Initial R-curves for Trans-laminar Fracture of Quasi-isotropic Carbon/Epoxy Laminates from Specimens with Increasing Size

Xiaodong Xu*, Xiaoyang Sun, Michael R Wisnom

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

In this paper, a set of initial R-curves were measured for three different in-plane sizes using scaled Over-height Compact Tension (OCT) specimens and two different stacking sequences. The data reduction scheme was based on a Virtual Crack Closure Technique which is informed by the measured failure load and effective crack length. The R-curve effects were studied by using X-ray Computed Tomography to measure the crack length throughout fracture propagation. It was found that the initial R-curves measured from all three specimen sizes follow the same linearly increasing trend, with similar results for both stacking sequences. However, no plateau was seen on any of the measured R-curves, implying that even the largest specimens are not large enough to generate a full R-curve.
Original languageEnglish
JournalComposites Science and Technology
Publication statusAccepted/In press - 29 Sep 2021

Keywords

  • Fracture
  • Fracture toughness
  • X-ray computed tomography
  • R-curve

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