Markus Winklberger,1 Christoph Kralovec,1 Peter Heftberger,2 Martin Schagerl1,3
1Johannes Kepler Univ. Linz (Austria) 2RO-RA Aviation Systems GmbH (Austria) 3Christian Doppler Lab. for Structural Strength Control of Lightweight Constructions, Johannes Kepler Univ. Linz (Austria)
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Artificially introduced cracks in necked double shear lugs are monitored using piezoelectric transducers attached to the lug shaft and analyzed by the electro-mechanical impedance (EMI) method with a model-based approach. Numerical simulations with coupled-field finite element (FE) models are used to study the frequency response behavior of necked lugs. Through-cracks with lengths up to 3 mm are located at 90° to the lug axis, which is a critical spot for damage initiation. The shift of a selected resonance frequencies found by analytical and numerical calculations are used to estimate the crack length. Results of numerical FE simulations are validated with multiple experimental measurements .
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Markus Winklberger, Christoph Kralovec, Peter Heftberger, Martin Schagerl, "Crack size monitoring in necked double shear lugs using the electro-mechanical impedance method," Proc. SPIE 11593, Health Monitoring of Structural and Biological Systems XV, 115930B (22 March 2021); https://doi.org/10.1117/12.2583208