Crack size monitoring in necked double shear lugs using the electro-mechanical impedance method
Sprache des Vortragstitels:
SPIE Smart Structures + NDE, Health Monitoring of Structural and Biological Systems XV, 2021
Sprache des Tagungstitel:
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.