Acoustic Fatigue Life of Adhesive Bonded Structures Subjected to Acoustic Loads,
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH
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Acoustic fatigue damage to riveted metallic structures in aircraft due to high intensity noise has been recognized as a problem and design criteria have been developed to prevent such damage. However, very little design criteria are available for bonded and composite structures subjected to high intensity noise. A summary of the work completed in acoustic fatigue prediction techniques for weldbonded aluminum, adhesive bonded aluminum and adhesive bonded graphite-epoxy structures is discussed. These structures are more complex than riveted structures, more difficult to analyze and exhibit many different modes of failure which require a more detailed study to predict the sonic fatigue lifetime. Adequate performance under static loading did not guarantee adequate performance under dynamic loading. Some prediction methods have been developed for certain failure modes in adhesive bonded aluminum and graphite-epoxy bonded skin-stiffened structures. Further investigations are needed to adequately predict the acoustic fatigue life of adhesive bonded and graphite-epoxy aircraft structures.