Nondestructive Testing of Polymer Composites with a Honeycomb Filler Based on the Root Mean Square Temperature Deviatiosn Recorded in the Process of Active Thermography

Polymer composites and composites including nanoscale structural elements in particular are being increasingly applied in various fields of industry. One of the actively developing types of such materials is composites with a honeycomb filler. The specifics of applying these materials requires monitoring and defect detection. However, it is complicated by their anisotropy and significant heterogeneity. The work describes a method of nondestructive testing based on active scanning thermography with a linear heat source, which is suitable for the detection of subsurface defects in nanocomposites with a honeycomb filler. Experiments on model samples with artificially introduced defects are carried out. Mathematical methods and algorithms for defect identification on the basis of thermogram data are developed. Some sources of noise and errors are identified, and measures to reduce their impact are proposed.