The application of J integral to measure cohesive laws in materials undergoing large scale yielding

Bent F. Sørensen, Stergios Goutianos

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    Abstract

    We explore the possibility of determining cohesive laws by the J-integral approach for materials having non-linear stress-strain behaviour (e.g. polymers and composites) by the use of a DCB sandwich specimen, consisting of stiff elastic beams bonded to the non-linear test material, loaded with pure bending moments. For a wide range of parameters of the non-linear material, the plastic unloading during crack extension is small, resulting in J integral values (fracture resistance) that deviate maximum 15% from the work of the cohesive traction. Thus the method can be used to extract the cohesive laws directly from experiments without any presumption about their shape. Finally, the DCB sandwich specimen was also analysed using the I integral to quantify the overestimation of the steady-state fracture resistance obtained using the J integral based method.
    Original languageEnglish
    Title of host publicationProceedings of the 20th International Conference on Composite Materials
    Number of pages9
    PublisherICCM20 Secretariat
    Publication date2015
    Publication statusPublished - 2015
    Event20th International Conference on Composite Materials - Copenhagen, Denmark
    Duration: 19 Jul 201524 Jul 2015
    Conference number: 20
    http://iccm20.org/

    Conference

    Conference20th International Conference on Composite Materials
    Number20
    Country/TerritoryDenmark
    CityCopenhagen
    Period19/07/201524/07/2015
    Internet address

    Keywords

    • Fracture mechanics testing
    • Delamination
    • J integral
    • Non-linear stress-strain

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