Evaluation of spatial strain distributions by thin elastoresistive sensors using 2D Electrical Impedance Tomography
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Structural Health Monitoring (SHM) is believed to reduce uncertainties in the operation of mechanical structures, and thus, increase safety. Strain measurements are often used to conclude on the health state of a structure of interest. In combination with elastoresistive materials, Electrical Impedance Tomography (EIT) can be used to monitor larger areas of safety relevant structural components for strain changes that might indicate damage. The present research investigates the evaluation of spatial strain distributions by elastoresistive thin-film sensors using 2D Electrical Impedance Tomography. Therefore, spatially-limited strains and the subsequent conductivity changes in a thin-film surface sensor are numerically modelled and experimentally realized. Subsequently, the inverse reconstruction of both, simulated and experimental measurements by the Electrical Impedance Tomography are compared and analyzed with respect to the imaging of strain location, shape, extent and value.