An Experimental Study of Scaling Effects in Notched Quasi-isotropic Carbon/Epoxy Laminates under Compressive Loads

Xiaodong Xu*, Aakash Paul, Xiaoyang Sun, Michael R Wisnom

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

Abstract

The size effects in centre-notched quasi-isotropic carbon/epoxy laminates under compression were investigated. The in-plane dimensions of the baseline specimen were scaled up by a factor of up to 14. The centre-notched specimens were compared to open-hole specimens of the same dimensions. It was found that compressive strength of the small centre-notched specimen is similar to that of the open-hole specimen. However, as the in-plane dimensions increase, the centre notches are weaker than the open holes, and start to follow a Linear Elastic Fracture Mechanics (LEFM) scaling line. These trends were well captured by a Composite Compressive Strength Modeller (CCSM) using the fracture energy measured in the current study. Fibre micro-buckling was confirmed to be the dominant failure mechanism under compression. The failure mechanisms under compression were also compared against those under tension. Matrix splitting under compression was observed through X-ray Computed Tomography but was less extensive than under tensile loading.
Original languageEnglish
Article number106029
Number of pages11
JournalComposites Part A: Applied Science and Manufacturing
Volume137
Early online date2 Jul 2020
DOIs
Publication statusE-pub ahead of print - 2 Jul 2020

Keywords

  • Laminate
  • Strength
  • Fracture
  • CT analysis
  • Scaling effect

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