Damage localization on CFRP composites by electrical impedance tomography

This work exploited the use of electrical impedance tomography (EIT) with one-step difference Gaussian-Newton (GN) algorithm to detect different types damage on unidirectional carbon fibre/epoxy composite laminates. The major challenge concerning implementation EIT materials has do their anisotropy. To assess this issue, study was conducted fibre composites having layup configurations degrees anisotropy: a quasi-isotropic layup, approximate as much possible these layered an isotropic material, and unbalanced further degree Damage detection in highly anisotropic laminates is for technique, which not been assessed before literature. Severe damage, form through-thickness holes, created diameters at two locations specimen evaluate sensitivity technique size its capacity multiple damages. showed progressive decrease conductivity diameter holes increased. Impact damages severities were also created. able distinguish shapes identified elongated shaped damages, produced by impact events energies, However, images overestimate damaged area, compared non-destructive ultrasonic inspections. revealed central area specimens, but well-defined shape could be distinguished.