20.500.12556/RUL-189537 Full-field full-stress-tensor identification of base-excited structures Identifying the full-stress tensor over the surface of a vibrating structure is essential for design validation and vibration-fatigue-life estimation, yet current experimental methods provide only pointwise or incomplete stress data. Infrared cameras can provide non-contact, full-field surface-stress measurements on vibrating structures via the thermoelastic effect; however, they measure only the first stress invariant (i.e., the sum of the normal stresses at the free surface: σ$_{xx}$ + σ$_{yy}$). The individual stress components (σ$_{xx}$, σ$_{yy}$, τ$_{xy}$) required for a complete characterisation of the surface-stress state remain inaccessible from a single thermoelastic measurement. This article introduces a method that recovers the full-field, in-plane-stress power spectral density (PSD) field from thermoelastic camera data on a base-excited structure, demonstrated for thin, isotropic, metallic, plate-like structures under adiabatic conditions. First, a characterisation measurement identifies the hybrid stress-mode shapes containing all the plane-stress components by merging thermoelastic camera data with a simplified FE model through SEMM. Then, during operation under broadband random base excitation, the camera response is projected onto these mode shapes and expanded to the full-stress-tensor PSD. The method is validated experimentally on a clamped aluminium plate, identifying spatially resolved stress PSDs for all three in-plane components (σ$_{xx}$, σ$_{yy}$, τ$_{xy}$). The full-field first invariant σ$_{xx}$ + σ$_{yy}$ is measured experimentally; the individual components σ$_{xx}$, σ$_{yy}$ and τ$_{xy}$ are reconstructed through an experimentally corrected modal expansion informed by an FE stress basis, which supplies the inter-component ratios. thermoelastic stress analysis power spectral density multiaxial vibration fatigue SEMM modal expansion infrared camera termoelastična analiza napetosti spektralna gostota moči večosno vibracijsko utrujanje SEMM modalna ekspanzija infrardeča kamera true false true Angleški jezik Slovenski jezik Članek v reviji 2026-10-08 14:25:40 2026-10-08 14:25:45 2026-10-09 04:07:59 0000-00-00 00:00:00 2026 0 0 24 str. Vol. 259, art. 114786 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 534:620.178.3 0888-3270 10.1016/j.ymssp.2026.114786 294297603 Sonc_..._Full-field_.....pdf Sonc_..._Full-field_.....pdf 1 2D1F9BF9E8E3749F0E9C8F4EE5EDB772 7fa68519bd61fdf0263ef8dc0a965ea106e9fc52560764658666aea2a348fb7c 9720fc0b-c313-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=250175 https://www.sciencedirect.com/science/article/pii/S088832702600943X 1 3db5da7d-c313-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=250174 Fakulteta za strojništvo 0 0 0