Prediction and analysis of ductile fracture in sheet metal forming - Part I: A modified Ayada criterion

H. S. Liu, Mingwang Fu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)


A modified ductile fracture criterion is proposed based on the traditional Ayada criterion and coded into the finite element simulation platform of VUMAT/ABAQUS for prediction and analysis of ductile fracture in metal plastic strain processes. In this modified ductile fracture criterion, stress triaxiality is taken into account, and more importantly, the exponential effect of the equivalent plastic strain on the damage behavior, which is generally ignored in other ductile fracture criteria, is also considered. The material related constants in the modified ductile fracture criterion are determined by tensile tests together with finite element simulations. The applicability and reliability of the ductile fracture criterion in ductile fracture prediction in two types of classic stress states, viz. shear stress, tensile stress in sheet metal forming, are investigated based on the deformation behavior and fracture occurrence in two case studies with two typical types of materials, i.e. Al 6061 and T10A. The materials have a wide range of plasticity. The simulation and experimental results verify the applicability and reliability of the developed ductile fracture criterion in prediction of the ductile fracture with and without necking in different stress states of plastic strain.
Original languageEnglish
Pages (from-to)1189-1210
Number of pages22
JournalInternational Journal of Damage Mechanics
Issue number8
Publication statusPublished - 1 Jan 2014


  • Ductile fracture
  • finite element simulation
  • fracture criterion
  • metal formability
  • sheet metal forming

ASJC Scopus subject areas

  • Computational Mechanics
  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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