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Abstract

Accurate analysis of composite delamination using interface elements relies on having sufficient elements within a softening region known as the cohesive zone ahead of a crack tip. The present study highlights the limitations of existing formulae used to predict numerical cohesive zone length and demonstrates modifications necessary for improved accuracy. Clarification is also provided regarding the minimum number of interface elements within the cohesive zone. Finally, appropriate values of numerical interfacial strength are examined. The results presented will aid the application of mesh design techniques that both preserve numerical accuracy, whilst minimising computational expense. 

Original languageEnglish
Pages (from-to)4774-4792
Number of pages19
JournalEngineering Fracture Mechanics
Volume75
Issue number16
Early online date26 Jun 2008
DOIs
Publication statusPublished - Nov 2008

Keywords

  • Composites
  • Delamination
  • Interface fracture
  • Finite element analysis
  • Cohesive zone modelling
  • Progressive delamination
  • INTERFACE ELEMENTS
  • DECOHESION ELEMENTS
  • NONLINEAR FRACTURE
  • BONDED JOINTS
  • MODELS
  • FORMULATION
  • SPECIMENS
  • FATIGUE
  • GROWTH

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