PLY thickness and fibre orientation effects in multidirectional composite laminates subjected to combined tension/compression and shear

Tobias Laux*, Khong Wui Gan*, Janice M Barton, Ole T Thomsen

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)


The effects of laminate lay-up and multiaxial loading on the failure of multidirectional laminates can be significant. Thus, ply thickness and fibre orientation effects in quasi-isotropic carbon/epoxy laminates subjected to combined tension-shear and compression-shear loading are investigated. Three laminate lay-ups with equivalent thickness and homogenised elastic
properties, but with different ply thicknesses and ply orientation angles were studied using open-hole specimens. Combined tension/compression-shear loading was applied using a new Modified Arcan Fixture (MAF). A methodology for identifying the failure behaviour based on stereo Digital Image Correlation (DIC) is devised. The results showed that ply thickness has a strong effect on the failure behaviour in combined tension-shear, whereas the effect is small in
compression-shear loading. No significant effect of the relative fibre orientation angles was observed under either loading regime. The experimental approach provides a new tool to investigate composite laminates under the full tension/compression-shear loading regime.
Original languageEnglish
Article number105864
JournalComposites Part A: Applied Science and Manufacturing
Early online date6 Mar 2020
Publication statusPublished - Jun 2020



  • A. Laminates
  • B. Multiaxial testing
  • B. Lay-up effects
  • B. Strength

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