Effect of pre-existing damage on delamination growth in repeatedly indented composites

L. Huo, C. Kassapoglou, R. C. Alderliesten*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Improvements in current design approaches require further studies of the damage interaction effects of composite materials subjected to repeated out-of-plane concentrated loads. To that end, a combined simulation and experimental investigation on composite laminate under repeated indentations is reported. The repeated indentations consist of seven identical peak-force indentations that are separately applied to the centre of the laminate. The results show that delaminations grow in all seven indentations, which can be interpreted as a continuous degradation of the effective delamination growth threshold with each subsequent indentation. More specifically, the second indentation effective delamination growth threshold is 62.4 MPa, which is about 19 % lower compared to the first one (77.2 MPa). Subsequently, the delamination growth threshold degraded approximately linearly with indentation. This effective delamination growth threshold reduction can be associated with the occurrence and evolution of the crack-rich zone preceding the delamination front.

Original languageEnglish
Article number113068
Number of pages12
JournalMaterials and Design
Publication statusPublished - 2024


  • Delamination growth
  • Polymer-matrix composites
  • Quasi-static indentation
  • Strength degradation


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