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Experiment Study on Stress-Magnetization Effect of Metal Magnetic Memory Method Testing Technique

Author: PanQiangHua
Tutor: RenJiLin
School: Nanchang University of Aeronautics and
Course: Measuring Technology and Instruments
Keywords: Magnetic Memory Testing Magnetic domain structure Magnetic suspension Force magnetic effect
CLC: TG115.284
Type: Master's thesis
Year: 2010
Downloads: 152
Quote: 1
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Abstract


The MMM testing technology is based on the force of the ferromagnetic material - magnetic effect (ferromagnetic material under stress caused by the phenomenon of magnetic properties change), change the upload ferromagnetic component surface leakage magnetic field measurements, the measured evaluation of the dangerous position of the object on the stress concentration zone is characterized by a new non-destructive testing methods, can effectively prevent the metal structures due to the early damage caused by the sudden failure failure failure occurred. MMM testing mechanism is still perfect, paper-based magnetic ferromagnetic, physics, theoretical analysis and experimental research methods exploratory study of the microscopic mechanism of magnetic memory testing technology. Firstly, according to the the ferromagnetic, magnetostratigraphy physics theory to the energy of the ferromagnetic system based on combined micromechanics upload ferromagnetic mechanical components injury research, according to the energy minimum theorem, according to the one-dimensional Landau-Lifshitz equation export under stress magnetic domains and magnetic domain walls change equations and numerical simulation. Obtained under no external stress or the outer magnetic field environment, the small rule of the moving speed of magnetic domain walls. Then, 20 # steel, 45 # steel and silicon steel sheet as the research object, the stress field of finite element simulation by ANSYS software to determine the specimen surface magnetic field measuring line, static tensile loading of the sample with a central circular hole defects tensile specimens before and after the measurement of the surface magnetic field values ??of different stress on the specimen surface leakage magnetic field. The results showed that: a smaller load, the specimen surface leakage magnetic field changes, but modest leakage magnetic field and the surface clutter. The specimen is in the stage of plastic deformation, according to the principle of minimum energy, with increasing degree of stress concentration, the defective parts of the surface leakage magnetic field changes, as the load increases, the amount of changes in the strength of the magnetic induction ΔB change also increases, and defective parts The K value of the leakage magnetic field gradient curve peak showed obvious fluctuation characteristics. The focus of the paper is homemade excellent performance the micromagnetic suspension, and Bitter powder pattern method to observe changes in the organizational structure of the magnetic domains of the loaded specimen analysis. Triggered by ferromagnetic materials under load stress concentration area organization directed and irreversible magnetic domain reorientation of ferromagnetic materials in magnetic domain reorientation of the organization arranged under stress magnetic domain node is bound to appear in the stress concentration zone , as well as the change of stress state and the organizational structure of magnetic domains corresponding relationship and the law as explained by the carrier ferromagnetic materials produce microscopic physical nature of the magnetic memory effect provides the strongest evidence.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Analytical tests of the metal (Metal Testing and Materials ) > Physical test method > NDT > Magnetic flaw detection
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