Abstract
In recent years, infrared thermography has been widely used in mechanical testing because of its non-contact, rapidity and high accuracy. In order to explore the advantages of infrared thermography in vibration fatigue monitoring of blade structures, the characterization of the vibration fatigue behavior of blade structures is carried out based on infrared thermography with the validation and assistance of laser vibrometry. Firstly, the numerical simulation and experimental analysis were used to determine the size and location of the maximum stress in blade structures. Afterwards, the linear relationship between the stress and amplitude(σν-A curve) of blade structures was calibrated by laser vibrometry, and thus the S-N curve was fitted. Eventually, the heat dissipation law and crack extension process for vibration fatigue of blade structures was analyzed by infrared thermography, and the fatigue limit of the blade structure was predicted by combining infrared thermography and the Luong bilinear method. It is shown that the heat dissipation law and crack extension process for vibration fatigue of blade structures can be effectively analyzed by infrared thermography. Infrared thermography saves some economic and time costs for fatigue limit prediction, and the method is within 2.6% of the results predicted by the Basquin model. This paper provides a certain reference basis for the research methodology for vibration fatigue behavior of blade structures.
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