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Experimental determination of Through-Thickness Compression (TTC) enhancement factor for Mode II fracture energy

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)66-73
Number of pages8
JournalComposites Science and Technology
Early online date15 Jun 2018
DateAccepted/In press - 12 Jun 2018
DateE-pub ahead of print - 15 Jun 2018
DatePublished (current) - 8 Sep 2018


Mode II fracture energy, GIIC, is a critical parameter for determining the propagation of delamination in composite laminates. Its value can be affected by Through-Thickness Compression (TTC) stress acting on the crack tip and here this effect has been studied using IM7/8552 carbon/epoxy laminates with cut central plies. External TTC loads were applied through bi-axial testing. Unidirectional (UD) cut-ply specimens were used to determine the TTC enhancement factor, ηG, for GIIC. A similar enhancement effect was also found in Quasi-isotropic (QI) specimens with 2 extra cut central 0° plies inserted into the layup. The TTC enhancement factor was implemented in a Finite Element Analysis (FEA) framework using cohesive interface elements, showing that the determined ηG can be successfully used to model the effect of TTC on delamination.

    Research areas

  • B. Delamination, B. Fracture toughness, Bi-axial testing, C. Finite element analysis (FEA)

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 689 KB, PDF-document

    Licence: CC BY-NC-ND


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