A dual-dipole model for stress concentration evaluation based on magnetic scalar potential analysis

Han, Gang; Huang, Haihong

doi:10.1016/j.ndteint.2020.102394

Cited by 14 publications

(4 citation statements)

References 44 publications

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“…Each specimen was subjected to uniaxial fatigue testing at a frequency of 10 Hz and with loads ranging from 50% to 85% of the Ultimate Tensile Strength (UTS) of API steel grade X65, which was obtained from the tensile testing, to ascertain how load variations affected the magnetic signals. The selection of the frequency value was based on the frequency used in previous studies that used the metal magnetic memory method during fatigue testing of metal materials [ 28 , 32 , 33 ]. In addition, Arifin et al found that the fatigue test was unstable when using a frequency of 20 Hz during testing [ 34 ].…”

Section: Methodsmentioning

confidence: 99%

Fatigue Life Assessment of API Steel Grade X65 Pipeline Using a Modified Basquin Parameter of the Magnetic Flux Leakage Signal

et al. 2023

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This paper presents a modified fatigue life model of the Basquin equation using the stress parameter of the magnetic flux leakage signal. Most pipeline steels experience cyclic loading during service and the influence of the load history makes assessing fatigue behaviour more difficult. The magnetic flux leakage signal’s response to a uniaxial cyclic test of API X65 steel was measured with eight levels of ultimate tensile stress loads. The influence of dH(y)/dx on fatigue failure was the main concern in this study, the aim being to represent localised stress parameters in the modified Basquin equation. Both fatigue lives, experimental and predicted from the modified Basquin equation, were validated through reliability analysis, producing a 60% value when approaching 1.8 × 105 cycles. The fatigue data from the experiment produced a higher mean-cycle-to-failure value than the prediction data, with slightly different values of 3.37 × 105 and 3.28 × 105. Additionally, the modified Basquin equation’s predicted and the experimental fatigue lives were found to have a high R2 correlation value of 0.9022. The Pearson correlation also showed a good relationship between the fatigue lives, with an r value of 0.9801. Finally, the modified Basquin equation based on dH(y)/dx signals provided an accurate and alternative method for durability assessment.

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Section: Methodsmentioning

confidence: 99%

Fatigue Life Assessment of API Steel Grade X65 Pipeline Using a Modified Basquin Parameter of the Magnetic Flux Leakage Signal

et al. 2023

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“…The right-angle coordinate system is transformed into a column coordinate system. The formula for the hyperbola on the xoy plane is y 2 /a 2 − x 2 /b 2 = 1, and the parametric coordinates of the hyperbola are x = btanθ, y = asecθ; the magnetic charge area differential element ds = dldu, where dl can be expressed by Equation (11). Then, the integral expression of the leakage magnetic field signal in the form of the hyperbola cracked hole is obtained, as shown in Equation (16).…”

Section: Double-curve-shaped Crack Hole Defectmentioning

confidence: 99%

“…Okolo et al, simulated the distribution characteristics of surface and far-field leakage fields using axial magnetization technology and detected and characterized the leakage distribution caused by surface and far-field hairline cracks on rectangular specimens [9]. Leng and Han separately established magnetic dipole integral models to describe the leakage fields generated by the plastic zone at the tip of a V-shaped notch in ferromagnetic materials due to dislocation accumulation and magnetic dipole models to evaluate the stress concentration caused by local plastic deformation [10,11]. Wu et al, analyzed the variation in surface magnetic charge density for defects in different directions and effectively described the directional influence of defects on the distribution of leakage magnetic field [12,13].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Charge Model for Leakage Signals from Surface Defects in Ferromagnetic Material

Sheng

Zhang

et al. 2023

Materials

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A novel three-dimensional theoretical model of magnetic flux leakage (MFL) is proposed in this paper based on the magnetic dipole model. The magnetic dipole model assumes that a ferromagnetic specimen with defects is exposed to a uniform external magnetic field that causes a uniform magnetization around the defect surface. Under this assumption, the MFL can be regarded as arising from magnetic charges on the defect surface. Previous theoretical models were mostly used to analyze simple crack defects such as cylindrical and rectangular cracks. In this paper, we developed a magnetic dipole model for more complex defect shapes such as circular truncated holes, conical holes, elliptical holes, and double-curve-shaped crack holes to complement the existing defect shapes. Experimental results and comparisons with previous models demonstrate that the proposed model provides a better approximation of complex defect shapes.

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“…Residual stress and hidden damage generated in the production and manufacturing process will lead to its failure or even fracture under long-term fatigue damage. Serious or even catastrophic accidents will seriously threaten people's property and life safety [2][3], so it is particularly important to assess the damage of ferromagnetic specimens in the early stage [4]. Metal magnetic memory detection technology was first proposed by Professor DOUBOV in 1994 [5][6].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Dipole Model and Experimental Analysis of Magnetic Signal Detection Based on Magnetic Memory

Lu,

Ren,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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By assuming that the magnetic charge is evenly distributed in the defect groove, the linear magnetic dipole is integrated in the depth direction of the defect, and the numerical calculation is carried out by using MATLAB to establish a two-dimensional magnetic dipole theoretical analysis model of double-correlated defects, which is suitable for analyzing the influence of stress on magnetic signal in the magnetic memory detection of rectangular and V-shaped combined macroscopic crack defects. To explore the influence factors and change rules of magnetic memory signal. In order to verify the correctness of the model analysis results, tensile tests were carried out on Q235 steel plate with double associated defects with different morphological characteristics, and the Hp(y) value of the normal component of the leakage magnetic field on the surface of the member was measured. The results show that the model based on magnetic dipole theory can explain some experimental phenomena and rules in magnetic memory detection.

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A dual-dipole model for stress concentration evaluation based on magnetic scalar potential analysis

Cited by 14 publications

References 44 publications

Fatigue Life Assessment of API Steel Grade X65 Pipeline Using a Modified Basquin Parameter of the Magnetic Flux Leakage Signal

Fatigue Life Assessment of API Steel Grade X65 Pipeline Using a Modified Basquin Parameter of the Magnetic Flux Leakage Signal

Magnetic Charge Model for Leakage Signals from Surface Defects in Ferromagnetic Material

Magnetic Dipole Model and Experimental Analysis of Magnetic Signal Detection Based on Magnetic Memory

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