Characterizing Fatigue Delamination Growth in Multidirectional CFRP Laminates
Davide Biagini (TU Delft - Aerospace Engineering)
Francisco Monticeli (TU Delft - Aerospace Engineering)
Yasmine Mosleh (TU Delft - Civil Engineering & Geosciences)
John Alan Pascoe (TU Delft - Aerospace Engineering)
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Abstract
Despite the popularity of multidirectional laminates in many fatigue-prone design applications, there is still little understanding of how the adjacent plies’ fibre orientation affects interfacial crack (delamination) fatigue propagation. To expand our knowledge on this matter, we present a systematic experimental investigation of the delamination growth behaviour for different interfaces and under different opening modes. In mode I, off-axis plies (as in 90//0 and 45//0 interfaces) increase the effects of fibre bridging, shifting the Paris curves to higher strain energy release rates (SERR), and thus making the 0//0 results (highly) conservative. Instead, in the presence of mixed mode, the Paris curves of 0//0 interfaces were not conservative in case of low SERR and low crack growth rates. These effects need to be accounted for when predicting the fatigue behaviour of a multidirectional laminate.
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