63829 2025 eng 1 23 445 article Elsevier B.V. 1 -- -- -- This paper presents a numerical framework employing the Scaled Boundary Finite Element Method (SBFEM) for efficiently solving ultrasonic guided wave modal scattering problems and constructing scattering matrices (S-matrices). The framework integrates hierarchical octree meshing and an enhanced far field formulation. It incorporates boundary integrals, enabling an accurate representation of defect interactions with guided waves. Validation is performed using a benchmark test supported by an error estimation method based on energy balance. Two practical examples are used to showcase the simulation framework, where the scattering of guided waves with surface-breaking and subsurface cracks near rivet holes is studied. Computer Methods in Applied Mechanics and Engineering 10.1016/j.cma.2025.118204 0045-7825 urn:nbn:de:kobv:b43-638295 publish 11.08.2025 Creative Commons - CC BY - Namensnennung 4.0 International Daniel Lozano Hauke Gravenkamp Carolin Birk eng uncontrolled Guided waves eng uncontrolled Scattering matrix eng uncontrolled Scaled boundary finite element method eng uncontrolled Elastodynamics Sanitär- und Kommunaltechnik; Umwelttechnik 8 Zerstörungsfreie Prüfung 8.4 Akustische und elektromagnetische Verfahren Umwelt Datei für die Öffentlichkeit verfügbar ("Open Access") Graue Literatur Wissenschaftliche Artikel der BAM Bundesanstalt für Materialforschung und -prüfung (BAM) https://opus4.kobv.de/opus4-bam/files/63829/Lozano et al. - 2025 - Simulations of ultrasonic guided wave scattering u.pdf