Numerical and experimental studies of the influence of curing and residual stresses on buckling in thin-walled, CFRP square-section profiles

Paweł Czapski, Patryk Jakubczak, Alexander J.G. Lunt, Filip Kaźmierczyk, Mariusz Urbaniak, Tomasz Kubiak

Research output: Contribution to journalArticlepeer-review


The study provides the first comprehensive experimental and numerical study of thin-walled, carbon fibre square-section columns subjected to static compression. The profiles were manufactured from unidirectional prepreg tape of Hexcel AS4 high-strength carbon fibres in HexPly® 8552 thermoset resin with ply angles [45/−45/45/−45]s. The dimensions of the columns were: (height × width × length) 80 mm × 80 mm × 240 mm and the wall thickness was 0.92 mm. Advanced Finite Element Models (FEM) of the residual stresses generated during production were used as a basis for simulations of static compression. The deformation predicted by these models showed excellent agreement with 3D scans of the columns. These results also highlighted the residual stress concentrations generated at sample corners during production. It was found that the residual stresses from the autoclaving process significantly enhance the buckling load performance (by ~35%) and that the models provide an effective comparison with the experimental results (
Original languageEnglish
Pages (from-to)114411
Number of pages1
JournalComposite Structures
Publication statusPublished - 31 Jul 2021


  • Carbon fibres
  • Finite element modelling
  • Buckling
  • Residual stresses
  • Thermal expansion

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