Journal
ENGINEERING FRACTURE MECHANICS
Volume 75, Issue 16, Pages 4774-4792Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2008.06.004
Keywords
Composites; Delamination; Interface fracture; Finite element analysis; Cohesive zone modelling
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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. (C) 2008 Elsevier Ltd. All rights reserved.
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