FMLs are hybrid materials having exceptional fatigue and damage tolerance properties. Presence of fibres in FMLs plays an important role in reducing the phenomena like plasticity and related crack growth retardation. Similar behaviour is observed during flight spectrum tests performed on FMLs. The following conclusions are based on the performed tests and their correlation with predictions. GLARE has clearly better fatigue crack growth properties than ARALL in all the cases i.e., different truncation, mean stress and ground stress levels. Furthermore, in some tests GLARE has shown better fatigue crack growth resistance than GLARE 2, which is due to the poststretching Similar to monolithic metals, the truncation level, changes in mean stress and ground stress levels have a strong influence on the crack growth rate. However, the effect in FMLs is smaller than observed in monolithic metals. This effect even decreases with the increase in crack length. The fatigue crack growth prediction model is applicable to both ARALL and GLARE laminates. However, for ARALL 2 fibre failure was not taken into account in the prediction model, which resulted in a mismatch between test and prediction. Fatigue crack growth predictions for ARALL 3 were quite accurate because of the absence of fibre failure due to post-stretching. Similar to selective VA loading, fatigue crack growth predictions made with the VA model for flight spectrum loading, correlate well with the test data. Due to the intact fibres in the wake of the crack, the truncation effect and the effect of mean stress is less pronounced in FMLs. For this reason, the yield zone model, which produces erroneous predictions for metals predicts quite well in this case.
Fatigue performance of fibre metal laminates under flight loading spectra
2009
10 Seiten, 9 Bilder, 2 Tabellen, 18 Quellen
Conference paper
English
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