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A multi-frequency eddy current inversion method for characterizing conductivity gradients on water jet peened components |
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| Authors: | Veeraraghavan Sundararaghavan Krishnan Balasubramaniam Nimmagadda Ramesh Babu Nataraja Rajesh |
| Affiliation: | aDepartment of Mechanical Engineering, Center for NDE, Indian Institute of Technology—Madras, 301, Machine Design Section, Chennai 600036, India;bManufacturing Engineering Section, Department of Mechanical Engineering, Indian Institute of Technology—Madras, Chennai 600036, India |
| Abstract: | This paper describes a multi-frequency eddy current inversion procedure for characterizing specimens that are water jet peened. Multi-frequency inductance data was obtained by using well-characterized eddy current probes. The inversion uses a multi-layer axisymmetric finite element model as the forward model and the conductivity of each layer is found through interpolation of the inductance–conductivity data generated by the forward model. Skin depth approximation was used to isolate the integral effects of the conductivity variation on the inductance signal. Inverted conductivity profiles of the water jet peened specimens was found to resemble the predicted profiles. Information regarding the shape of residual stress gradients and relative intensities of peening were inferred from the conductivity profiles. |
| Keywords: | Multi-frequency eddy current testing Inverse model Water jet peening Conductivity gradient measurements |
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