62857 2024 eng lecture 0 -- -- -- Lamb waves, recognized for their significance in material characterisation, structural health monitoring, and non-destructive testing, exhibit complex behaviours that are crucial for industrial applications. This paper delves into the mathematical and physical principals of the repulsion effect that can be observed in the dispersion curves of coupled Lamb wave modes. This effect is the result from the mechanical coupling of thin-walled solid plates and prevents the crossing of the dispersion curves. The study employs the Scaled Boundary Finite Element Method to calculate the dispersion curves of coupled plates and to simulate their interaction for a weak and ideal coupling. Through a mathematical framework and a physical analogy with simple harmonic oscillators, the paper elucidates the underlying principals of this effect. Furthermore, the paper highlights the practical significance of the repulsion effect in Lamb waves, suggesting its application for testing and monitoring the integrity of multi-layer structures like adhesive bonds, which are important for various industrial applications. A deepened understanding of this effect could contribute to the enhancement of non-destructive evaluation techniques. ICSV 2024 Amsterdam, Netherlands 08.07.2024 11.07.2024 0 publish false true Marcel Nicolai eng uncontrolled Lamb waves eng uncontrolled Mode repulsion eng uncontrolled Scaled Boundary Finite Element Method (SBFEM) eng uncontrolled Mechanical coupling eng uncontrolled Dispersion curves Ingenieurwissenschaften und zugeordnete Tätigkeiten 8 Zerstörungsfreie Prüfung 8.4 Akustische und elektromagnetische Verfahren Material Degradationsmechanismen Datei im Netzwerk der BAM verfügbar ("Closed Access") Präsentation