This paper presents progress on the characterization of discontinuities in multilayer fastener sites using bolt hole eddy current (BHEC) techniques with model-based inversion. Improvement to the inversion process have been made, however, some model discrepancy remains resulting in greater inversion error for smaller corner discontinuities. Sensitivity to probe liftoff and the calibration process was also observed during experimental testing, indicating the need to estimate and compensate for varying probe state and certain adjacent material conditions.
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