Modeling of Pulsed Thermography in Anisotropic Media
Abstract
Thermography is increasingly being used as an quantitative NDE tool to detect damage in materials. Most of the theoretical analysis performed on thermographic data involves the use of one dimensional models or finite element analysis. This is due to the inability to account for lateral heat effects in an analytical fashion. Three simple models have been developed that to a first order approximation describes the main features of thermal pulse analysis when applied to a planar flaws. The last and most general of the models introduced takes into account lateral heat conduction effects, anisotropic thermal conductivity, thickness effects, flaw size effects, density effects, material properties and pulse duration. The model correctly predicts the relationships between the previous parameters. Equations 4, 5, and 6 are the main output of the second model. These relations were shown to model correctly the time dependence of the thermal contrast, the peak thermal contrast, and the time at which the thermal contrast peaks.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 20, 1999
- Accession Number
- ADA368628
Entities
People
- Ignacio Perez
- Paul Kulowitch
- Steven Shepard
Organizations
- Naval Air Warfare Center