Combining shell elements and transient spectral finite elements for guided wave propagation problems in deformed thin structures
Résumé
In leading edge industrial applications, assessing structure integrity is an important aspect of safety requirements. Structural Health Monitoring (SHM) proposes to use sensors and signal processing units in situ for such purpose. Ultrasonic SHM systems are already implemented in industry but their usage are limited due to environmental and operational conditions [1], such as internal stresses due to structural loading/deformation. We present a model, and corresponding numerical methods, for elastic wave propagation in a predeformed medium. We use a shell formulation [2] for nonlinear mechanics to compute the effects of structure loading. The computed displacement is fed into a spectral elements method [3] (SFEM) kernel to solve the time-domain linearized elastodynamics problem representing the wave propagation.
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