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Correlation of eddy current responses between fatigue cracks and electrical-discharge-machining notches

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Abstract

The eddy current responses of Electrical Discharge Machining (EDM) notches and fatigue cracks are directly compared to verify the reliability of eddy current inspection. The fatigue crack growth tests using a constant load range control mode were conducted to obtain a variety of edge crack sizes, ranging from 0.9 to 6.6 mm for Al alloy and from 0.1 to 3 mm for Ti alloy. EDM notch specimens of Al and Ti alloys were accordingly prepared in lengths similar to that of the fatigued specimen. The crack length was determined by optical microscope and scanning electron microscope. The eddy current responses between the EDM and fatigued specimens with varying notch/crack length were examined using probe sensors at (100-500) kHz and (1-2) MHz for Al and Ti alloys, respectively. The results show a significant difference in the eddy current signal between the two specimens, based on the correlation between the eddy current response and notch/crack length. This suggests that eddy current inspection using the EDM reference specimen is inaccurate in determining the precise crack size, unless the eddy current response data base is obtained from a fatigue-cracked specimen.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Chungnam National University, Daejeon, 34134, Republic of Korea

    Sukho Seo, Gyudong Choi & Soo Yeol Lee

  2. Aero Technology Research Institute, Daegu, 41052, Republic of Korea

    Tae Jhoun Eom & Bokwon Lee

Authors
  1. Sukho Seo
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  2. Gyudong Choi
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  3. Tae Jhoun Eom
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  4. Bokwon Lee
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  5. Soo Yeol Lee
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Correspondence to Soo Yeol Lee.

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Seo, S., Choi, G., Eom, T.J. et al. Correlation of eddy current responses between fatigue cracks and electrical-discharge-machining notches. Met. Mater. Int. 23, 756–763 (2017). https://doi.org/10.1007/s12540-017-6738-1

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  • DOI: https://doi.org/10.1007/s12540-017-6738-1

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