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http://dx.doi.org/10.7779/JKSNT.2012.32.6.686

Noncontact Fatigue Crack Evaluation Using Thermoelastic Images  

Kim, Ji-Min (Department of Civil and Environmental Engineering, KAIST)
An, Yun-Kyu (Department of Civil and Environmental Engineering, KAIST)
Sohn, Hoon (Department of Civil and Environmental Engineering, KAIST)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.32, no.6, 2012 , pp. 686-695 More about this Journal
Abstract
This paper proposes a noncontact thermography technique for fatigue crack evaluation under a cyclic tensile loading. The proposed technique identifies and localizes an invisible fatigue crack without scanning, thus making it possible to instantaneously evaluate an incipient fatigue crack. Based on a thermoelastic theory, a new fatigue crack evaluation algorithm is proposed for the fatigue crack-tip localization. The performance of the proposed algorithm is experimentally validated. To achieve this, the cyclic tensile loading is applied to a dog-bone shape aluminum specimen using a universal testing machine, and the corresponding thermal responses induced by thermoelastic effects are captured by an infrared camera. The test results confirm that the fatigue crack is well identified and localized by comparing with its microscopic images.
Keywords
Fatigue Crack Detection; Thermoelastic Effects; Nondestructive Evaluation; Noncontact Thermography;
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Times Cited By KSCI : 1  (Citation Analysis)
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