Numerical Modelling and Analysis of Infrared Testing in Delaminations of Pressurepipes Using ANSYS

Numerical modeling of high temperature pressure pipes including delaminations were constructed using ANSYS, then heat flux and convection are loaded on the outside surface. The influence of pulse excitation parameters, depth of defects, thickness of defects, length of defects on maximum thermal contrast and time for maximum thermal contrast are analysised. Length of defects are measured by using the methed of full width at half maximum .According to the research result, it is known that the maximum thermal contrast increased linearly with the product of excitation time and heat flux. It increases also as the defect gets thicker and less deeper, but will not increase always as the length of defects increase. As to the time for maximum thermal contrast, it appears more later with longer excitation time, deeper and thicker defects, however, which has nothing to do with the heat flux. Full wide at half maximum is a good method to measure the length of defects for its small error.