Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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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)
  • Received : 2012.11.07
  • Accepted : 2012.12.12
  • Published : 2012.12.30
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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.

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References

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