Correlation between Compression Performance and Fiber Waviness in Composite Materials
Tutor / director / evaluatorGREENHALGH, EMILE
Document typeMaster thesis (pre-Bologna period)
Rights accessRestricted access - confidentiality agreement
Compression failure of composites is often the critical design driver of composite structures. In particular it is known that the presence of bre waviness whitin a laminate can considerable reduce the compression performance. Studies are conducted for crossply laminates varying degrees of ply waviness. Waviness is assumed to be in the direction of the 0° ply. Sites of wrinkling are localized using non-destructive (ultrasonic) inspection methods. Compression test specimens are frabicated from laminates, containing arti cially induced waviness. Compression strength and fracture mechanisms are investigated using digital speckle photogrammetry. A nite element model is developed to predict the regions with stress concentration and the strain eld in the wrinkling area. It is demonstrated the in uence of bre waviness on the compression strength.
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