Rapid evaluation of fatigue limit on thermographic data analysis

•Three new methods are developed to determine fatigue limit with uniqueness.•Experimental thermographic data from literature are used to evaluate each method.•Numerical experiments are carried out to investigate stability of each method. Based on infrared thermography, the graphic methods such as Lu...

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Bibliographic Details
Published in:International journal of fatigue 2017-11, Vol.104, p.293-301
Main Authors: Huang, Jia, Pastor, Marie-Laetitia, Garnier, Christian, Gong, Xiaojing
Format: Article
Language:English
Subjects:
Data analysis
Engineering Sciences
Error analysis
Experiments
Fatigue limit
Graphical methods
Infrared analysis
Infrared thermography
Materials fatigue
Mechanics
Mechanics of materials
Self-heating
Stress state
Temperature
Thermography
Uniqueness
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Summary:•Three new methods are developed to determine fatigue limit with uniqueness.•Experimental thermographic data from literature are used to evaluate each method.•Numerical experiments are carried out to investigate stability of each method. Based on infrared thermography, the graphic methods such as Luong’s method and Risitano’s method are proved to be rapid and efficient for fatigue limit determination comparing to conventional methods. However, the determination procedure involves visual inspection so contains man-made uncertainties, which restricts their usage. In the present paper, we propose three new treatment methods in terms of relation curve between experimental temperature response (or dissipated energy) and the applied stress amplitude so as to determine the fatigue limit with uniqueness. Those three methods were all evaluated by applying to the experimental data from literature and the error of results were discussed and analyzed. In addition, numerical experiments were carried out to investigate the influence of loading stepped length and random error on each new treatment method.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2017.07.029