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Fatigue is a key factor for durable designs of composite
structures. Delamination is the most important damage mechanisms
for these materials. In many composite components delaminations
grow under a varying mode mix that depends on the crack length. It
is important to develop methods that can characterise subcritical,
mixed-mode growth in fatigue delamination. The objective of this
investigation is the characterisation of variable mixed-mode
fatigue delamination in composite laminates. A mixed-mode fatigue
delamination model is proposed. Opposite to literature mixed-mode
fatigue delamination models, the proposed model assumes a
non-monotonic variation of the propagation parameters with the mode
mix. The mixed-mode end load split (MMELS) test, in which the
propagation mode varies with the crack extent, is analysed. Two
theoretical approaches present in the literature are considered.
However, the resulting expressions are not equivalent and a more
accurate alternative analysis is carried out based on the virtual
crack closure technique. Significant findings are found for
materials characterisation.
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