Damage Evaluation Using Magnetic Properties in Stainless Steels under Biaxial Stress

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  • Shimamoto Akira
    High-Tech Research Center, Saitama Institute of Technology
  • Ohkawara Hiroshi
    High-Tech Research Center, Saitama Institute of Technology
  • Yang Sung-mo
    Div. of Mechanical & Advanced Material Eng., Chonbuk National University
  • Choi Dae-kue
    Div. of Mechanical & Advanced Material Eng., Chonbuk National University
  • Akamatsu Satoshi
    Dept. Tech. & Innovation Section, Denshijiki Industry Co., LTD.

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Various stainless steels were investigated to examine the new NDE technique. The new NDE technique did not depend on either magnetization or demagnetization of materials. The magnetic flux caused by stress concentration in stainless steels was examined with the ultra sensitive magnetic flux density meter. Tensile and biaxial fatigue tests were conducted to observe the magnetic flux leakage. Results from biaxial fatigue tests indicated that the measured magnetic flux curves had local periodical cycles with global increasing tendencies. The defect evaluation would be possible by comparing the flux density value at the stress concentration regions with that of other areas.

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