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 (ICCM20) - Copenhagen, Denmark
Duration: 19 Jul 201524 Jul 2015
Conference number: 20

Conference

Conference20th International Conference on Composite Materials (ICCM20)
Number20
CountryDenmark
CityCopenhagen
Period19/07/201524/07/2015

Keywords

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

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