Tailoring Sandwich Face/Core Interfaces for Improved Damage Tolerance: Part II: Experiments

Christian Lundsgaard-Larsen, Christian Berggreen, Leif A. Carlsson

Research output: Contribution to journalJournal articleResearchpeer-review


A face/core debond in a sandwich structure may propagate in the interface or kink into either the face or core. It is found that certain modifications of the face/core interface region influence the kinking behavior, which is studied experimentally in the present paper. A sandwich double cantilever beam specimen loaded by uneven bending moments (DCB-UBM) allows for accurate measurements of the J integral as the crack propagates under large scale fibre bridging. By altering the mode-mixity of the loading, the crack path changes and deflects from the interface into the adjacent face or core. The transition points where the crack kinks are identified and the influence of four various interface design modifications on the propagation path and fracture resistance are investigated.
Original languageEnglish
JournalApplied Composite Materials
Issue number6
Pages (from-to)621-637
Publication statusPublished - 2010


  • J integral
  • Fibre bridging
  • Crack kinking
  • Sandwich structure


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