A novel magnetic flux leakage method based on the ferromagnetic lift-off layer with through groove

Tang, Jian; Wang, Rongbiao; Liu, Bocheng; Kang, Yihua

doi:10.1016/j.sna.2021.113091

Cited by 18 publications

(4 citation statements)

References 28 publications

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“…A leaked magnetic field diminishes finishing quality and wastes energy due to uneven magnetic field distribution and increased power consumption. However, overheated coils weaken the field, increases damage risk, and pose safety hazards due to excessive heat buildup in the coils, raising their resistance and leading to insulation breakdown and, short circuits leading to fire risk [161]. These issues can be addressed using optimized coil design, specialized core materials such as soft laminated iron, and shielding to confine the magnetic field to enhance the field strength and minimize flux leakage [50].…”

Section: Challenges In Advancing the Maf Process For Future Workmentioning

confidence: 99%

Recent advancements in magnetic abrasive finishing: a critical review

Kumar,

Komma

2024

Eng. Res. Express

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Many engineering applications require components with a good surface finish. It is difficult to get the surface finish in the micro/nano level range with conventional finishing processes for materials such as super alloys, composites, and ceramics. Magnetic abrasive finishing (MAF) is one of the processes for achieving superior surface finish. However, the processes efficiency is affected by its operational variables. Even a slight change in a processing parameter may lead to dimensional inaccuracies and poor surface quality of the workpiece. In this paper, recent trends in the magnetic abrasive finishing process are presented along with a critical review. The review includes MAF principles, tools, hybridization, modeling, and simulation of the process. Apart from plane MAF, the principle of MAF for cylindrical workpieces, the mechanism of material removal and the effect of different types of abrasives are also discussed. Various machine tools used for MAF of plane and cylindrical workpieces for external and internal surfaces are also discussed. In hybridization, different processes combined with MAF, like ultrasonic-assisted MAF, chemo-assisted MAF, and electrochemical-assisted MAF, etc., are discussed to increase material removal rate and obtain surface finish at the micro/nano level. The paper also covers mathematical and statistical modeling, simulation, and optimization techniques to predict and optimize the set of input process parameters. Lastly, challenges and conclusions of the MAF process are presented.

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Section: Challenges In Advancing the Maf Process For Future Workmentioning

confidence: 99%

Recent advancements in magnetic abrasive finishing: a critical review

Kumar,

Komma

2024

Eng. Res. Express

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“…D. Wu proposed to use two sensors to measure the change rate of magnetic flux leakage to reduce background and vibration noises [ 131 ]. J. Tang proposed to use a ferromagnetic material with grooves to replace the conventional non-ferromagnetic liftoff layer to increase the MFL signal [ 132 ]. T. Nara designed a Fourier coil consisting of two coils of radial offset [ 133 ].…”

Section: Excitation and Sensing Techniques In Mfl Testingmentioning

confidence: 99%

A Review of Magnetic Flux Leakage Nondestructive Testing

Feng

et al. 2022

Materials

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Magnetic flux leakage (MFL) testing is a widely used nondestructive testing (NDT) method for the inspection of ferromagnetic materials. This review paper presents the basic principles of MFL testing and summarizes the recent advances in MFL. An analytical expression for the leakage magnetic field based on the 3D magnetic dipole model is provided. Based on the model, the effects of defect size, defect orientation, and liftoff distance have been analyzed. Other influencing factors, such as magnetization strength, testing speed, surface roughness, and stress, have also been introduced. As the most important steps of MFL, the excitation method (a permanent magnet, DC, AC, pulsed) and sensing methods (Hall element, GMR, TMR, etc.), have been introduced in detail. Finally, the algorithms for the quantification of defects and the applications of MFL have been introduced.

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“…Zhang Runhua [20] proposed a method of addition of a shielding layer to the magnetic circuit to attenuate the background magnetic field near the rail surface, thus attenuating the interference of vibration. Tang Jian [21] et al proposed the use of a ferromagnetic material with high magnetic permeability as a lifting-off layer and opened a penetration slot to gather more magnetic flux leakage field. This indirectly amplified the magnetic flux leakage signal of the crack and improved the signal strength of the detection.…”

Section: Introductionmentioning

confidence: 99%

Magnetic flux leakage testing method for Ferromagnetic workpiece with rough surface based on the ferromagnetic lift-off layer

Yang

Qiu

Peng

et al. 2023

Preprint

Self Cite

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Conventional leakage detection studies usually consider the surface of the workpiece to be smooth by default. The lifting medium between the sensor and the workpiece is often a non-ferromagnetic material such as air; however, the surface roughness of the latter often affects the sensitivity of leakage detection in practical applications. To address these problems, this study proposed a magnetic leakage detection method based on the influence of surface roughness on the leakage field of surface cracks on the workpiece. The influence of the characteristic parameters of magnetic media on the leakage field signal of rough surface cracks was analyzed through simulations, and subsequently verified via experiments. The experimental results confirmed that the magnetic flux leakage detection method based on magnetic lift-off layer improved the signal-to-noise ratio (SNR) of the magnetic flux leakage signal of cracks on a rough workpiece surface. An increase in thickness (0.5 mm) and permeability of the magnetic media layer also improved the SNR (by 2.2 dB) of the magnetic flux leakage detection signal. Thus, the proposed method can improve the SNR of the leakage detection signal in general, which is expected to provide a certain reference value for leakage detection of rough surface workpieces.

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A novel magnetic flux leakage method based on the ferromagnetic lift-off layer with through groove

Cited by 18 publications

References 28 publications

Recent advancements in magnetic abrasive finishing: a critical review

Recent advancements in magnetic abrasive finishing: a critical review

A Review of Magnetic Flux Leakage Nondestructive Testing

Magnetic flux leakage testing method for Ferromagnetic workpiece with rough surface based on the ferromagnetic lift-off layer

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