Our research works employ preferentially Acousto-Ultrasonic (AU)[1-2] guided waves to detect the global effects of fatigue loading adhesive joints by analysing the patterns of the guided wave propagation in lap samples. The relationships between ultrasonic wave modes and distinct damaged lap joint model were evaluated by finite difference method algorithm. In the experimental section of our study, guided waves were used to monitor quasi-static and fatigue damage development in the bonded lap joints. The characteristics of the numerical signal associated with the interaction of waves and fatigue damage were continuously monitored during fatigue loading of bonded specimens. The mechanical degradation of the lap joints with respect to their fatigue life was monitored by evolution of the signal behaviour and the mode wave's propagation in the adhesive lap joints. The experimental results demonstrate that by exploring the propagation of guided waves combined with an advanced signal processing offer an efficient methodology to evaluate the state of health of bond joining structures undergoing internal damage due to fatigue loading
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