Interfacial crack arrest in sandwich panels with embedded crack stoppers subjected to fatigue loading

G. Martakos, C. Andreasen, C. Berggreen, O. Thomsen

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

A novel crack arresting device has been implemented in sandwich panels and tested using a special rig to apply out-of-plane loading on the sandwich panel face-sheets. Fatigue crack propagation was induced in the face-core interface of the sandwich panels which met the crack arrester. The effect of the embedded crack arresters was evaluated in terms of the achieved enhancement of the damage tolerance of the tested sandwich panels. A finite element (FE) model of the experimental setup was used for predicting propagation rates and direction of the crack growth. The FE simulation was based on the adoption of linear fracture mechanics and a fatigue propagation law (i.e. Paris law) to predict the residual fatigue life-time and behaviour of the test specimens. Finally, a comparison between the experimental results and the numerical simulations was made to validate the numerical predictions as well as the overall performance of the crack arresters.
Original languageEnglish
Pages (from-to)55-76
Number of pages22
JournalApplied Composite Materials
Volume24
Issue number1
Early online date18 Aug 2016
DOIs
Publication statusPublished - 1 Feb 2017

Keywords

  • Fatigue
  • Fracture mechanics
  • Finite element analysis
  • Composites
  • Sandwich structures

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