A method for identifying geometrical defects and stress concentration zones in MMM technique

Sun, Le; Liu, Xin'en; Niu, Hongpan

doi:10.1016/j.ndteint.2019.102133

Cited by 13 publications

(3 citation statements)

References 15 publications

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“…The linear combination coefficient can be obtained from Eigenequation (10), and then the wave function of the system can be obtained using Equation (7). Then, the electron spin density of states and energy band structure of the solid system can be calculated by substituting Equation ( 7) into Equation (6). The tight binding method has the advantage that the calculation is relatively small, but only considers the changes of the electronic states of the outer s-orbitals of atoms.…”

Section: Theoretical Calculation Methods Of Stress Weak Magnetic Signalmentioning

confidence: 99%

“…Inversely, the plastic deformation can be determined by detecting the stress concentration. Magnetic memory testing can characterize the stress concentration degree of the ferromagnetic material by detecting the irreversible magnetic field change characteristics on the material surface after the stress application in the geomagnetic environment [6][7][8][9]. On the basis of magnetic memory, weak magnetic detection is proposed to assess the stress concentration degree by detecting the weak magnetic field signal distribution and variation characteristics on the pipeline surface under the non-excitation state (earth magnetic field environment) [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Weak Magnetic Signal Characteristics for Critical Damage of Oil and Gas Pipelines Based on Electron Spinning

Wang¹,

Mao²,

Du³

2021

IEEE Access

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Stress and deformation are important factors that affect the safe operation of pipelines. Plastic deformation in the pipeline indicates a state of critical damage. Based on micro-magnetization and stress equivalent magnetic field theories, the change mechanism of ferromagnetic materials under external stress is analyzed. The 3D simulation model of the iron-carbon alloy system is established by the Material Studied software, and the relationship between the system magnetism and stress is obtained by calculating the electronic spin state distribution changes under different stress applications. The pipeline suppression experiment is designed to study the change characteristics of the magnetic induction intensity on the pipeline surface during the repeated suppressions until yield. Results show that the weak magnetic signal continuously varies as the pressure on the pipeline increases. The greater the pressure, the lower the magnetic induction intensity on the pipe surface. The pipeline exhibits different weak magnetic signal characteristics in the elastic and plastic deformation stages. The magnetic signal variation curve has apparent inflection points. The deformation and damage states of the pipeline can be assessed by the change characteristics of the weak magnetic signal. Repeated suppression causes the pipeline magnetism to weaken and the initial magnetization of the material to decrease. The experimental results are consistent with the theoretical analysis.INDEX TERMS Critical damage, electron spinning, equivalent magnetic field, weak magnetic.

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Section: Theoretical Calculation Methods Of Stress Weak Magnetic Signalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Weak Magnetic Signal Characteristics for Critical Damage of Oil and Gas Pipelines Based on Electron Spinning

Wang¹,

Mao²,

Du³

2021

IEEE Access

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“…Non-destructive testing (NDT) methods are applied for stress status evaluation to determine the durability and service life of components in a highly developed modern industry [6,7]. Among them, magnetic Barkhausen noise (MBN) is a magnetic NDT technique which quickly obtains information regarding both the microstructure and stress state for ferromagnetic materials [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Barkhausen Noise Transient Analysis for Microstructure Evolution Characterization with Tensile Stress in Elastic and Plastic Status

Liu

Tian

Gao

et al. 2021

Sensors

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Stress affects the microstructure of the material to influence the durability and service life of the components. However, the previous work of stress measurement lacks quantification of the different variations in time and spatial features of micromagnetic properties affected by stress in elastic and plastic ranges, as well as the evolution of microstructure. In this paper, microstructure evolution under stress in elastic and plastic ranges is evaluated by magnetic Barkhausen noise (MBN) transient analysis. Based on a J-A model, the duration and the intensity are the eigenvalues for MBN transient analysis to quantify transient size and number of Barkhausen events under stress. With the observation of domain wall (DW) distribution and microstructure, the correlation between material microstructure and MBN transient eigenvalues is investigated to verify the ability of material status evaluation on the microscopic scale of the method. The results show that the duration and the intensity have different change trends in elastic and plastic ranges. The eigenvalue fusion of the duration and intensity distinguishes the change in microstructure under the stress in elastic and plastic deformation. The appearance of grain boundary (GB) migration and dislocation under the stress in the plastic range makes the duration and the intensity higher on the GB than those inside the grain. Besides, the reproducibility of the proposed method is investigated by evaluating microstructure evolution for silicon steel sheet and Q235 steel sheet. The proposed method investigates the correlation between the microstructure and transient micromagnetic properties, which has the potential for stress evaluation in elastic and plastic ranges for industrial materials.

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Research on Corrosion Circumferential Area Characterization for Steel Cable Bundle Based on Metal Magnetic Memory

Zhou

Xia

Zhou

et al. 2022

J. of Materi Eng and Perform

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A method for identifying geometrical defects and stress concentration zones in MMM technique

Cited by 13 publications

References 15 publications

Weak Magnetic Signal Characteristics for Critical Damage of Oil and Gas Pipelines Based on Electron Spinning

Weak Magnetic Signal Characteristics for Critical Damage of Oil and Gas Pipelines Based on Electron Spinning

Magnetic Barkhausen Noise Transient Analysis for Microstructure Evolution Characterization with Tensile Stress in Elastic and Plastic Status

Research on Corrosion Circumferential Area Characterization for Steel Cable Bundle Based on Metal Magnetic Memory

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