Post-buckled propagation model for compressive fatigue of impact damaged laminates

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Abstract

An analytical model for prediction of compressive fatigue threshold strains in composite plates with barely visible impact damage (BVID) is presented. The model represents the complex damage morphology as a single circular delamination at a critical level and calculates the strain at which thin-film buckling of the circular delaminated region occurs. The threshold strain is defined as the strain at which the strain energy release rate for the fracture of post-buckled delaminated plies along the delamination is equal to the critical Mode I value (G1C) for the resin. The model predicts the critical through-thickness level for delamination, the stability of delamination growth and also the sensitivity to experimental error in geometric measurements of the damage area. Results obtained using the model show an agreement of fatigue strain to within 4% of experimental values for four sets of data reported in the literature.
Original languageEnglish
Pages (from-to)4349-4361
Number of pages13
JournalInternational Journal of Solids and Structures
Volume45
Issue number16
Early online date25 Mar 2008
DOIs
Publication statusPublished - 1 Aug 2009

Keywords

  • Composite materials
  • Fatigue
  • Energy release rate
  • Propagation
  • Delamination
  • Post-buckling
  • Laminate

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