Stress Monitoring in Steel Elements via Detection of AC Magnetic Permeability Changes

Szumiata, T.; Hibner, K.; Dziewiecki, K.; Mazur, Z.; Gockiewicz, A.; Gzik-Szumiata, M.; Górka, B.; Witoś, Mirosław

doi:10.12693/aphyspola.133.719

Cited by 4 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This paper mainly studies the change of eddy current effect in the process of stress structure and strain of steel structure and reflects the specific state of strain through the induced electrical signal, to prevent sudden failure of steel [4]. When the steel structure is subject to stress and strain, its conductivity and magnetic conductivity will change due to changes in the crystal structure and crystal gap inside the material [5], thus changing the distribution of the eddy current field in the measured conductor, and ultimately leading to the change of the induced electrical signal generated by the eddy current field [6][7][8]. Therefore, the following theoretical analysis is made on the influence of stress and strain on the induced electrical signal and the conductivity and permeability of the measured conductor:…”

Section: Strain Detection Principle Of Eddy Current Effectmentioning

confidence: 99%

Real‐Time Strain Detection Technology for Steel Structures Based on Eddy Current Effect

Jin

Zheng

et al. 2023

Journal of Sensors

View full text Add to dashboard Cite

To avoid strains in steel structures in special equipment caused by excessive alternating loads, which cause stress concentrations in local areas and reduce the strength and pressure-bearing capacity of the steel structures, a method for evaluating the strain state of the steel structures using the eddy current effect is proposed, and the relevant testing device is developed. The RMS voltage and tension values were tested and fitted linearly with sampling time, and their linear correlations after fitting were 0.9978560 and 0.9967905, respectively. To investigate the method’s practical application, the effect of strain on the impedance of the eddy current probe was first studied theoretically, followed by the design and fabrication of a strain detection device comprised of an eddy current probe and a signal processing system. Finally, tensile strain experiments were carried out on 5 mm thick standard Q235 steel tensile specimens using a universal tensile machine and the linear equation of RMS voltage versus strain was obtained analytically. Theoretical and experimental tests have shown that the device can detect each strain stage and quantify the strain within the elastic stage by fitting a linear equation.

show abstract

Section: Strain Detection Principle Of Eddy Current Effectmentioning

confidence: 99%

Real‐Time Strain Detection Technology for Steel Structures Based on Eddy Current Effect

Jin

Zheng

et al. 2023

Journal of Sensors

View full text Add to dashboard Cite

show abstract

“…The stress dependence of the magnetic permeability can be described theoretically with the extension of the model presented in [13]. In this previous "one domain" approach, the domain wall motion was considered exclusively via an effective, modified magnetocrystalline anisotropy energy constant.…”

Section: Introductionmentioning

confidence: 99%

The Two-Domain Model Utilizing the Effective Pinning Energy for Modeling the Strain-Dependent Magnetic Permeability in Anisotropic Grain-Oriented Electrical Steels

Szumiata,

Rekas,

Gzik-Szumiata

et al. 2024

Materials

View full text Add to dashboard Cite

This paper presents a newly proposed domain wall energy-based model of the 2D strain dependence of relative magnetic permeability in highly grain-oriented anisotropic electrical steels. The model was verified utilizing grain-oriented M120-27s electrical steel sheet samples with magnetic characteristics measured by an automated experimental setup with a magnetic yoke. The model’s parameters, identified in the differential evolution-based optimization process, enable a better understanding of the interaction between stress-induced anisotropy and magnetocrystalline anisotropy in electrical steels. Moreover, the consequences of the simplified description of grain-oriented magnetocrystalline anisotropy are clearly visible, which opens up the possibility for further research to improve this description.

show abstract

“…Widely used effects in NDT are Joule effect, Villari effect, Wiedemann effect, Matteucci effect, Barret effect and Nagaoka-Honda effect [19][20][21][22][23]. The Barkhausen effect [24][25][26][27] is also used besides the mentioned effects.…”

Section: Introductionmentioning

confidence: 99%

Low-Frequency Magnetic Fields in Diagnostics of Low-Speed Electrical and Mechanical Systems

et al. 2021

View full text Add to dashboard Cite

The magnetic field created by technical devices is a source of information. This information could be used in contactless diagnostics and predictive maintenance or for resolving problems along with standard NDT (nondestructive testing) methods, especially if we consider large, slow-speed devices, such as electromotors, transmissions, or generators. Identification of causalities of device failure processes with near magnetic field is one of the suitable NDT methods improving sustainability of systems. The measurements presented in the article were performed with the VEMA 04 fluxgate vector magnetometer with the DC-250 Hz bandwidth and 2 nT sensitivity. Postprocessing of the results was performed in the means of standard methods of discrete Fourier Transform, spectrogram creation and Wavelet Transform. The article presents data gathered during the measurement of a pair of extraction fans with power of 140 kW each and maximum revolutions up to 740 rev/min controlled by frequency converters and a single semi-Kaplan water power plant with 400 kW peak power at 1005 rev/min maximum generator speed. The measurements were performed before and after repairs of one of the ventilators in the ventilation system at 60% and 100% of maximal output power. The rotating magnetic fields of the fan electromotor stator, fan rotor revolutions, rotor slip frequency and ball-bearing frequencies were identified in frequency spectrums in the distance of 700 mm from fan electromotor axis in both cases. During the measurements on the semi-Kaplan turbine, the changes in states of mechanical and electrical components of the machine were monitored in the magnetic fields with increase of the power in the range of 0–95%, before and after phasing to the electrical grid. Standard processing methods, Discrete Fourier Transform, spectrograms and Discrete Wavelet Transform were used. In the spectrograms of the measured magnetic fields, the 1st–4th harmonics of the turbine shaft, generator shaft and also their side frequencies were identified. Significant changes of magnetic fields in time were identified in the area of 60–95% power. With the help of the Wavelet, transform intervals were identified where it is desirable to operate the turbine. The analyses of magnetic fields measurements performed on the power plant were compared with vibro-diagnostic principles.

show abstract

Stress Monitoring in Steel Elements via Detection of AC Magnetic Permeability Changes

Cited by 4 publications

References 10 publications

Real‐Time Strain Detection Technology for Steel Structures Based on Eddy Current Effect

Real‐Time Strain Detection Technology for Steel Structures Based on Eddy Current Effect

The Two-Domain Model Utilizing the Effective Pinning Energy for Modeling the Strain-Dependent Magnetic Permeability in Anisotropic Grain-Oriented Electrical Steels

Low-Frequency Magnetic Fields in Diagnostics of Low-Speed Electrical and Mechanical Systems

Contact Info

Product

Resources

About