Distinguishing Stress Concentration or Cracking in Ferromagnetic Material Using Abnormal Magnetic Signals

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  • Changliang Shi
    State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology Analytical and Testing Centre, Guangzhou Research Institute of Non-ferrous Metals
  • Peng He
    State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology
  • Shiyun Dong
    National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering
  • Binshi Xu
    National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering

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In the geomagnetic field, spontaneous magnetic signals in ferromagnetic materials can be induced by stress, which can be potentially applied to estimate the damage degree. In this research, a method of distinguishing stress concentration or cracking in ferromagnetic material was proposed. The normal component of magnetic field, Hp(y), was measured on the surfaces of ferromagnetic specimens with notch. The results indicated that the shapes of Hp(y) curves of stress concentration and cracking were different, there was abnormal magnetic peak in the Hp(y) curve of cracking. Meanwhile, the effect of lift-off on abnormal magnetic peak was studied, and the optimal lift-off value was also presented.

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