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A study of using the thermography testing techniques to inspect defects of CFRP Structure
|關鍵字:||熱影像檢測;thermography testing;脈衝波熱源;梯波熱源;複材結構;蜂巢結構;pulse heating;step heating;CFRP;Honeycomb||出版社:||機械工程學系所||引用:||E.Grinzato, V.A.M. Luprano, S. Marinetti, P.G. Bison, R. Trentin, 2005, Thermal NdE of FRP applied to civil structures, CNR-ITC c.so Stati uniti,4-35127 Padua, Italy W. Swiderski, D. Szabra, M. Szudrowicz, 2008, Nondestructive Test of composite armours by using IR thermographic method, 9thinternational Conference on Quantitative Infrared Thermography. July 2-5, 2008, Krakow – Poland Tsuchin Philip Chu, 2009,Introduction to Nondestructive Testing, Professor of the Department of Mechanical Engineering and Energy Processes at Southern Illinois University Carbondale. X.Maldague, 2002, Introduction to NDT by Active Infrared Thermography, Electrical and Computing Engineering DepartmentUniversité Laval. Peter A.A.M. Somers and Hedser van Brug, 2005, Temporal phase unwrapping in a real-time phase stepped shearing speckle interferometer: a comparison of algorithms. Optics Research Group, Delft University of Technology the Netherlands Ching-Tang Liu, Min-Jui Huang, Yicheng Peter Pan, Daniel Shedlock, Tsuchin Philip Chu,2012, Detection of defects in Carbon composites using X-ray Compton Backscatter Radiography: Radiography by Selective Detection,Materials Evaluation, 70, 3, pp.367. P. Servais, N. Gerlach, 2006, Development of a NDT method using thermography for composite material inspection on aircraft using military thermal imager, ISBN 2-9809199-0-X. ViorelAnghel,NicolaeConstanitin, Mircea Gavan, Stefan SOROHAN, 2009, Some Applications of Thermography in NDE of Structure, SISOM 2009 and Session of the Commission of Acoustics, Bucharest 28-29 May V. P. VAVILOV, 2007, Pulsed thermal NDT of materials: back to the basics, Nondestructive Testing and EvaluationVol. 22, Nos. 2–3, June–September 2007, 177–197. S.G, Pickering, D.P Almond, 2009, Matched Excitation Energy Comparsion of the pulse and Lock-In Thermography NDE Techniques,CP1096 Review Quantitative Nondestructive Evaluation Vol. 28. Bradley G. Bainbridge, 2010, Optimization of Transient Thermography Inspection of Carbon Fiber Reinforced Plastics, Department of Mechanical Engineering and Energy Processes in the Graduate School Southern Illinois University at Carbondale. F.de Monte, 1999, Transient heat conduction in one-dimension composite slab. A ‘natural’ analytic approach, International Journal of heat and Mass Transfer 43(2000) 3607-3619. M. Necati Qzisik, 1985, Heat Transfer A Basic Approach, ISN 0-07-047982-8 Sergio Marinetti, Alberto Muscio, Paolo G. Bison and Ermanno G. Grinzato, "Modeling of thermal nondestructive evaluation techniques for composite materials", Proc. SPIE 4020, 164 (2000); Xinyu Fan, Ignaas VERPOEST and Dirk Vandepit,2006, Finite Element Analysis of Out-of-planeCompressive Properties ofThermoplastic Honeycomb, Journal of Sandwich Structuresand Materials, Vol. 8—September 2006 437. P. Innocenti and F. Scarpa, 2009, Thermal Conductivity Properties and Heat Transfer Analysis of Multi-re-entrant Auxetic Honeycomb Structures, Journal of COMPOSITE MATERIALS, Vol. 43, No. 21/2009. Viorel Anghel, Nicolae Constantinetc, 2010, Application of Infrared Thermography in NDE of Sandwich Composite Structures, SISOM 2010 and Session of the Commission of Acoustics, Bucharest 27-28 May. A318/A319/A320/A321 2008/08/01, Nondestructive Testing Manual Part 10 Thermographic ALI NO. 55-20-07. Boeing Nondestructive Test 200/12/05, Part 9 thermography Inspection for Ice or water in honeycomb Parts. Ronald F. Gibson 1994, Principles of Composite Material Mechanics, ISBN 0-07-113335-6 Infrared spectrum.gif From Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/File:Infrared_spectrum.gif#file||摘要:||
在檢測能力，經由測試驗證結果確認自行開發之熱影像檢測儀器，對較淺層(小於2.0 mm)複材結構瑕疵，部分試片瑕疵面積為3 × 3mm2仍可以有效辨識，立體層次較深層與尺寸較小之瑕疵則無法有效辨識。
For researching the thermography testing technology used to detect the defects of composite material structure, this study developed a set of thermal testing equipment which is low-cost and efficient for using to detect the defects in composite material structural of aircraft. In order to simplify the testing instruments, easy to carry and to provide efficiency heating source, the pulse heating and the step heating method were chosen as an active heat source in our developing test system. First at all, This research used the finite element method to calculate the impact on the thermal conductivity of the composite structure with flaw, which result in the temperature difference between the defective area and normal area, and then to estimate the flux and time of exposure of heating and infrared camera performance of resolution and wavelength. This result is valuable information for designing the specimen and experimental method.
For verification the performance of development thermography testing equipment, this research used standard composite material specimen with artificial defects for evaluation. In the same time, these specimens were evaluated by other non-destructive testing laboratories. The test results verified that developed thermography testing equipment has the same performance of other test lab’s thermography equipment. In addition, this research also refer to the different non-destructive testing methods results, such as air-coupled ultrasound, Back reflective X-Ray, to compare the inspection capability among these methods.
Test results were confirmed that defects, in shallower position (less than 2.0 mm) and the minimum area 3x3 mm2, can be effectively identified by developed thermography testing equipment. The defects, in structure deeper zone and smaller dimension, can not be identified. The drawback of this system which is only showed the defects on two-dimensional. It does not identify effectively the flaw for depth location and precise position in space, so the defects in deeper space need using other non-destructive testing methods to inspect. Also, the uniformity of heat source and surface of specimen affect inspecting capability of thermography testing equipment.
In addition, developed thermography testing equipment was used to detect the composite material structure which is a thin laminated construction of unmanned aircraft control surfaces. The test result shows the defects of adhesive bounding problem can be identified effectively. This thermography testing equipment has advantage of easy to operate, rapid detection and on-side supporting test, which can save measurement time and enhance the efficiency.
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