13th International Conference on Fracture June 16–21, 2013, Beijing, China -6- [2] All the three fatigue damage indicators can describe the fatigue damage process. The macro-phenomenon and internal microstructure evolution are associated by the energy theory. [3] The low errors of the predicted fatigue limits demonstrate the reliability of the infrared thermographic method in predicting fatigue parameters of materials and components. [4] It is a fast and accurate technique for fatigue evaluation using various damage indicators resorting to the infrared technique. Consequently, the method may be used to identify the fatigue damage status of structures in service in the future. Acknowledgements The financial supports of Natural Science Foundation of China (No.11072045) and National Basic Research Program of China (No.2011CB706504) are gratefully acknowledged. References [1] W.Fricke, Fatigue analysis of welded joints: state of development. Mar.Struct.16 (2003) 185-200. [2] V.Crupi, E.Guglielmino, M.Maestro, et al., Fatigue analysis of butt welded AH36 steel joints: Thermographic Method and design S–N curve. Mar. Struct. 22 (2009) 373-386. [3] G.La Rosa, A.Risitano, Thermographic methodology for rapid determination of the fatigue limit of materials and mechanical components. Int. J. Fatigue, 22 (2000) 65-73. [4] G.Fargione, A.Geraci, G.La Rosa, A.Risitano, Rapid determination of the fatigue curve by the thermographic method. Int. J. Fatigue, 24 (2002) 11-19. [5] J. Nowacki, Weldability of 17-4 PH stainless steel in centrifugal compressor impeller applications. Process Tech. 157-158(2004) 578-583. [6]M.I. Khan, M.L. Kuntz, and E. Biro, Y.Zhou, Microstructure and Mechanical Properties of Resistance Spot Welded Advanced High Strength Steels. Mater. Trans. 49 (2008) 1629-1637. [7]J.L.Fan, X.L.Guo, C.W.Wu, et al, Effect of Heat Treatments on Fatigue Properties of FV520B Steel Using Infrared Thermography. Chin. J. Mater. Res. 26(2012), 61-67. [8]T. Boulanger, A. Chrysochoos, C. Mabru, et al, Calorimetric analysis of dissipative and thermoelastic effects associated with the fatigue behavior of steels.: Int. J. Fatigue. 26(2004) 221-229. [9]J.L. Fan, X.L. Guo, C.W. Wu, et al, Research on fatigue evaluation and fatigue fracture mechanism of cruciform welded joints. Mater. Sci. & Eng. A. 528(2011) 8417-8427. [10]J.Fan, X. Guo, C.Wu, A new application of the infrared thermography for fatigue evaluation and damage assessment. Int. J. Fatigue. 44(2012) 1-7. [11]F. Curà, G. Curti, R. Sesana, A new iteration method for the thermographic determination of fatigue limit in steels. Int. J. Fatigue. 27(2005) 453-459.
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