An Inverse Method for Experimental Determination of Temperature Dependent Thermal Conductivities and Specific Heat of Orthotropic Materials

Abstract

This paper presents an original flash method for the simultaneous experimental identification of all thermophysical properties of orthotropic materials. The identification of these properties is based on the temperature measurement by infrared thermography on rear face of the test coupon submitted to a non uniform heating of front face by a laser source previously characterized by inverse heat conduction method. The post-processing of the unsteady measurements is done by an optimization algorithm using a direct thermal conduction model in order to identify the material specific heat and thermal conductivities along the three principal directions. The test coupon is placed inside a vacuum chamber to avoid convection heat exchanges, the chamber temperature can be controlled in the range 0