Affiliations: School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, China
Correspondence:
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Corresponding author: Yihua Kang, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, Hubei, China. E-mail:yihuakang@mail.hust.edu.cn
Abstract: The micro-crack is always difficult to discover in the
widely applied magnetic flux leakage (MFL) inspection because of the weak
leakage magnetic field. Hence, a novel method for enhancing the micro-crack
signal based on the magnetic particle adsorption is proposed. The mechanism
of magnetic field distribution in the vicinity of the micro-crack based on
the new method is analyzed from the angle of magnetic refraction. The
confirmation for the signal enhancement and further discussion are presented
with the finite element simulation. Simulation results indicate that the
signal of the micro-crack is significantly enhanced based on the magnetic
particle adsorption which confirms the feasibility of the novel method. In
addition, the ability of the signal enhancement is more relevant to the
maximum height than the maximum width of the magnetic particle indication,
and the signal increases when the relative permeability of the gathered
magnetic particles is bigger.
Keywords: Magnetic flux leakage (MFL) inspection, magnetic particle testing (MT), micro-crack, signal enhancement
