockcroft and Latham and a new shear stress based criterion taking into account hydrostatic tension, are utilized for predicting the onset of cracks in various deformation processes. It is found that the Ayada criterion predicts well the onset of cracks when they originate from hydrostatic tension. The shear based criterion predicts cracks triggered by shear and the normalized Cockcroft and Latham criterion indicates the overall area of onset of cracks caused by either hydrostatic or shear stresses. However the prediction is not as accurate as the Ayada criterion for cracks caused by hydrostatic tension.
Original languageEnglish
JournalProcedia Engineering
Volume207
Pages (from-to)2048-2053
ISSN1877-7058
DOIs
Publication statusPublished - 2017
EventInternational Conference on the Technology of Plasticity (ICTP 2017) - Cambridge, United Kingdom
Duration: 17 Sep 201722 Sep 2017

Conference

ConferenceInternational Conference on the Technology of Plasticity (ICTP 2017)
Country/TerritoryUnited Kingdom
CityCambridge
Period17/09/201722/09/2017

Keywords

  • Metal forming
  • Ductile damage
  • Crack initiation

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