Unification of strength scaling between unidirectional, quasi-isotropic, and notched carbon/epoxy laminates

Xiaodong Xu*, Michael R. Wisnom, Kuan Chang, Stephen R. Hallett

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

9 Citations (Scopus)
255 Downloads (Pure)

Abstract

An investigation into size effects and notch sensitivity in quasi-isotropic carbon/epoxy laminates was carried out. The purpose is to draw a complete picture of the strength scaling in unidirectional, quasi-isotropic, and notched carbon/epoxy laminates. A link was established between the strength scaling of the unidirectional and quasi-isotropic laminates. Efforts were made to understand the relationship between unnotched and open-hole strengths. For very small holes, the notched strengths approach the unnotched strength limit. A scaling law based on Weibull statistics was used to predict the unnotched laminate strengths. For very large holes, the same scaling law in conjunction with a detailed 3D ply-by-ply FE analysis with matrix cracks in the 90° plies and delamination cohesive interface elements was used to predict the large notched strengths. A good agreement between the modelling and experimental results was achieved. The effects of 90° matrix cracks on unnotched and notched strengths were also studied.

Original languageEnglish
Pages (from-to)296-305
Number of pages10
JournalComposites Part A: Applied Science and Manufacturing
Volume90
Early online date25 Jul 2016
DOIs
Publication statusPublished - 1 Nov 2016

Keywords

  • A. Laminates
  • B. Strength
  • B. Stress concentrations
  • Scaling

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