A novel approach for measuring of thickness of induction hardened layers based on the eddy current method and the finite element modeling

摘要

The thesis concerns applications of the Eddy Current (EC) for measurements of the thickness of the layers. Additionally, the special finite element models have been developed which simulate eddy currents in materials with surface layers. These models can be used for direct measurements of the thickness of the induction hardening layers in complex shape elements. The numerical models have been validated by the measurements carried out on specially designed test samples. The results obtained in the study allow for building-up the reference database for experimental measurements. They also provide tools for analyses of the eddy current impedance diagrams collected under variable probe parameters and for different properties of the layers and substrates.