Non-Uniform Compressive Strength of Debonded Sandwich Panels: I. Experimental Investigation

Alexandros Nøkkentved, Christian Lundsgaard-Larsen, Carl Christian Berggreen

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    Face/core debond-damaged sandwich panels exposed to non-uniform compression loads are studied. The panel geometry is rectangular with a centrally located circular debond. The study primarily includes experimental methods, but simple finite element calculations are also applied. The complexity of applying a controlled non-uniform compressive load to the test panels requires a strong focus on the development of a suitable testrig. This is done by the extensive use of product development methods. The experimental results based on full-scale testing of 10 GFRP/foam core panels with prefabricated debonds show a considerable strength reduction with increasing debond diameter, with failure mechanisms varying between fast debond propagation and wrinkling-introduced face compression failure for large and small debonds, respectively. Residual strength predictions are based on intact panel testing, and a comparison between a simple numerical model and the experimental results shows fair agreement.
    Original languageEnglish
    JournalJournal of Sandwich Structures and Materials
    Issue number6
    Pages (from-to)461-482
    Publication statusPublished - 2005


    • Debond damage
    • Debond spreading
    • Non-uniform compressive load
    • Residual strength
    • Composite materials
    • Sandwich panels


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