Analysis of Damage Propagation in Single Lap Joints in Impact Fatigue

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Repetitive low-velocity impact loading can result in substantial damage in adhesively bonded joints after few impacts with low force levels compared to other types of loading. The main aim of this paper is to investigate the behavior of adhesive joints subjected to impact fatigue (IF) and standard fatigue (SF) as well as their combinations and compare their effect on damage in single lap joints (SLJs). Damage evolution in both SF and IF regimes is analyzed in terms of the deterioration of residual strength of joints after respective loading histories. Fractography analysis is implemented to correlate the residual stiffness reduction under IF and SF loading with the crack propagation behavior of SLJs.