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Inspection on SiC coated carbon–carbon composite with subsurface defects.pdf

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Inspection on SiC coated carbon–carbon composite with subsurface defects

Inspection on SiC coated carbon–carbon composite with subsurface defects using pulsed thermography Tang Qingju a,b,?, Liu Junyan a,?, Wang Yang a, Qi Litao b, Qin Lei a a School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, PR China b School of Mechanical Engineering, Hei Longjiang Institute of Science and Technology, Harbin 150022, PR China h i g h l i g h t s The heat transfer model has been built and solved. Experiments were performed on the built pulsed thermography system. SBIM, PPT and TtLFM algorithms are used to process the thermal wave signals. a r t i c l e i n f o Article history: Received 5 September 2012 Available online 16 May 2013 Keywords: Pulsed thermography Carbon–carbon composite Defects Infrared camera a b s t r a c t An investigation on SiC coated carbon–carbon (C/C) composite plates has been undertaken by pulsed thermography. The heat transfer model has been built and the finite element method (FEM) is applied to solve the thermal model. The simulation results show that defects with DA/DP smaller than one can hardly be detected by an infrared camera with the sensitivity of 0.02 C. Certificated experiments were performed on the built pulsed thermography system. The thermal wave signals have been processed by subtracting background image method (SBIM), pulsed phase thermography (PPT), and temperature– time logarithm fitting method (TtLFM). The limit DA/DP of defects in SiC coated C/C composite plates with the thickness of 6 mm that can be detected by pulsed thermography with the presented signal anal- ysis algorithms has been obtained. 2013 Elsevier B.V. All rights reserved. 1. Introduction In recent years, the study of SiC coated C/C composite materials has been of great interest owing to their widespread applications in thermal protection system. However, despite theoretical suppo- sition concerning their uniformity in structure and form, flawless manufacturing techniques are rarely achieved [1–3]. The del