In situ Characterization of Trans-laminar Fracture Toughness using X-ray Computed Tomography

Xiaoyang Sun, Takeda Shin-ichi, Michael Wisnom, Xiaodong Xu*

*Corresponding author for this work

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


The change in the critical strain energy release rate as damage evolves, known as the R-curve, is of crucial importance to the understanding of fracture behaviour. The examination of damage evolution ahead of the crack tip in order to determine accurately the crack increment is key for the determination of the R-curve. Conventional in situ methods such as optical measurements only examine the specimen surfaces. X-ray Computed Tomography (CT) offers satisfactory image quality, but conventional CT scanning requires the removal of the specimens from the test machine. If no dye penetrant is used, the specimens can be re-loaded, but some important information will be missing such as the early load drops corresponding to damage initiation. If dye penetrant is used, the specimens can no longer be re-tested. In contrast, in situ CT scanning can capture the detailed damage states ply-by-ply while the specimen is loaded and diminish the need for multiple specimens. In situ characterization of trans-laminar fracture toughness of composites using CT has not been attempted in the past. It has been proven successful in this research, and shown that a partial R-curve can be constructed with a single Extended Single-Edge-notch Tension (ESET) specimen.
Original languageEnglish
Article number100408
Number of pages4
JournalComposites Communications
Early online date10 Jul 2020
Publication statusPublished - 1 Oct 2020


  • Fracture
  • Non-Crimp Fabric (NCF)
  • R-curve
  • Computed Tomography (CT)

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