Fatigue Debond Growth in Sandwich Structures Loaded in Mixed Mode Bending (MMB)

Amilcar Quispitupa (Invited author), Christian Berggreen (Invited author), Leif A. Carlsson (Invited author)

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Static and cyclic debond growth in sandwich specimens loaded in mixed mode bending (MMB) is examined. The MMB sandwich specimens were manufactured using H100 PVC foam core and E-glass/polyester non-crimp quadro-axial [0/45/90/-45]s DBLT-850 face sheets. Static test were performed to determine the fracture toughness of the debonded sandwich specimens at different mixed mode loadings. The mixed mode ratio (mode I to mode II) was controlled by changing the lever arm distance of the MMB test rig. Compliance technique and visual inspection was employed to measure the crack length during fatigue. Fatigue tests were performed at 90% of the static fracture toughness at a loading ratio of R=0.1. Fatigue results revealed higher debond crack growth rates when the lever arm distance was increased. For some specimens, the crack propagated just below the face/core interface in the foam core and for others the crack kinked into the face sheet.
Original languageEnglish
Title of host publicationProceedings of the 13. European Conference on Composite Materials : Composites for Sustainable Progress
PublisherBritish Welding Research Association
Publication date2008
Publication statusPublished - 2008
Event13th European Conference on Composite Materials - Stockholm, Sweden
Duration: 2 Jun 20085 Jun 2008


Conference13th European Conference on Composite Materials
Internet address

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