Feasibility Study of Eddy Current Heating Thermography Non-Destructive Testing Method Under Varied Dimensions of Hidden Crack

This article presents a comprehensive analysis of the feasibility of using an axisymmetric magnetothermal model, solved through the finite element method (FEM), to detect hidden cracks in specimens. The study explores the impact of crack radius, crack depth, and sheet thickness as key parameters in the interaction between the specimen and electromagnetic stimulation. The analysis involves the use of a current-carrying coil to generate a magnetic field, inducing eddy currents in the specimen, subsequently leading to localized heating. Temperature distributions are examined to identify potential defects within the specimen. Mesh independency analysis is initially conducted to ensure the reliability of the results. The study finds that the FEM results remain consistent with varying mesh densities. Subsequent temperature analysis reveals that the presence of cracks significantly alters temperature distributions, with larger cracks causing more pronounced changes. The maximum temperature and temperature gradient are found to be promising indicators for crack detection. Furthermore, variations in crack depth and sheet thickness are analyzed, highlighting the influence of these parameters on the detection process. The study concludes that this non-destructive testing (NDT) method holds the potential for identifying defects in specimens of varying characteristics, providing valuable insights for quality control and structural integrity assessment.

کلیدواژه ها:

Non-destructive testing ، Eddy Current ، Inductive heating ، Sensors ، Cracks