The characterization of Mode I delamination failure in non-woven, multidirectional laminates

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Abstract

The Mode I delamination failure of fibre-reinforced epoxy laminates was characterized using the uniform double cantilever beam test specimen and scanning electron microscopy. Generally, this failure appeared in a variety of forms, depending on ply orientation, test-specimen geometry and matrix toughness. The calculated fracture energy heavily depended on the fracture surface morphology. By defining interlaminar fracture strictly as an interlaminar separation including no fibre breakage, pull-out, etc, a material property independent of test-specimen geometry and orientation of the plies constituting the delaminating interface was elucidated. Since this quantity dissipated the least amount of energy possible during crack growth, it is the controlling factor for laminate toughness.

Original languageEnglish
Pages (from-to)277-290
Number of pages14
JournalComposites
Volume15
Issue number4
DOIs
StatePublished - Oct 1984
Externally publishedYes

Keywords

  • Mode I fracture energy
  • composite materials
  • delamination
  • matrix toughness
  • ply orientation

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