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Model-based Evaluation of Electro-mechanical Impedance Measurements for Detection and Size Identification of Face Layer Debondings in Sandwich Panels

CHRISTOPH KRALOVEC, MARTIN SCHAGERL, THOMAS ERLINGER

Abstract


The present work investigates, based on simple beam models, the well-established vibration based electro-mechanical impedance method as a potential Structural Health Monitoring (SHM) method for the monitoring of debonding in sandwich structures. The Finite Element Method (FEM) is used to analyze the response of a simple beam on different linear and non-linear elastic foundations, representing a sandwich face layer debonding, to a harmonic excitation. First, a finite element based approach to study nonlinear steady-state vibrations of structures is developed and discussed by analytical considerations. Consecutively, the numerically calculated structural responses are presented in detail and their non-linear features are revealed. Finally, the model based findings are discussed regarding their potential to help monitoring damages like, e.g., sandwich face layer debonding that provoke a non-linear response to a harmonic excitation and a short outlook of related future research is given.

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