13.4 Conclusion A hybrid method for digital image correlation of IR thermogram for deformation measurement of composites is presented. Through translation test, neighborhood averaging and frame averaging of the thermogram was found effective for image correlation, an average error of 0.6 pixels can be achieved from the tests. Form tensile testing, the loading was found decreased during the step heating period, however the applied load is almost the same. The displacement measured by IRT DIC compared fairly well to the ones by the ordinary DIC, but with relatively large standard deviation. Further study is required to improve the stability and accuracy of IRT DIC for practical use. Acknowledgement This work is supported by Ministry of Science and Technology, Republic of China, MOST103-2221-E-006-053. References 1. Vavilov, V., Maldague, X., Dufort, B., Robitaille, F., Picard, J.: Thermal nondestructive testing of carbon epoxy composites: detailed analysis and data processing. NDT&E Int. 26, 85–95 (1993) 2. Maldague, X.: Applications of infrared thermography in nondestructive evaluation. In: Trends in Optical Nondestructive Testing, pp. 591–609 (2000) 3. Montanini, R., Freni, F.: A new method for the determination of the coefficient of thermal expansion of solid. In: 11th International Conference on Quantitative InfraRed Thermography, Italy, pp. 11–14 (2012) 4. Chen, T.Y.-F., Lu, R.-S.: Development of a hybrid infrared image correlation technique to deformation measurement of composites. In: ATEM’15, Japan (2015) 5. Chen, T.Y., Kuo, M.-H.: Converting the infrared thermal image into temperature field for detection the defects inside materials. In: Eighth International Symposium on Precision Engineering Measurement and Instrumentation, Proceedings of SPIE, vol. 8759, 87594L (2013). doi:10.1117/12.2015771 13 Hybrid Infrared Image Correlation Technique to Deformation Measurement of Composites 119
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