Modeling of Pulsed Thermography in Anisotropic Media
NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
Pagination or Media Count:
A simple thermographic model has been developed that accurately describes the surface temperature response of an aluminum panel with flat bottom holes of different depths and diameters to a short heat pulse. This model assumed that a thin layer of material at the surface is instantaneously heated by the pulse, and that subsequent cooling of the surface is due to diffusion of the deposited energy into the bulk of the material. The model accounts for sample thickness, density, specific heat, in-plane and out-of-plane thermal conductivity and defect size and depth. However, heat pulse parameters such as pulse duration and intensity were not included. In this talk we will present experimental and modeling results on graphite epoxy composites with flat bottom holes of different radii and depth. The experimental results were collected with standard pulse thermographic equipment. The experimental data was analyzed with our model. The effects of anisotropy in the thermal conductivity will be presented and discussed.