Failure analysis of scarf-patch-repaired carbon fiber/epoxy laminates under compression

C. Soutis, F.Z. Hu

Research output: Contribution to journalArticlepeer-review


Simple analytical and numerical models are proposed to determine the optimum geometry and compressive strength of flush composite repairs. To account for the material nonlinearities and plastic deformation of the adhesive, the average stress failure criterion (ASFC) is used with the finite element stress distributions to estimate the ultimate strength of the three-dimensional repaired configuration. This avoids the need for a nonlinear analysis, thus saving on computation time and memory requirements. The simple scarf-joint analysis underestimates the strength of the scarf patch repair by more than 40% and predicts an optimum scarf angle of 4 deg compared with an angle of almost 7 deg obtained by the ASFC.
Original languageEnglish
Pages (from-to)737-740
Number of pages4
JournalAIAA Journal
Issue number4
Publication statusPublished - 4 Apr 2000


  • Stress concentration
  • stress distribution
  • compressive strength
  • composite laminates
  • numerical modeling
  • strength of materials
  • composite structures
  • plastic deformation
  • temperature effects
  • shear deformation


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