This paper discusses the non-destructive evaluation of thick Carbon/Carbon (C/C) composite aircraft brake disks by
using transient infrared thermography (IRT) approach. Thermal diffusivity measurement technique was applied to
identify the subsurface anomalies in thick C/C brake disks. In addition, finite element analysis (FEA) modeling tool was
used to determine the transient thermal response of the C/C disks that were subjected to flash heating. For this, series of
finite element models were built and thermal responses with various thermal diffusivities subjected to different heating
conditions were investigated. Experiments were conducted to verify the models by using custom built in-house IRT
system and commercial turnkey system. The analysis and experimental results showed good correlation between thermal
diffusivity value and anomalies within the disk. It was demonstrated that the step-heating transient thermal approach
could be effectively applied to obtain the whole field thermal diffusivity value of C/C composites.
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