The magnetic force on a spherical magnetic particle in the leakage field of a surface-breaking slot

Magnetic particle testing is based on the magnetic mark of magnetic particle formation on the workpiece surface by magnetic leakage field to reflect the characteristics of workpiece defects. The formation of magnetic leakage field, the impact factors and the distribution characteristics of different defects are discussed. The methods of magnetic mark record are elaborated. The magnetic marks related display characteristics of various types of defects caused, the magnetic marks unrelated display characteristics of the various types of non-defects caused, the pseudo display characteristics are analyzed in detail. Finally the recognition methods of magnetic mark display are given.

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Study of the leakage field of magnetic force microscopy thin-film tips using electron holography

NDT & E International ◽

10.1016/s0963-8695(98)90451-0 ◽

1998 ◽

Vol 31 (2) ◽

pp. 131

Keyword(s):

Thin Film ◽

Magnetic Force Microscopy ◽

Magnetic Force ◽

Electron Holography ◽

Force Microscopy ◽

Leakage Field

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Study of the leakage field of magnetic force microscopy thin‐film tips using electron holography

Applied Physics Letters ◽

10.1063/1.116039 ◽

1996 ◽

Vol 68 (13) ◽

pp. 1865-1867 ◽

Cited By ~ 14

Author(s):

B. G. Frost ◽

N. F. van Hulst ◽

E. Lunedei ◽

G. Matteucci ◽

E. Rikkers

Keyword(s):

Thin Film ◽

Magnetic Force Microscopy ◽

Magnetic Force ◽

Electron Holography ◽

Force Microscopy ◽

Leakage Field

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Mechanism of a Magnetic Field Assisted Finishing Process Using a Magnet Tool and Magnetic Particles

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.339.106 ◽

2007 ◽

Vol 339 ◽

pp. 106-113 ◽

Cited By ~ 4

Author(s):

Yan Hua Zou ◽

Takeo Shinmura

Keyword(s):

Magnetic Field ◽

Magnetic Particles ◽

Magnetic Force ◽

Magnetic Particle ◽

Machining Process ◽

Finishing Process ◽

Magnet Surface ◽

Magnetic Abrasives ◽

Quality Surface ◽

Process Method

This paper describes a new efficient internal finishing process for a thick tubing (10~30mm in thickness), by the application of a magnetic field-assisted machining process using a magnet tool. Because a stronger magnetic force can be generated than conventional magnetic abrasives, it makes the internal finishing of thick non-ferromagnetic tubing possible. Moreover, in order to obtain a high-quality surface, this process method was developed using magnetic particles magnetically attracted on the magnet surface. This paper characterizes the processing principle and advantages of this process. Then, the mechanism of this finishing process was examined by a plane model experiment. It was clarified that the magnetism and shape of a magnetic particle influence realization possibility of this processing method, and it also influence the finishing characteristics.

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Importance of Basset History Force for the Description of Magnetically Driven Motion of Magnetic Particles in Air

Measurement Science Review ◽

10.2478/msr-2020-0007 ◽

2020 ◽

Vol 20 (2) ◽

pp. 50-58 ◽

Cited By ~ 1

Author(s):

Andrej Krafcik ◽

Peter Babinec ◽

Melania Babincova ◽

Ivan Frollo

Keyword(s):

Magnetic Field ◽

Magnetic Particles ◽

Magnetic Force ◽

Magnetic Particle ◽

Homogeneous Magnetic Field ◽

Gradient Magnetic Field ◽

Driven Systems ◽

Long Time ◽

History Force ◽

Stokes Force

AbstractLungs are used as an attractive possibility for administration of different therapeutic substances for a long time. An innovative method of such administration widely studied nowadays is the application of aerosolized magnetic particles as the carriers to the lungs in the external non-homogeneous magnetic field. For these reasons we have studied dynamics of such a system on a level of particle trajectory in air in the presence of magnetic force as a driving force exerted on micrometric magnetic particle. On two typical examples of magnetically driven systems—motion of magnetic particle in a gradient magnetic field and cyclotron-like motion of a charged particle in homogeneous magnetic field in microscale, where the external accelerating forces are very large and the relevant time scale is of the order from fraction of milliseconds to seconds, we have examined the importance of these forces. As has been shown, for particles with high initial acceleration, not only the commonly used Stokes force but also the Basset history force should be used for correct description of the motion.

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