Determination of mechanical properties of metal of welded joints by strength parameters in the stress concentration zones detected by the metal magnetic memory method

Kolokolnikov, Sergey; Dubov, Alexander; Marchenkov, A. Yu.

doi:10.1007/s40194-014-0151-x

Cited by 18 publications

(6 citation statements)

References 1 publication

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“…This method is an online detection technology for pipeline stress concentration [14][15][16]. Given that the mechanism of the magnetic effect of stress has not been clarified, the qualitative and quantitative relationship between stress and weak magnetic field signal has always been a hot research topic [17][18][19][20]. The generation mechanism of weak magnetic signal under stress has been examined from different perspectives, but still no unified theory can explain all the phenomena of stress-magnetic coupling [21][22][23][24][25].…”

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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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: 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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“…Xihua et al proposed a weak magnetic stress internal detection technology for online stress detection and risk assessment of oil and gas pipelines [ 29 ]. In addition, relevant scholars have established and applied magnetomechanical models of different structures by using the theories and techniques of electromagnetism, magnetism, and magnetoelasticity [ 30 , 31 , 32 , 33 ]. Overall, in the fields of magnetic properties and nondestructive testing, scholars have carried out some research on the theory of magnetic sensors and damage detection methods for steel bridges, building structures, and pipelines.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Stress Sensing System for Nondestructive Stress Testing of Structural Steel and Steel Truss Components Based on Existing Magnetism

Weng

Wang

Yang

et al. 2020

Sensors

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To detect the stress of steel structures and members using the existing magnetism, a magnetic stress sensing system integrating a magnetic flux induction coil, a magnetic flux measurement device, a loaded device, and data acquisition software was developed. The magnetic coupling test research was carried out for different grades of structural building and bridge steel specimens to establish the magnetic stress flux mathematical model, and the fitting equation of the magnetic flux changes with the positions of different sections of specimens was analyzed. Furthermore, a practical formula for stress detection was obtained through the experiments. Meanwhile, on these bases, the typical steel truss structure model of a Bailey beam was designed and manufactured under different working conditions, nondestructive online stress testing was carried out, and the stress of the model structure and its members was measured by strain and magnetic flux tests to obtain the curves of the test results for the stress–strain and magnetic stress flux, respectively. The results of these two methods are in good agreement with each other. The stress of the steel truss model structure was analyzed and calculated using the finite element method. The results agreed well with the experimental results from the magnetic stress sensing system—the maximum error was about 5%, which meets the requirements of engineering applications.

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“…Scholars have carried out related research work on the theory and application of the magnetic coupling effect [26,27].…”

Section: Introductionmentioning

confidence: 99%

Stress Testing of Steel Suspender of Arch Bridge Model Based on Induced Magnetic Flux Method

Weng

Yang

Zhu

2020

Advances in Materials Science and Engineering

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To establish an online nondestructive stress testing method for arch bridge suspender based on the principle of magnetic coupling, the magnetic mechanical property of Q345qD steel is explored taking an arch bridge model structure with Q345qD steel suspender as the research object. Under the action of magnetic field excited by a coil, the test of the coupling relationship between stress and excitation flux is carried out. The theoretical model of stress-magnetic flux is simplified to better meet the requirements of engineering applications. The excitation device, magnetic flux measurement device, stress-magnetic flux data analysis program, and so on are developed, and the magnetic coupling stress detection system is integrated. The test model structure of a steel arch bridge with suspenders of Q345qD alloy steel is designed and made; under the different load conditions, the stresses of the suspenders are tested and studied. The relationships between induced magnetic flux and technical magnetized voltage, test load of model structure, and different stress conditions of the suspenders are analyzed; with the induction magnetic flux as the parameter, the stress-magnetic flux coupling model is established. The test results based on the stress-magnetic flux coupling model are compared with those of the traditional stress-strain test in a linear elastic range; it shows that the two testing methods are in good agreement with each other, and the maximum error is less than 5%. Meanwhile, with the increase in the load on the suspender, the tension stress increases and the induced magnetic flux decreases, showing a good linear relationship. The conclusions drawn from the research can provide important reference for health monitoring of suspenders of arch bridges.

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Determination of mechanical properties of metal of welded joints by strength parameters in the stress concentration zones detected by the metal magnetic memory method

Cited by 18 publications

References 1 publication

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 Stress Sensing System for Nondestructive Stress Testing of Structural Steel and Steel Truss Components Based on Existing Magnetism

Stress Testing of Steel Suspender of Arch Bridge Model Based on Induced Magnetic Flux Method

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