Acoustic Fatigue Endurance Test of SPF-Db Titanium Coupon Specimens and Panel Structure

IN I FDDUCI IG JAcoustic fatigue failures have occurred in structures lying close to.or in the path of.the jet efflux.Similar failures have occurred in other regions of pressure fluctuation such as within the intake duct of fan engines, and in regions of separated flow near control surfaces.such as elevators.aps.rudders, or items in the proximity of jet engine noise source such as spoilers which are used on aircraft during manoeuvres.With the development of advanced composite and metallic structures for use in aircraft airframes.the understanding of the behaviour.the acoustic characteristics and the related damage tolerance of these materials becomes very important.