Optimization of laminates' fracture toughness using design of experiments and response surface

Assimina A. Pelegri, Anand Tekkam

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Maximization of mode I critical delamination fracture toughness (GIC) in cross ply graphite-epoxy laminates is studied using Design of Experiments and Taguchi arrays. The novel methodology proposed allows continuous and discrete factors to be considered simultaneously. Main and interactive factor effects on GIC are evaluated. Selection of factors is based on design and material criteria; the ones considered are: width, length, thickness, stacking angle and stacking sequence. A Fractional Factorial experiment is used to reduce the number of tests. Double Cantilever Beam specimens are used for all mode I experiments. Statistically significant factors are culled and a response equation (RE), based on the importance of each factor, is established. The RE is then employed to optimize GIC within the given set of restrictions. The effect of interfaces on delamination propagation is also investigated.

Original languageEnglish (US)
Pages (from-to)579-596
Number of pages18
JournalJournal of Composite Materials
Issue number7
StatePublished - 2003

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Chemistry


  • Composites
  • Delamination
  • Design of experiments
  • Fracture toughness
  • Laminate
  • Optimization
  • Response surface
  • Statistical analysis
  • Taguchi

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