Solution of Transient Temperature Field for Thermographic NDT Under Joule Effect Heating

Abstract

Conducting infrared thermographic nondestructive testing (NDT) by the internal heat generated by Joule effect of components is a new heating approach for flaw detection. Due to the combination of electric field and thermal field, the irregular geometric boundary and the complicated internal heat source distribution, the theoretical solution of transient temperature field is very difficult. Nowadays numerical solution by FEM and FDM is mainly applied. By adopting certain assumptions, this paper presents a method to obtain the approximate temperature field by using Green’s function, and gives the solution of a two-dimensional rectangular field including a circular flaw. By contrast, the result tallies with the FEM results well.

Multi-physics damage sensing in nano-engineered structural composites

“…Among existing damage detection methods, infrared thermography, based on heat transmission within the structure, is a promising technology. The infrared thermography technique works with the widest variety of structural materials, including advanced composites that require more refined inspection and hold interpretation challenges relative to metals [13,14]. A recent study indicates that thermography is advantageous in terms of resolution over all other structural inspection techniques for advanced composites [15].…”