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18 May 2012 C/C composite brake disk nondestructive evaluation by IR thermography
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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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Tsuchin P. Chu, Anish Poudel, and Peter Filip "C/C composite brake disk nondestructive evaluation by IR thermography", Proc. SPIE 8354, Thermosense: Thermal Infrared Applications XXXIV, 83540D (18 May 2012);

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