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Structural Engineering and Mechanics Volume 44, Number 4, November25 2012, pages 417-429 DOI: http://dx.doi.org/10.12989/sem.2012.44.4.417 |
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Fatigue performance assessment of welded joints using the infrared thermography | ||
J.L. Fan, X.L. Guo and C.W. Wu
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| Abstract [Full Text] | ||
| Taking the superficial temperature increment as the major fatigue damage indicator, the infrared thermography was used to predict fatigue parameters (fatigue strength and S-N curve) of welded joints subjected to fatigue loading with a high mean stress, showing good predictions. The fatigue damage status, related to safety evaluation, was tightly correlated with the temperature field evolution of the hotspot zone on the specimen surface. An energetic damage model, based on the energy accumulation, was developed to evaluate the residual fatigue life of the welded specimens undergoing cyclic loading, and a good agreement was presented. It is concluded that the infrared thermography can not only well predict the fatigue behavior of welded joints, but also can play an important role in health detection of structures subjected to mechanical loading. | ||
| Key Words | ||
| fatigue performance; welded joint; infrared thermography; energetic damage model; residual fatigue life | ||
| Address | ||
| J.L. Fan: State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China; School of Mechanical Engineering, Department of Mechanical Engineering, Purdue University, West Lafayette, IN 47906, USA X.L. Guo and C.W. Wu: State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China | ||