Fatigue delamination propagation at high frequency of a CFRP UD material

During their service life aeronautical structures are submitted to vibrations due to aerodynamic turbulent flows around structure and engines. These fluid-structure interactions induce not only sonic acoustic fatigue spectra with low load amplitudes at high frequency range but also buffeting or flutter type fatigue with high loads at lower frequency range. The current static design of composite aircraft covers fatigue loading cases. But with the...