A concept for defining the mixed-mode behaviour of tough epoxy film adhesives by single specimen design

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Fracture modes I and II interact in mixed-mode loading conditions, and the interaction is typically taken into account using a mixed-mode fracture criterion. In this work, a concept for defining the criterion is developed through an experimental-numerical simulation analysis. The mixed-mode behaviour for the criterion is tested and analysed with a single specimen design. The design of the specimen simplifies the measurement when complex test arrangements and preparations for various specimen geometries are excluded in practice. Here, the mixed-mode fracture behaviour of the specimen is analysed in detail using digital image correlation (DIC). The DIC data are used in collaboration with a finite element–based crack onset analysis, including the virtual crack closure technique, in order to consider the typical simplifications and their effects on the mixed-mode criterion. As a benchmark case, the fracture criterion is determined for an epoxy film adhesive FM 300-2 using the developed approach. The developed approach was shown to be feasible and effective for defining the mixed-mode fracture criterion. The determined Power law criterion’s exponents were below unity, which points out that the common (presumed) exponent values in the current literature are actually unconservative.
Original languageEnglish
Pages (from-to)1982-1999
Number of pages18
JournalJournal of Adhesion Science and Technology
Issue number18
Publication statusPublished - 2020
Publication typeA1 Journal article-refereed


  • adhesive
  • mixed-mode testing
  • epoxy
  • virtual crack closure technique
  • digital image correlation

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  • Publication forum level 1


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